I spend this website many hours each week to share my knowledge and experience from the areas of Astronomy, Cars and Travels. Most pages are written in English that is not my own native language, so do not judge me too hard if you find grammatical errors and more.

Highlights!

(these pages could be a mix of Swedish and English)

Contents:

• NewsHighlights on Astrofriend's homepage, see also left column Latest News
• New linksInteresting information NEW March 2023 !
• Must do stuffWhat makes your life valuable NEW March 2023 !
• Speech nature science, Föredrag naturvetenskap(most speeches in Swedish)

News:

Here I have collected news I found interesting.

Technology, Astronomy, Cars, Travels etc.

March 24, 2023 Astronomy: Astronomy Project

• Now when I almost finished the mechanical construction of my push pull screw focuser I must plan for the stepper motor controller. I need a hardware driver and control logic that can use INDI drivers:

  astronomy/ projects/ project-motor-focus-driver/ 01-project-motor-focus-driver.html
  (Project: Stepper motor driver)

Update:
Prototype setup, page 4
Purchasing needed components, page 3

Other astronomy projects:

March 17, 2023 Astronomy, double star

Meet my three new friends up on the night sky:

Chi Draconis, Cor Caroli and Grumium are double stars:

• astronomy/ astronomy-photo/ double-stars/ chi-draconis/ chi-draconis.html
  (Chi Draconis, spectroscopic double star)
• astronomy/ astronomy-photo/ double-stars/ cor-caroli/ cor-caroli.html
  (Cor Caroli, binary double star)
• astronomy/ astronomy-photo/ double-stars/ grumium/ grumium.html
  (Grumium, binary double star)

Other double stars:

March 15, 2023 Cars, Chrysler Crossfire wheels angles:

• With my DIY toe-in tool I measure my toe-in angles:

  vehicles/ my-cars/ chrysler-crossfire/ wheels-tires/ wheels-tires-01.html
  (Toe-in measurement, page 3-4)

  Update:
  Adjustment of the Toe-in angle, page 4 bottom

Other DIY repair tips for Chrysler Crossfire (Mercedes):

March 12, 2023 Astronomy: Tutorial

• Long time since I wrote something about Gimp, I still practicing. The latest is how to correct for bad flat calibrated images or even them without flat calibration images. I have also updated the older pages where I have found some mistakes:

  astronomy/ tutorials/ tutorial-gimp-astrophotography/ 01-tutorial-gimp-astrophotography-introduction.html
  (How to use Gimp for editing astrophotos)

Update:
Added alternative with color calibration in Siril, page 0.3 bottom

Other astronomy tutorials:

March 12, 2023 Travel Europe

• After our exiting travel in Northern Germany by train last year we are now drawing new plans for a travel in Southern Germany:

  travel/ europe/ germany-southern-2023/ 01-germany-southern.html
  (Southern Germany by train, 2023)

Other travels in Europe:

March 10, 2023 Astronomy, planetary nebula and global cluster

My Pentax 645 300 mm f/4 lens closing in to perfection. What happens when I try to photograph small planetary nebulas or small globular clusters ? Objects that's normally taken with at least three times longer focal lengths:

The planetary nebula M57:

• astronomy/ astronomy-photo/ planetary-nebulas/ m57/ m57-planetary-nebula.html
  (M57)

The global cluster M92:

• astronomy/ astronomy-photo/ globular-clusters/ m92/ m92-globular-cluster.html
  (M92)

astronomy/ astronomy-photo/ open-clusters/ astronomy-photo-planetary-nebulas.html Other planetary nebulas.

astronomy/ astronomy-photo/ globular-clusters/ astronomy-photo-globular-clusters.html Other global clusters photos.

March 9, 2023 Astronomy: Project

• This time I take a look at the focus and the temperature, how long time does it take to stabilize ?

  astronomy/ projects/project-pentax645-300ed/ 01-pentax645-300ed.html
  (Pentax 645 300 mm f/4 ED lens)

Update:
Auto focus during a session, page 15
Focus and temperature, page 15

Other astronomy projects:

March 4, 2023 Astronomy, open cluster

This night wasn't good enough weather to take the car out to a dark place. I did this observation from our balcony instead. When astrophotographing from the balcony it's easier if the objects bright, stars are easier than deep sky object. I found that I had the open cluster NGC 6939 coming up from North:

The open cluster NGC 6939:

• astronomy/ astronomy-photo/ open-clusters/ ngc6939/ ngc6939-open-cluster.html
  (NGC 6939)

astronomy/ astronomy-photo/ open-clusters/ astronomy-photo-open-clusters.html Other open clusters photos.

February 28, 2023 Cars, Chrysler Crossfire radio:

• My car is 17 years old and still have the original radio installed. Good sound but it doesn't have Bluetooth or USB connector. Now it's time to replace it with something more modern. I have started to investigate how the booster amplifier is connected:

  vehicles/ my-cars/ chrysler-crossfire/ radio-replace/ 01-radio-replace.html
  (Radio and booster replacement)

Update:
Installation of new radio
Investigating adapter cables

Other DIY repair tips for Chrysler Crossfire (Mercedes):

February 27, 2023 Astronomy: Tutorial

My Canon 6D has always been very slow with download image files from the camera to the astroserver. This is more an investigating if there is someway to come around this. Asking at forums now and collecting information:

• astronomy/ tutorials/ tutorial-canon6d-data-transfer/ 01-tutorial-canon6d-data-transfer.html
  (Canon slow data transfer)

Update:
Testing different setups of INDI DSLR driver

Other astronomy tutorials:

February 19, 2023 Astronomy, galaxy

One hour drive out to a dark place this evening. Clear sky, no Moon, perfect for deep sky objects. The objects I choose were the galaxies the M81 & M82. I can't reach them from our balcony so felt this will be exiting:

The galaxies M81 & M82:

• astronomy/ astronomy-photo/ galaxies/ m81/ m81-m82-galaxies.html
  (M81 & M82)

astronomy/ astronomy-photo/ comets/ astronomy-photo-galaxies.html Other galaxy photos.

February 19, 2023 Astronomy, asteroid

At one night with clear night I found that I have an asteroid in the view from the balcony, Ceres. This was the first asteroid to be found and that already 1801. Today it belongs to the group Dwarf planets:

The asteroid Ceres:

• astronomy/ astronomy-photo/ asteroids/ ceres/ ceres.html
  (Ceres)

astronomy/ astronomy-photo/ comets/ astronomy-photo-asteroids.html Other asteroid photos.

February 18, 2023 Astronomy: Project

• Since two years I have used a Linux based control system for my astro equipment. In the Windows world it's ASCOM drivers you use, in Linux it's INDI drivers. The INDI EQMOD driver control SkyWatcher's mounts. It's an old driver and I have to fix one or two problems with it. It's written in C++. It was 27 years ago I did something with C++, so it's a big step for me, but now I must solve it:

  astronomy/ projects/ project-indi-drivers/ 01-project-indi-drivers.html
  (INDI EQMOD driver)

Update:
Auto guiding test, RA drift
Added RA drift compensation
More updates about Custom Gear Ratio, page 3
Added info for Custom Gear Ratio, page 3

Other astronomy projects:

February 11, 2023 Astronomy: Project

• I have written about Raspberry and the INDI drivers a couple of years now. Different setups has been placed at different projects and it could be difficult to find them. Now I made a new page with an overview and links to them:

  astronomy/ projects/ project-kstars-raspberrypi4/ 12-project-kstars-raspberrypi4.html
  (Setup INDI drivers, devices)

Other astronomy projects:

February 9, 2023 Astronomy: Project

• When setting up a Raspberry as an astroserver the most difficult is to get the GPS dongle connect to the system. The GPS is important when not connected to internet to get correct location and time. I have done this setup many times now but still confusing. Now I have rewrite my guide how to do it. A lot of help from my friend and from the INDI forum:

  astronomy/ projects/ project-heq5/ 07-heq5.html
  (Setup GOSD in INDI)

Other astronomy projects:

February 7, 2023 Astronomy: Project

• The last days I have designed a battery bracket for my telescope. It's not waterproff so it shouldn't stand on the ground. This bracket is attached on one of the legs on the mount, a HEQ5:

  astronomy/ projects/ project-small-practical-knobs-brackets/ 06-project-small-practical-knobs-brackets.html
  (Battery bracket, practical small brackets)

Other astronomy projects:

6 Februari, 2023 Astronomi, Historier

• En kvällstur till Tyresta Naturreservat för att fota kometen ZTF

  astronomy/ astronomy-stories/ astrofriend-night-diaries/ astrofriend-night-diary-20230205-se.html
  (En kvällstur till Tyresta)

Andra astronomihistorier:

February 6, 2023 Astronomy: Project

• Now when I'm almost up and running my bigger mount, the EQ6 there is one modification I want to do. Earlier I replaced the latitude adjuster screw on my HEQ5 mount, it worked very well and now I do it on my EQ6 mount too:

  astronomy/ projects/ project-eq6-dismantling-rebuilding/ 21-eq6-dismantling-rebuilding.html
  (EQ6 latitude adjuster screw)

Other astronomy projects:

February 5, 2023 Astronomy, comets

A new comet is approaching us, the comet ZTF C/2022 E3. It will be as brightest in January in the Northern world. On the Christmas night I got my first clear sky and I could take photos of it from the balcony:

The comet ZTF C/2022 E3:

• astronomy/ astronomy-photo/comets/ ztf-c2022-e3/ ztf-c2022-e3.html
  (Comet ZTF C/2022 E3)

astronomy/ astronomy-photo/ comets/ astronomy-photo-comets.html Other comet photos.

February 3, 2023 Astronomy: Tutorial

I found a way to disable the auto focus function in my Canon ES 6D camera when still the lens is in autofocus:

• astronomy/ tutorials/ tutorial-canon-remote-control/ page01-tutorial-canon-remote-control.html
  (Canon remote control)

You find it on page 4.

Other astronomy tutorials:

January 29, 2023 Astronomy: Calculations

• Comet's speed differ from the sidereal rate. In most mounts a correction of the mounts speed can be input. Often these values are expressed in degrees/hour but need to be in arcsec/sec. I have done a calculator that do this conversion on my homepage:

  astronomy/ astronomy-calculations/ angle-conversions/ angle-conversions.html
  (Angle calculations)

Other astronomy calculations:

January 28, 2023 Astronomy: Project

• Sight, when doing polar align it will help if I can aim the telescope coarse at the polar star with some sight device. I designed one of the simplest and added it to the page with small practical devices:

  astronomy/ projects/ project-small-practical-knobs-brackets/ 05-project-small-practical-knobs-brackets.html
  (Sight, some practical small devices)

• Now down loadable as a STL file if you want to print one for your telescope:

  3d-printing/ sight/ 01-sight.html
  (Sight, some practical small devices)

Other astronomy projects:

January 24, 2023 Astronomy: Project

• Long time ago I started a Flat Field Calibrator project where I use a LED stripe and 3D-printed parts. Got a lot of problem with the 3D-printer and the project fell in sleep. Now I started it up again:

  astronomy/ projects/ project-flat-calibrator/ 01-project-flat-calibrator.html
  (DIY/3D Flat field calibrator)

Other astronomy projects:

January 16, 2023 Astronomy: Tutorial

One of my first tutorials I wrote was about how to do a relative guiding on comets. It guide on a star and the computer calculate the offset speed between the star and the comet and correct for that. I have looked through the text and updated links and added more photos. The software has developed a lot but still the principle is the same:

• astronomy/ tutorials/ tutorial-gimp-astrophotography/ 01-tutorial-gimp-astrophotography-introduction.html
  (Comet relative guiding)

Other astronomy tutorials:

12 januari, 2023

Mörka observationsplatser: Astronomi

Titta på dessa två videor tagna från England respektive Teneriffa.

• https://www.youtube.com/ watch?v=3mb8vBmCzvo
  (Is this the Most Powerful Little Telescope in the Universe? Astrobiscuit YouTube)

England har ungefär samma klimat som vi har i Sverige, känner ni igen er ?

• https://www.youtube.com/ watch?v= fdQgBnEWHdY
  (Observing and Imaging Milky Way from dark skies of Tenerife, Refreshing views YouTube)

6 timmars flygresa och man har det så här. De här farbröderna har verkligen förstått hur man kan njuta av sin favorithobby.

Andra observationsplatser i Stockholm:

January 10, 2023 Astronomy

The year that's gone by:

The year 2022 I achieved some important goals in my astronomy hobby:

• I got my camera sensor clean: Camera sensor cleaning
• I got my low weight equipment working, polar align in less than 20 minutes, auto focus: Transportable equipment
• I got my flat field calibrator working: Flat field calibrator
• I learned how to use Siril to pre process astro images: Siril
• I learned how to use Gimp to post process astro images: Gimp tutorial
• I interviewing people about the solar eclipse 1954: Solar eclipse 1954
• I took the first step to design a medium format off-axis adapter: Medium format off-axis adapter
• I almost finished my APO refractor focuser: APO refractor focuser DIY
• We visited more observatory sites:
  Stockholm Saltsjöbaden, Uppsala old observatory, Kvistaberg Observatory, Croatia observatories: Visit to observatories

A good year !

Other astronomy:

December 19, 2022 Astronomy, double star

From our balcony with a very narrow view there are not many objects to choose from. This night I took photos of Messier 40. An optical double star:

M40 an optical double star:

• astronomy/ astronomy-photo/ double-stars/ m40/ m40.html
  (M40 an optical double star)

Other double stars:

December 7, 2022 Astronomy, solar eclipse history

I have asked all my friends and relatives if someone have a memory from Sweden's last total solar eclipse 1954. I got an enormous response with lot of stories about this. I have collected them on a separate page and included some other information:

The Solar eclipse 1954 in Sweden:

• astronomy/ astronomy-articles/ solar-eclipse-1954/ solar-eclipse-1954.html
  (Solar eclipse 1954 in Sweden)

Other astronomy articles:

December 6, 2022 Astronomy: Events reports

• I have collected my Astronomy events reports at one page:

  astronomy/ astronomy-articles/ astronomy-events-reports.html
  (Astronomy Events reports)

Other astronomy events reports:

December 1, 2022 Cars, Chrysler Crossfire:

• I'm preparing to upgrade the rear chassi of my car. Most important is the rubber bushings that is too soft:

  vehicles/ my-cars/ chrysler-crossfire/ upgrading-rear-chassi/ 01-upgrading-rear-chassi.html
  (Upgrading the rear chassi)

Other DIY repair tips for Chrysler Crossfire (Mercedes):

November 24, 2022 Astronomy: Project

• I have the last twenty years thought about medium format cameras. Later years digital mirror less cameras are much cheaper and have CMOS sensors which make them better. Maybe I will stay with full frame, but now I try to design an off-axis adapter with two filter drawers, just to see if I can fit it in the limited space:

  astronomy/ projects/ project-medium-format-offaxis/ 01-project-medium-format-offaxis.html
  (Medium format off-axis adapter 3D CAD)

Other astronomy projects:

November 19, 2022 Astronomy, observatory sites

2021 we visited Kvistaberg's and Tamm's observatories and took outdoors photos. Now we got the opportunity to come inside and see the big Schmidt Cassegrain telescope, see page 1b:

 Kvistaberg's and Tamm's Observatories:

• astronomy/ observatory-sites/ tamms-observatory/ 01-tamms-observatory.html
  (Kvistaberg's observatory, Schmidt Cassegrain telescope, 2022)

Other observatory sites:

November 12, 2022 Astronomi, Historier

• SMHIs prognos lovar en klar natt i Stockholm. Jag ger mig ut till Björnöreservatet på Ingarö för att fota nebulosor.

  astronomy/ astronomy-stories/ lars-karlsson-night-balcony-work/ lars-karlsson-night-balcony-work-20221112-se.html
  (En natt på Björnöreservatet fotandes nebulosor)

Andra astronomihistorier:

November 7, 2022 Astronomy, observatory sites

The last observatory we visited in Croatia was the Rijeka Observatory. They find it very interesting and guided us around in the observatory:

Rijeka Observatory:

• astronomy/observatory-sites/ rijeka-observatory-croatia/ 01-rijeka-observatory-croatia.html
  (Rijeka Observatory, 2022)

Other observatory sites:

November 7, 2022 Astronomy, observatory sites

Earlier I visited the Uppsala old Observatory. I could only see them from outdoors. Now my friend Christoffer have sent me some photos of the interior with the old telescopes:

Uppsala old Observatory:

• astronomy/ observatory-sites/ uppsala-old-observatory/ 01-uppsala-old-observatory.html
  (Uppsala old Observatory)

Other observatory sites:

November 4, 2022 Travel Europe

• I visited Croatia in 2012 and like it a lot. Maybe a new visit to that country but at a different place ? Our early itinerary and the travel report:

  travel/ europe/ croatia-2022/ 00-croatia-northern-part.html
  (Two weeks and five coast towns at Northern Croatia, 2022)

Other travels in Europe:

October 18, 2022 Astronomy, observatory sites

On our latest travel in Europe in Croatia we got a lot of astronomy related things to see. First out, the street astronomer in Rovinj:

Street astronomer in Rovinj:

• astronomy/ observatory-sites/ rovinj-street-astronomer-croatia/ rovinj-street-astronomer-croatia.html
  (Street astronomer Josip in Rovinj, 2022)

Other observatory sites:

October 21, 2022 Astronomy, solar eclipse history

I found earlier a documentary film of the 1914 years solar eclipse. Now I have analyzed the film and done some comments and a simulation of it:

The Solar eclipse 1914:

• astronomy/ astronomy-articles/ solar-eclipse-1914/ solar-eclipse-1914.html
  (Solar eclipse 1914)

Other astronomy articles:

September 29, 2022 Astronomy, observatory sites

I found some very old drawings of the Stockholm's old Observatory which I have included in my and Nippe's article:

Stockholm old Observatory:

• astronomy/ observatory-sites/ stockholms-observatory/ stockholm-observatory.html
  (Stockholm's old Observatory)

Other observatory sites:

September 27, 2022 Astronomy, observatory sites

In September it was the Astronomy Day in Sweden. We visited the observatory at Saltsjöbaden which had Open House. Follow us on these two guided tours we joined:

Stockholm "New" Observatory:

• astronomy/ observatory-sites/ saltsjobaden-observatory/ 01-stockholms-observatory.html
  (Stockholm's "new" Observatory)

Other observatory sites:

September 11, 2022 HIFI

• At a car meeting I sat with my friends and got nostalgic. We talked about old HIFI and what we have had in earlier days. Here I have wrote it down:

  sound-image/ hifi-1970s-1980s/ 01-hifi.html
  (My HIFI in the 1970s to 1980s)

Other Sound and Image:

September 6, 2022 Travel Europe

• We started in July to draw plans for our summer trip. A round trip in Northern Europe by ferry, busses and trains. It went up to be a ferry and train trip in Northern Germany:

  travel/ europe/ germany-northern-part-2022/ 01-germany-northern-part.html
  (By train in Northern Germany, 2022)

All days of travel report finished.

Other travels in Europe:

28 augusti, 2022 Nöjen i Stockholm

Restauranger:

• Tidigare tipsade jag om takpubar och restauranger, mycket trevligt men inte billigt. Nu har jag kompletterat med en lista på restauranger där man kan äta god mat utan att det kostar väldigt mycket:

  pleasure/ restauranger/ restauranger.html
  (Listor över restauranger i Stockholm med god mat och överkomliga priser)

Andra nöjen: Nöjen i Stockholm

August 21, 2022 Boats / Monalisa

• Stefan has sent me even more photos of his renovation of his boat Ellinor, sister boat to my father's Monalisa:

  vehicles/ everts-cruiser-monalisa/ everts-cruiser-monalisa.html
  (Photos of the anchor)

Other ships and boats:

August 21, 2022 Travel Gotland in Sweden

• It's summer now and then we travel around in Sweden. This time we visit the beautiful island Gotland. I have been at that island three times before, but always exiting. My girlfriend has a special mission, she wants to find traces of her ancestors:

  travel/ sweden/ gotland-2022/ 01-gotland-2022.html
  (Visiting the island Gotland in Sweden, 2022)

  All days completed.

Other travels in Sweden:

29 juli, 2022 Historia, Stockholm

• I Stockholm finns många spännande platser att undersöka. Ett av dom är Västra Stambanans gamla dragning mellan Liljeholmen och Södra Station på Södermalm. Den sträckan lades ned år 1929 då tågtrafiken flyttade till nya Årstabron.

  history/ vastra-stambanan/ 01-vastra-stambanan-sv.html
  (Västra Stambanan, Stockholm)

Andra saker om Sveriges historia:

6 juli, 2022 Historia, Galgbackar

• Under ett par vandringar i Stockholms Stad med omgivningar har vi undersökt de platser där folk avrättats i gångna tider, Stockholms galgbackar.

  history/ galgbackar-stockholm/ 01-galgbackar-stockholm-sv.html
  (Avrättnings och galgbackar i Stockholm)

Andra saker om Sveriges historia:

June 3, 2022 Astronomy: Astronomy Project

• Today I try to do some radical about my friction coupled focuser. 3D-Printing Rack & Pinion gears (and later Push Pull screws):

  astronomy/ projects/ project-focus-friction/ project-focus-friction.html
  (Project: Focus friction coupler)

Other astronomy projects:

June 2, 2022 Travel Sweden

• Steam trains are always exiting, I have done two travels with a steam train from Stockholm City to Nynäshamn. Both of them at Christmas. One more visit to the train museum at Nynäshamn:

  travel/ sweden/ nynashamn-steamtrain-2005-2009/ 01-nynashamn-steam-train.html
  (From Stockholm City to Nynäshamn by Steam train, Sweden from 2005 to 2009)

Other travels in Sweden:

30 april, 2022 Nöjen i Stockholm

Takpubar och restauranger:

• Nu till årets sommar kan vi nästan koppla av från Covidbekymren. Vi vågar gå ut igen och träffa folk med viss försiktighet. Sommarens projekt blir att besöka några av Stockholms takpubar och restauranger. De har blivit väldigt populära på senare år. Här har jag listat de mer kända och gjort en karta så ni hittar dit:

  pleasure/ takpubar/ takpubar.html
  (Listor och kartor över takpubar och restauranger i Stockholm)

Andra nöjen: Nöjen i Stockholm

7 april, 2022 Resor till sjöss

Min fars äventyr som sjöman under åren 1937 till 1945:

• Vem har inte drömt om att göra en jorden runt resa någon gång i sitt liv. Min pappa Evert gjorde det redan innan han var 20 år fyllda. Han mönstrade på handelsfartyg och hamnade ända borta i Kina och andra länder i Asien. Det här skedde delvis under Andra Världskriget, det var många fartyg som gick under från minor och torpeder, även svenska fartyg. Tre av fartygen han var på förliste pga detta, dock något efter att han mönstrat av. Trevligt nog har jag en hel del bilder till pappas alla berättelser om de här 7 åren till sjöss. Denna spännande historia kan ni följa här:

  travel/ world/ evert-at-sea-1937-1945/ 01-evert-at-sea-start-sv.html
  (Min fars äventyr till havs åren 1937 - 1945)

Other history related:

28 mars, 2022

Mörka observationsplatser: Astronomi

• I södra Stockholm på ön Torö är man långt från stadens ljus. Här är några foton från en parkering i naturreservatet.

• Örudden på Torö:

  astronomy/ observationsplatser/ orudden/ observationsplats-orudden.html
  (Observationsplatser Örudden Torö, Stockholm)

Andra observationsplatser i Stockholm:

All other news: News.

October, 2022 Astronomy, Impact structures (meteorite craters)

In Mars 2022 I passed close to the lake Västra Styran. I know I have read about it somewhere that it's maybe an old meteorite crater:

• astronomy/ meteorite-craters/ impacts.html
  (Meteorite crater Västra Styran, 2022)

It's no 10 on the map.

other meteorite craters:

Mars 17, 2022 Astronomy: Project

• Recently I bought a HEQ5 mount. My idea is to use that mount when travel by my car. Much less weight compare to my EQ6 mount. When I'm using my 300 mm lens I don't need the stability of the EQ6, and the HEQ5 mount has about the same precision. Problems solve: the serial cable, the EQDIRECT has not the same connector and not so good power connector:

  astronomy/ projects/ project-heq5/ 01-heq5.html
  (Project: HEQ5)

Other astronomy projects:

Mars 13, 2022 Astronomy: Project

• My pier I built many years ago was designed to take the EQ6 mount. Now I adapt it to also handle the smaller HEQ5 mount:

  astronomy/ projects/ project-pier-mount/ project-pier-mount.html
  (Project: Adapt pier to HEQ5 mount)

Other astronomy projects:

January 29, 2022 Astronomy: Project

• My old project with a Raspberry Pi2+ as an astroserver never worked very well, the process power from the computer was to weak. Now I do a new project of it with the new power full Raspberry Pi4 with 4 GB RAM:

  astronomy/projects/project-kstars-raspberrypi4/ 01-project-kstars-raspberrypi4.html
  (Project: Raspberry Pi4 as an astroserver)

Other astronomy projects:

January 16, 2022 Astronomy, Seven stars in Big Dipper, part of constellation Great Bear

Tonight I have problem which object on the heaven I wanted to take photo of. Then I saw that I had the constellation Great Bear outside the window. Why not take photos of the seven stars that built the Big Dipper which is a part of the Great Bear ? Afterwards I can analyze the images and see what's more there, sounds a bit exiting to me:

• astronomy/ astronomy-photo/ double-stars/ big-dipper-stars/ big-dipper-stars.html
  (Seven stars in Big Dipper)

Other stars:

January 5, 2022 Astronomy tutorial: Ekos Sequencer

• Included in the KStars is the Ekos. Ekos control the devices in your astroequipment. Included in this is a sequencer, a tool where you can hold your evening objects and the sequencer pick them up one by one in the most useful order. This is something new to me and all these advanced function is operated by the tiny Raspberry processor:

  astronomy/ tutorials/ tutorial-ekos-sequencer/01-tutorial-ekos-sequencer
  (Ekos Sequencer)

Other astronomy tutorials:

January 11, 2022 Astronomy: Lens data base

• When using a lens' built in focus motor it could behave different when controlling focus by remote. I have here collected some information from APT forum to get a better overview of which lenses is to prefer to use for astrophoto in that sense:

  astronomy/ tutorials/ database-apt-focus-af-mf-lenses/ database-apt-focus-af-mf-lenses.html
  (Data base: lenses autofocus behavior when remote controlled)

Other astronomy tutorials:

November 14, 2021 Historia, Nya Slussen byggs upp

• Nu är det november år 2021. Vi har idag en fin klar himmel och solen tränger ned till oss. Vi utnyttjar dagen till att åka in till Slussen för att se hur bygget går, senaste bilderna längst ned på sidan.

  history/sverige-stockholm-slussen/ sverige-stockholm-slussen-start.html
  (Gamla slussen rivs och Nya Slussen byggs, Stockholm)

Andra saker om Sveriges historia:

September 1, 2021 Bilskrotar kartor:

• För dig med gammal klassisk bil, när reservdelarna inte finns att köpa nya längre så blir man hänvisad till bilskrotarna. Jag har kompletterat mina tidigare listor med kartor för att lättare finna dom:

  vehicles/ bilskrotar/ bilskrotar-sverige.html
  (Bilskrotar Sverige)

Övrigt skrotbilar:

August 15, 2021 Travel Sweden

• During Corona times there hasn't been very much traveling, but now in August we took a cruise along the Swedish coast. From Stockholm to Höga Kusten:

  travel/ sweden/ ms-symphony-stockholm-harnosand-hogakusten-2021/01-ms-symphony-stockholm-harnosand-hogakusten-2021.html
  (Höga Kusten [High Coast], Sweden 2021)

Other travels in Sweden:

April 15, 2021 Astronomy: Project

• My friend Lars B do most of his projects from the very basic, cast worm gears, 3D-print details etc:

  astronomy/ projects/ project-do-it-from-basic-by-larsb/ 01-do-it-from-basic-by-larsb.html
  (Project: Lars B's projects)

Other astronomy projects:

Mars 23, 2021 Astronomy

prof Gösta Gahm

I, prof Gösta and Peter at the Sweden Solar system presentation, Gunilla is the photographer.

Something very sad has happen, in January 2021 I got the information that Gösta had passed away. We had known each other for more than 25 years, both I and Gunilla had him as a teacher in more than one courses we took in astronomy from 1995 to 2002 and we kept the contact since then. This meeting with the Jupiter model was the last time we saw him and at Christmas I got a greeting from him, since then nothing. Goodbye Gösta, we hope you have a great time up among the stars !

Gösta has one asteroid named after him: 10997 Gahm.

Lars and Gunilla

• astronomy/ astronomy-articles/ sweden-solar-system-jupiter-2019/ sweden-solar-system-jupiter.html
  (Sweden Solar system, Jupiter)
• https://en.wikipedia.org/ wiki/ Gösta_Gahm
  (Gösta Gahm, Wikipedia)

Other astronomy events reports:

29 januari, 2021 Resor till sjöss

Nyheter om det år 1940 förlista fartyget S/S Sylvia:

• En släkting till en av de omkomna har hittat till min sida om fartyget S/S Sylvia och har en del att berätta:

  vehicles/ ship-sylvia-1940/ 01-sylvia-sv.html
  (Fartyget S/S blir torpederat år 1940)

Other history related:

January 9, 2021 3D CAD

• In this project I make drawings for GT2 pulleys that I will use in my lens focuser:

  3d-printing/ camera-lens-focus-gears/ 01-camera-lens-focus-gears.html
  (Making drawings for GT2 pulleys to lens focuser)

Other 3D Printer and CAD projects:

15 november, 2020

Befästningslinjen Södra fronten: Svensk historia

• Under Coronatider gäller det att hitta spännande saker att besöka på en dagsturs avstånd. Det här är ett försvarsverk du finner söder om Stockholm.

  history/ befastningslinjen-sodra-fronten/ befastningslinjen-sodra-fronten.html
  (Befästningslinjen Södra Fronten, Sveriges historia)

Annan historia relaterad till Sverige:

August 17, 2020 Astronomy, meteor showers

In August we have the Perseid meteor shower, I did it a bit different this time. I used a GoPro camera:

• astronomy/astronomy-photo/ meteor-shower/ perseids/ perseids-2020/ perseids-2020.html
  (Perseid meteor shower, 2020)

Update:
Even more objects

Other meteor showers:

29 juli, 2020

Modellbåten Flamingo från Wentzel: Hobby

• När jag var omkring 9 år köpte min pappa mig min första modellbåt i trä. Den har nu efter 25 år på irrfärder hamnat hemma hos mig igen:

  vehicles/ models/ 02-wentzels-flamingo.html
  (Modellbåten Flamingo från Wentzel, hobby)

Andra båtar i full skala:

June 12, 2020 Cars

• I got a tips from a friend of a new place where they have car meetings, The Nut House.

  vehicles/ the-nut-house-2020/ the-nut-house-2020.html
  (The Nut House, car meeting in Sweden)

Other car meetings:

April 30, 2020 Home Theatre

• It's dark and winter now. I can't use my summer car and most days are cloudy so can't do my astronomy hobby either. What to do ? Restart my old hobby Home Theatre, of course !

  sound-image/ home-theatre-resurrection/ home-theatre-resurrection.html
  (Home Theatre resurrection, 2019)

Other Sound and Image:

December 12, 2019 Astronomy, calculation

• Try my calculator based on Frank Drake's Equation:

  How many intelligent civilizations are out there in Milky Way ?

  astronomy/ astronomy-calculations/ drakes-equation/ drakes-equation.html
  (Frank Drake's Equation calculator)

Other astronomy calculations:

November 8, 2019 Astronomy / seminar

• Seminars "The ALMA Fornax Cluster Survey" by Nikki Zabel.

  How does the galaxy cluster environment affect molecular gas and star formation? 2019
  (Institution of Astronomy, Stockholm's University)

Other speech, seminar and articles:

July 3, 2019 Travel, walks with old and new photos

• One old idea I have is to take old photos and then take new ones from the same place and compare. I have started with the island Riddarholmen in Stockholm. The old photography is from the 19th century. Much more complicated then I first thought, it will take long time, here is the beginning of the work:

  travel/ sweden/ old-and-new-photographs/ introduction-old-and-new-photographs.html
  (Old and new photography from Stockholm)

Other things about Swedish history:

May 19, 2019 Sound / Image

• Biograf (Cinema) Sländan Museum:

  sound-image/ cinema-slandan-museum/ cinema-slandan-museum.html
  (Biograf Sländan Museum)
• We had a visit to a camera flee market today, we was a bit early and found this when we waiting, a cinema machine museum.

Other things about sound and cinema:

27 januari, 2019

Nya kartor över fornlämningar: Fornhistoria

• Kartor för fornfynd, det är för dig som gillar att vara ute i naturen och leta efter vår spännande historia.

• Här finner du de nya kartorna:

  history/ sverige-fornlamningar-kartor/ fornlamningar-kartor-sv.html
  (Fornlämningskartor, Sverige)

Other history related in Sweden:

All other news: News.

New links:

Here I have collected new links that I found interesting.

Technology, Astronomy, Cars, Travels etc.

The New Link page have been moved to here: New Links.

Astronomy interesting reading: NEW March 2023 !

• links/ links-astronomy-filter.html (Filter reviews)
• links/ links-astronomy-focuser.html (Focusers)

Astronomy interesting reading: NEW February 2023 !

• links/ links-astronomy-directdrivemount.html (Mounts DIY, Harmonic drive, reviews)
• links/ links-astronomy-camerareview.html (Camera Reviews)

Astronomy interesting reading: NEW January 2023 !

• links/ links-astronomy-astrotourism.html (Astro tourism)
• links/ links-astronomy-telescope-review.html (Telescope reviews)
• links/ links-astronomy-imageprocessing.html (Image processing)

Overview of the links:

• Links

Must do stuff:

Technology, Astronomy, Cars, Travels etc.

(look carefully that it has not been canceled or has a changed date)

March 18, 2023 Astronomy

Comet C/2023 A3 C/2023 A3 Tsuchinshan-ATLAS, something to look for, October, 2024.

Maybe a really bright naked eye comet:

• http://www.aerith.net/ comet/ catalog/ 2023A3/ 2023A3.html
  (C/2023 A3 Tsuchinshab-ATLAS, Seiichi Yoshida)
• https://skyandtelescope.org/ astronomy-news/ observing-news/ anticipating-comet-tsuchinshan-atlas-c-2023-a3/
  (C/2023 A3 Tsuchinshan-ATLAS, Sky and Telescope)

January 3, 2023 Astronomy

Comet C/2022 A2 PanSTARRS, something to look for, Jan to March, 2023.

But it's weak, best to photograph it:

• http://www.aerith.net/ comet/ catalog/ 2022A2/ 2022A2.html
  (C/2022 A2 PanSTARRS, Seiichi Yoshida)

November, 2022 Astronomy

Comet C/2022 E3 ZTF:

• Bright comet to view 2022/23, C/2022 E3 ZTF, in January to February it can reach magnitude 4:

  http://www.aerith.net/ comet/ catalog/ 2022E3/ 2022E3.html
  (Comets to view 2022, Sky and Telescope)

March, 2022 Astronomy

Comets to view 2022:

• https://skyandtelescope.org/ astronomy-news/ comets-to-view-in-2022/
  (Comets to view 2022, Sky and Telescope)
• https://astrobackyard.com/ 8-deep-sky-targets-galaxy-season/
  (8 Deep-Sky Targets for Galaxy Season, AstroBackyard)

Föredrag: (Stockholm, Sverige)

This is only for you who live in Stockholm, Sweden or want to travel and make a visit here.

De flesta av de här föredragen hålls i Stockholm. Vanligtvis är de på svenska men ibland på engelska. Läs noga på deras hemsida så att det inte blivit inställt eller flyttat.

Området är naturvetenskap.

2022 Visning / Föredrag

• Visningar av Alba Nova teleskopet:

  http://www.astro.su.se/ om-oss/ evenemang/ teleskopvisningar
  (Alba Nova teleskopet, Stockholms universitet)

Advertisement / Annons: