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December 2, 2024

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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.

Welcome to my home !

Astrofriend's homepage

Since 2002


Highlights!

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

Contents:


News:

Here I have collected news I found interesting.

Technology, Astronomy, Cars, Travels etc.


November 28, 2024 Astronomy: Tutorial

Update:
Added deconvolution, page 8

Other astronomy tutorials:

Tutorial: Siril for pre processing astrophotography

November 28, 2024 Astronomy: Tutorials

Other astronomy tutorials:

Equipment for auroras

November 24, 2024 Astronomy: Project

Other astronomy projects:

Bracket frame for camera's USB connector

16:e november, 2024 Sweden Astronomi, Historier

Andra astronomihistorier:

Tyrestareservatet i månsken, november 2024

November 16, 2024 Astronomy: Project

Other astronomy projects:

EQ6 mount and OnStep driver

November 13, 2024 Astronomy: Tutorials

Other astronomy tutorials:

Equipment for auroras

12:e november, 2024 Sweden Historia, Älvsjö

Andra reportage om gamla Älvsjö:

Långbrodalsvägen i Älvsjö, 2024

7:e november, 2024 Sweden Astronomi, Historier

  • Med min astrokamrat Rolf åkte vi ut till Tyresta för att fotografera stjärnhimlen. Vi var lite tveksamma att åka iväg då vädret var lite osäkert. Men väntar vi några dagar så börjar Månen bli störande, efter lite funderande gav vi begav oss iväg. Extra spännande för mig är att testa utrustningen igen efter några justeringar:

    astronomy/ astronomy-stories/ astrofriend-night-diaries/ astrofriend-night-diary-20241107-se.html
    (Tyrestareservatet och nebulosor, november 2024)

Andra astronomihistorier:

Tyrestareservatet och nebulosor, november 2024

6:e november, 2024 Sweden Historia, Götgatan

  • Tidigare gjorde jag ett bildspel med gamla fotografier från Hornsgatan. Nu har jag börjat göra motsvarande för Götgatan här i Stockholm. Det här blir inte en film utan en hemsida med fotografier på. Jag lägger till länkar med information för er som vill fördjupa sig i historien:

    history/ stockholm-gotgatan/ 01-gotgatan.html
    (Götgatan i nya och gamla bilder)

    Andra platser med historia:

    history/ historia Sverige.html
    (Historia Sverige)

Uppdateringar:
De äldre fotografierna är inlagda, kompletteras nu med nytagna fotografier.

Götgatan i gamla och nya fotografier,i Stockholm, 2024

November 6, 2024 Astronomy: Project

Other astronomy projects:

EQ6 mount and OnStep driver

October 30, 2024 Astronomy: Project

  • To skip the hand controller for the SkyWatcher mount and direct connect to a computer is practical, but you need a special cable. Here is some information how to do that, even ideas about wireless control:

    astronomy/ projects/ project-eqdirect-cable/ 01-eqdirect-cable.html
    (EQDirect cables and wireless for SkyWatcher EQ6 and HEQ5 mounts)

Other astronomy projects:

EQDirect cables and wireless for SkyWatcher EQ6 and HEQ5 mounts

October 27, 2024 Astronomy: Project

Other astronomy projects:

KStars and GPS

October 27, 2024 Astronomy: Project

  • I recently bought a Nikon D800 and an advanced Pentax FA 300 mm ED f/4 lens. My idea is to modify this camera for H-Alpha and replace my Canon 6D. Above that I need to build adapters, enclosures, voltage converters, guide camera, focus mechanism and drivers etc. You can follow the progress here:

    astronomy/ projects/ project-nikon-d800/ 01-nikon-d800.html
    (Project: Nikon D800 / Pentax 645 FA 300mm ED)

Other astronomy projects:

Projects: Nikon D800

October 17, 2024 Astronomy: Project

Other astronomy projects:

KStars, Linux comands and udev solver

October 13, 2024 Astronomy: Project

Other astronomy projects:

Projects: Astroserver Raspberry Pi5

5:e oktober, 2024 Sweden Historia, Vasastan

Vasastan vid Vasaparken i Stockholm, 2024

30:e augusti, 2024 Sweden Historia, Nya Slussen byggs upp

Senaste Slussen promenad längst ned på sidan.

Andra saker om Sveriges historia:

Karl Johan Slussen i Stockholm

29:e augusti, 2024 Sweden Historia, Älvsjö

Gamla torpet Ormkärr i Älvsjö

25:e augusti, 2024 Sweden Astronomi, Historier

  • Nu har vi kommit mot slutet av augusti, då kan man säga att astronomisäsongen startar i Sverige. Normalt brukar jag börja med Perseiderna i mitten av augusti men i år blev jag lurad på det av massiva moln. Ikväll lovas det dock klart väder. Försökte locka med några kamrater ut på Björnö natirreservat, men det är söndag och många ska till arbetet i morgon. Ändrade mina planer och kör från balkongen ikväll istället. Här får ni följa förberedelserna där:

    astronomy/ astronomy-stories/ astrofriend-night-diaries/ astrofriend-night-diary-20240825-se.html
    (Säsongstart augusti 2024)

Andra astronomihistorier:

Säsongstart, augusti 2024

August 24, 2024 Astronomy: 3D-printing Project

  • I have sometimes used my polar finder scope when aiming for the polar star. To make it easier I use a right angle prism. To fit that right angle prism to the polar telescope I 3D-printed an adapter I found on www, it worked but a bit wobbly, it could be better. Now I have designed my own adapter which is more stable:

    3d-printing/ 90degree-polarfinder-adapter/ 03-90degree-polarfinder-adapter.html
    (Project: 3D-printed right angle adapter EQ6/HEQ5 mount)

Update:
Now it can be downloaded as a STL file.

Other 3D-printing projects:

3D-printed right angle adapter

August 18, 2024 Car meetings

Other car meetings in Sweden:

Lake Mälaren aroundg, 2024

18:e augusti, 2024 Sweden Historia, Göta Landsväg i Stockholm

  • Göta Landsväg, landsvägen till och från Stockholm har en tusenårig historia på vissa platser. Här är början på den, från Skanstull till Södertälje:

    history/ stockholm-gota-landsvag/ 01-skanstull-en.html
    (Göta Landsväg i Stockholm)

    Uppdateringar med fotografier på sträckan Årsta till Liseberg, sidorna 3 till 6.

Andra saker om Sveriges historia:

Göta Landsväg, Stockholm

July 19, 2024 Travel Europe

Other travels in Europe:

Brussels in Belgium, 2011

July 4, 2024 Car meetings

Other car meetings in Sweden:

Trosa car meeting, 2024

22:a juni, 2024 Sweden Historia, Skålgropstenar i Stockholm

Andra saker om Sveriges historia:

Skålgropsten vid Lerkrogen i Älvsjö, 2023

16:e juni, 2024 Sweden Historia, nattvandring i Älvsjö

Andra saker om Älvsjös historia:

Älvsjö nattvandring 2015

9:e juni, 2024 Sweden Historia, Fornborgar

Andra saker om Sveriges historia:

Kagghamra Fornborgar i Södra Stockholm, 2024

May 21, 2024 Cars, Chrysler Crossfire:

Other vehicles:

Chrysler Crossfire: Melted H7 socket

May 17, 2024 Astronomy: Lens data base

Other astronomy tutorials:

Data base: Lenses with focus motor that works for astrophotolens

6:e maj, 2024 Sweden Bildspel

Andra bildspel:

Hornsgatan i Stockholm i äldre tider, 1880-1944

May 5, 2024 Cars, Chevrolet Corvette C3:

Other vehicles:

Chevrolet Corvette C3: Rear axle

May 3, 2024 Photography: Macro

Other Photography:

Macro photography, slider setup v2, 2024

March 29, 2024 Astronomy: Astrophotos

Other astronomy photos:

Hale Bopp, La Palma 1997

Other Photography:

A closer look in the graden, Sweden 2012

20:e mars, 2024 Sweden 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:

My father's adventures at sea, 1937 - 1945

February 11, 2024 Technique: Raspberry NAS

  • Our NAS server aging. It has to be replaced by something new. I have read a lot of positive comments about setup a Raspberry as a NAS. It has low power consumption which is good with the increased energy prices we have today:

    technique/ raspberry-nas/ 01-raspberry-nas.html
    (Raspberry NAS)

Other about Techniques:

Raspberry NAS, OpenmediaVault

January 31, 2024 Astronomy: Astronomy Project

Update:
Pin layout, page 6
Motor current, page11

Other astronomy projects:

Stepper motor driver

January 25, 2024 Astronomy: Astrophoto

  • It feels like that it's clouds on the sky every night. Is it really that bad ? I collected every astrophoto I had taken from 2013 until today and sorted they on months. From this I get a clear view which months is best. Note a long clear night I could had taken more than one object. Normal exposure length is 60 minutes per object:

    astronomy/ astronomy-photo/ database/ astronomy-photo-database-statististica.html
    (Astrophoto database statistics)

Note:
I live in a very light polluted area, Bortle Class 9. But anyway it's exciting to take astrophotos.

Other astrophotos:

Accumulated astrophotos over the years per month

January 15, 2024 Astronomy: Astronomy Project

Other astronomy tutorials:

Drift align and auto guide calibration

January 15, 2024 Astronomy: Astronomy Project

Other astronomy projects:

EQ6 Dismantling and rebuilding for belt drive

11 januari, 2024 Sweden Nöjen i Stockholm

Restauranger:

  • Här finns listat några restauranger som vi brukar besöka. God mat och hyfsade priser. Nytt är också en lista på restauranger som har pensionärs rabatter. Har inte hunnit besöka dessa själv än:

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

Andra nöjen: Nöjen i Stockholm

Blå Porten, restaurang i Stockholm

11 januari, 2024 Sweden Nöjen i Stockholm

Takpubar:

  • Kompletterad med några takpubar till. Sommarens projekt blir att besöka några av Stockholms takpubar. 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

TAK, takpub i Stockholm

January 5, 2024 Home Theatre

Other Sound and Image:

Home Theatre resurrection, 2019

December 25, 2023 Astronomy: Astronomy Project

Update:
Off-axis guide, page 8
Chassi, page 2, 3, 4
Wheel 3D-printed, page 1, 3, 4, 5

Other astronomy projects:

3D-printed filter wheel

December 13, 2023 Astronomy: Project

Update:
New adapter, for APO 130 mm refractor, page 4

Other astronomy projects:

Projects: DIY/3D Flat calibrator

December 6, 2023 Travel Europe

Other travels in Europe:

Alicante, Spain, 2010

September 26, 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)

Other astronomy projects:

Projects: INDI drivers

September 17, 2023 Astronomy, observatory sites

Other observatory sites:

Michael's Torö observatory, Sweden 2023

August 18 20, 2023 Travel Europe

  • Late in the summer I got a cruise as a birthday gift, it take us to Finland and the city Turku or Åbo as we say in Sweden. I haven't been there since the 1970s so it will be exiting. Finland belonged to Sweden during 700 years, we lost it 1809 in a war:

    travel/ europe/ finland-turku-2023/ finland-turku.html
    (Turku in Finland, 2023)

Other travels in Europe:

Turku (Åbo) in Finland, 2023

March 9, 2023 Astronomy: Project

Other astronomy projects:

Pentax 645 300 mm f/4 ED lens

January 29, 2023 Astronomy: Calculations

Other astronomy calculations:

Calculator: Angle conversion

January 16, 2023 Astronomy: Tutorial

Other astronomy tutorials:

Tutorial: Comet relative guiding

December 7, 2022 Astronomy, solar eclipse history

  • The Solar eclipse 1954 in Sweden:

    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:

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

Other astronomy articles:

Solar eclipse 1954 in Sweden

December 6, 2022 Astronomy: Events reports

Other astronomy events reports:

MAK, Mariestad Star Party, 2018

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:

Sonab 2212

August 21, 2022 Boats / Monalisa

Other ships and boats:

Evert's mahogany cruiser Monalisa

6 juli, 2022 Sweden Historia, Galgbackar

Andra saker om Sveriges historia:

Avrättning och galgplatser i Stockholm

June 2, 2022 Travel Sweden

Other travels in Sweden:

From Stockholm City to Nynäshamn by steam train, from 2005 to 2009den 2021

28 mars, 2022 Sweden

Mörka observationsplatser: Astronomi

Andra observationsplatser i Stockholm:

All other news: News.

Observationsplats Örudden på Torö

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 number 10 on the map.

other meteorite craters:

Meteorite craters, Västra Styran Sweden, 2022

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:

Ekos sequencer

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:

Bilskrotar

April 15, 2021 Astronomy: Project

Other astronomy projects:

Lars B's projects

Mars 23, 2021 Astronomy

prof Gösta Gahm

Gösta Gahm, 1942 - 2020 professor emeritus of astronomy

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 of the 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

Other astronomy events reports:

29 januari, 2021 Sweden Resor till sjöss

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

Other history related:

Fartyget S/S Sylvia

January 9, 2021 3D CAD

Other 3D Printer and CAD projects:

3D CAD: making drawings for GT2 pulleyes to lens focuserder

29 juli, 2020 Sweden

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:

Modellbåten Flamingo från Wentzels

November 8, 2019 Astronomy / seminar

Other speech, seminar and articles:

Seminar: How does the galaxy cluster environment affect molecular gas and starformation ? by Nikki Zabel

May 19, 2019 Sound / Image

Other things about sound and cinema:

Biograf (Cinema) Sländan Museum, 2019

27 januari, 2019 Sweden

Nya kartor över fornlämningar: Fornhistoria

Other history related in Sweden:

All other news: News.

Gånggrift Hallarör i Västergötland
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