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November 22, 2020

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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


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 22, 2020 Cars, Chrysler Crossfire Wheels:

My old wheels have a lot of scratches and the wheels at rear look at bit small. I did some calculation to find which size of wheels and tires that fit in the back.

Other DIY repair tips for Chrysler Crossfire (Mercedes):

Chrysler Crossfire: Wheels and tires

November 19, 2020 Astronomy

Updates:
Added more links with information.

Other observatory sites:

Stockholm's Observatory, 2020

15 november, 2020 Sweden

Befästningslinjen Södra fronten: Svensk historia

Uppdatering:
Sjötorpsfortet tillagt.
Sundbyfortet tillagt.
Måndalsfortet tillagt, det sista fortet på denna försvarslinje.

Annan historia relaterad till Sverige:

Befästningslinjen Södra Fronten

24 oktober, 2020 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)

Uppdatering:
Interiörbilder från Engelsbergsarkivet av fartyget M/S Axel Johnson III
Sjömansrulla för fartyget S/S Torsa
Sjömansrulla för fartyget S/S Maria Gorthon

Other history related:

My father's adventures at sea, 1937 - 1945

21 Oktober, 2020 Sweden Astronomy, meteorit krater

Jag har här skrivit om ett par gamla artikelar och gjort de online på hemsidan. Det är meteoritnedslagen vid Dellensjöarna och Funäsdalen:

Andra meteoritkratrar:

Meteorite craters, Dellensjöarna Sweden, 2006

October 17, 2020 Cars, Chrysler Crossfire repair:

Vibrations from the wheels at higher speed could be caused from improper hub center rings. I checked these rings on my car today.

Other DIY repair tips for Chrysler Crossfire (Mercedes):

Chrysler Crossfire: Replacing the crankshaft sensor

October 13, 2020 Cars, Chrysler Crossfire repair:

It was long time since I had to do any repair on my car. Now when winter is coming and it start to be cold. What happen then ? The engine doesn't start !

Update:
Now the sensor is replaced and the engine starts, still to test during longer period.

Other DIY repair tips for Chrysler Crossfire (Mercedes):

Chrysler Crossfire: Replacing the crankshaft sensor

September 2, 2020 Travel

  • These are some old photos I took long time ago. We was on the road with a new car and stopped at the hotel Gyllene Uttern. The following morning we found the nearby village Röttle. One of the most beautiful places I have visited:

    travel/ sweden/ rottle-brahehus-2007/ 01-gyllene-uttern.html
    (Röttle, Sweden 2007)

    There are also some photos from the castle Brahehus.

Other travels in Sweden:

The village Röttle, Sweden 2007

2 september, 2020 Sweden

Vaxholms Yttre Befästningslinje: Svensk historia

Uppdatering:
Kompletterande text.

Annan historia relaterad till Sverige:

Siaröfortet

2 september, 2020 Sweden

Myttingelinjen Värmdö: Svensk historia

Uppdatering:
Kompletterande text.

Annan historia relaterad till Sverige:

Myttingelinjen

18 augusti, 2020 Sweden

Modellbåten Commodore från Graupner: Hobby

  • Ett par år senare efter bygget av den stora balsabåten Flamingo var det dags för nästa. Den läckra båten Commodore från Graupner:

    vehicles/ models/ 03-graupner-commodore.html
    (Modellbåten Commodore från Graupner, hobby)

Andra båtar i full skala:

Modellbåten Commodore från Graupner

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:

Update:
Even more objects

Other meteor showers:

Perseids meteor shower, 2020

August 13, 2020 Astronomy: Project

Other astronomy projects:

GoPro camera as a timelapse camera for meteor showers

August 10, 2020 Astronomy: Project

Other astronomy projects:

Lars B's metal cast project

August 6, 2020 Cars, Chrysler Crossfire repair:

Other DIY repair tips for Chrysler Crossfire (Mercedes):

Chrysler Crossfire: Replacing the engine air filters

Augusti 3, 2020 Sweden Historia, Slussen rivs

  • Ni har säkert inte kunnat undvika att läsa om hus gamla slussen rivs i Stockholm för att ge plats åt Nya Slussen. Nu i dagarna (år 2020) kan man läsa i tidningarna hur de funnit rester av den näst äldsta slussen, Christopher Polhems sluss. Jag har under den slussen lagt in en länk som visar bilder på vad de funnit.

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

Tragiskt att läsa att de beslutat riva de gamla viktiga historiska resterna av Polhems sluss, en kulturskatt som går förlorad för alltid.

Andra saker om Sveriges historia:

Karl Johan Slussen i Stockholm

July 31, 2020 Travel

Other travels in Europe:

 

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)

Update:
Har lagt till en lista på de modeller jag byggde, båtar, bil, flygplan.

Andra båtar i full skala:

Modellbåten Flamingo från Wentzels

July 19, 2019 Astronomy

  • From my friend Nippe I have got an article about Stockholm's old Observatory. I got permission to use it on my homepage and I have translated it to English and implemented it with my photographs from earlier:

    Sorry if the translation is not perfect, but I hope you will understand.
    Read more:

    astronomy/ observatory-sites/ stockholms-observatory/ stockholm-observatory.html
    (Stockholm's old Observatory, 2009)

Other observatory sites:

Stockholm's old Observatory, 2009

July 12, 2020 Astronomy, comet

Suddenly we got a bright comet, the C/2020 F3 Neowise:

Update:
One more photo.

Other comets:

Comet C/2020 F3 Neowise, 2020

June 29, 2019 Astronomy, 3D printer

Update:
Printer calibration
Update 3D printer software
Mechanical calibration

Other astronomy projects:

3D printer, assembling and setup

June 14, 2020 Photography

Other photography:

Photowalk in Hagsätra, 2020

June 12, 2020 Cars

Other car meetings:

Car meeting, The Nut House, 2020

May 30, 2020 Cars, Chrysler Crossfire repair:

Update:
Complement with more photos of the front suspension.

Other DIY repair tips for Crossfire (Mercedes):

Chrysler Crossfire: Checking front and rear suspension

May 29, 2020 Cars, Chrysler Crossfire video:

  • On the road with my Chrysler Crossfire:

Other of my videos

May 20, 2020 Cars

Other ships, cars and aircrafts:

Forest Truck, 2013

May 10, 2020 Astronomy: Project

Update:
Adding a GPS receiver.
First Light.

Other astronomy projects:

Raspberry Pi4 as an astroserver

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)

    Update:
    More details about HTPC setup and MPC.
    Test with a Raspberry Pi4 as a HTPC.

Other Sound and Image:

Home Theatre resurrection, 2019

April 25, 2020 Astronomy: Tutorial

Update:
Subtraction of background.
Added align R, G, B layer.
Separating stars and DSO.
Separating stars and DSO, alternative.
Correct image for Vignetting.

Other astronomy tutorials:

Tutorial: Gimp for astrophotography

April 3, 2020 Astronomy: Tutorial

Update:
Fits file support.

Other astronomy tutorials:

Tutorial: AstroImageJ, marcro update with Fits support

April 3, 2020 Astronomy, project

Other astronomy projects:

M13, 3x Drizzle

Mars 20, 2020 Astronomy, photography

The Globular Cluster M53:

Other Globular clusters:

See also galaxy clusters Leo Triplet, Leo I group and the galaxy M87:

Galaxies:
Globular Clusert M53, 2020

Mars 20, 2020 Svenska Astronomi, min nattbok

  • Fantastiska tider, det är en klar natt igen. Ut med telekopet på balkongen, trimmar in justering och fokus. Denna natt tar jag bilder i riktningen söderut. Passar också på att berätta lite om ett av de nya projektet som går framåt och nu är i det stadiet jag kan testköra:

    .. lars-karlsson-night-balcony-work-20200320-se.html
    (Min nattbok om mina vedermödor ute i kylan)

Andra astronomi historier:

Projekt: Find flat cal points

Mars 14, 2020 Astronomy, photography

One of the most beautiful objects on the sky is the planetary nebula M57, here is my photo of it:

Other Planetary nebulas:

Planetary nebula M57, 2020

11 mars, 2019 Sweden Historia, Slussen

Other history related:

Nya Slussen Stockholm 2020 Golden Bridge

February 23, 2020 Astronomy: Tutorial

I have added a function to stack aligned images.

Other astronomy tutorials:

Tutorial: AstroImageJ, update with menus

February 210, 2020 Travel

Other travels in Europe:

Lanzarote, Spain, 2020

February 13, 2020 Astronomy, photography

First time I use my 5 Inch APO refractor to take a photo of the Moon:

Other Solar system objects (very uggly):

Moon 2020, taken with a 5 Inch APO refractor

January 13, 2020 Astronomy, calculation

Other astronomy calculations:

Minimize vignetting calculator

January 10, 2020 Astronomy: Tutorial

Have you ever got the experience that your raw astrophotos are in portrait orientation and your software needs them to be in landscape orientation ? This tutorial is about a fix to that problem.

Other astronomy tutorials:

Tutorial: How to rotate raw-files

January 2, 2020 Astronomy

Other astronomy projects:

Summer project, dismantling the EQ6 mount and rebuilding

January 1, 2020 Astronomy

  • What is it with our weather ? Clouds and rain every night. The motivation for all amateur astronomers go deep in the ground.

    The last days I have spent on the Gaia space satellite. It's a astrometry observatory with extremely high precision. Could it be used to do something interesting ? I have collected some information here and a simple test by me to start with:

    astronomy/ science-data/ science-data-gaia.html
    (Gaia data archive)

    You can use it as a tutorial how to use the Gaia data.

    Update:
    New calculations of histogram over the positions of nearby stars.

Other astronomy science data archives:

Gaia data archive

December 12, 2019 Astronomy, calculation

Other astronomy calculations:

Frank Drake's Equation calculator

November 23, 2019 Travel

Other travels in Sweden:

Steam train from Stockholm to Katrineholm, 2005

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

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:

Old and new photography from Stockholm

June 7, 2019 Boats / Monalisa

Other ships and boats:

Evert's mahogany cruiser Monalisa

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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New links:

Here I have collected new links that I found interesting.

Technology, Astronomy, Cars, Travels etc.

September 29, 2019 Astronomy

 

August 20, 2019 Physics

 

August 20, 2019 Physics

 

April 18, 2019 Travel and Astronomy

Astro-tourism, a growing tourist travel area.

  • Astro Tourism:

    links/ links-astronomy-astrotourism.html
    (Astro Tourism, link collection)
  • I have primarily chosen places that I can reach from Sweden within 6 hours by air. Most of them are in Spain.

Andromeda M31 POSS-I

You find above links later on the link page:

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Must do stuff:

Technology, Astronomy, Cars, Travels etc.

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

May, 2020 Astronomy

Seiichi Yoshida's home page

May, 2020 Astronomy

Seiichi Yoshida's home page
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Föredrag: (Stockholm, Sverige) Sweden

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.

2020 Visning / Föredrag

9 december 2019 till 5 januari 2020 Utställning (Stängd nu)

Se även min berättlase om min fars Pettersson kryssare Monalisa.

2020 Visning / Föredrag

Albanova
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