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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.

Twitter:

• Astrofriend now on Twitter as @AstrofriendLars :

  @AstrofriendLars at Twitter

Totally new for me, maybe I will just use Twitter to advertise news on Astrofriend's website. Lets see how it develops. Old man learning new things.

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Highlights!

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

Contents:

• NewsMostly highlights on Astrofriend's homepage, see also left column Latest News
• New linksInteresting information
• Must do stuffWhat makes your life valuable
• Speech nature science, Föredrag naturvetenskap(most speeches in Swedish, Stockholm Sweden)

News:

Here I have collected news I found interesting.

Technology, Astronomy, Cars, Travels etc.

February 17, 2019

• Going for Madeira.

• Read about Madeira at Wikipedia:

  https://en.wikipedia.org/ wiki/ Madeira
  (Maderia, Wikipedia)

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February 17, 2019

• Mount Gearbox Ratio calculator. Are you building your own mount to the telescope? Here is a calculator that you maybe can have use of.

• Mount Gearbox Ratio calculator:

  astronomy/ astronomy-calculations/ mount-gearbox-ratio/ mount-gearbox-ratio.html
  (Web calculator)

February 16, 2019

• One more clear sky. This time I decided to do something new, taking photos of two double stars.

• Double Star STT 307 and HU 662:

  astronomy/ astronomy-photo/ astronomy-photo-double-stars.html
  (Double Stars)

8 februari, 2019

Min fars äventyr som sjöman under åren 1937 till 1945:

• Har lagt till fartygen S/S Torsa, S/S Hermod och S/S Rota. Nu finns också länkar till rederierna inlagda.

• Har lagt till fartygen M/S Baltia och S/S Bele samt flera kompletteringar på de tidigare fartygen efter tips från andra sjöfarare.

• Ångisbrytaren Göta Lejon tillagd med bilder från systerfartyget Sankt Erik.

• Militära grundutbildningen på börjad samt kompletteringar på diverse tidigare sidor.

• Många uppdateringar, de första 8 händelserna finns med.

• 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. Jag har nu mer än hälften klart till denna spännande historia som ni kan följa här:

  travel/world/evert-at-sea-1937-1945/ 01-evert-at-sea-start-sv.html
  (My father's adventures at sea, 1937 - 1945)

  Idag är det skrivet på svenska, men planen är om tiden räcker till att även ha den översatt till engelska.

February 5, 2019

• Astronomy, have you ever thought about if you have the correct debayer pattern for your color camera? I thought maybe I have missed something when I created the macro where I retrieve the color information from a debayered color image. I have created a simple test pattern and did some test.

• Tutorial: From raw to demosaic to rggb to combine rgb:

  astronomy/ tutorials/ tutorial-raw-demosaic-combine/ tutorial-raw-demosaic-combine.html
  (Bayer pattern test)

February 5, 2019

• Three years ago I took a photo of the globular cluster M92. Now I tried once again and too see how my new setup of the equipment perform.

• Globular cluster M92:

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

February 4, 2019

• One more night with no clouds. I setup my telescope for photographing the galaxy Messier 63. You really need a dark sky for this which I don't have. But interesting to do a test to see what I get.

• Sunflower Galaxy M63:

  astronomy/ astronomy-photo/ galaxies/ m63/ m63-galaxy.html
  (Sunflower Galaxy M63)

February 4, 2019

• Do you find impact craters from meteorites interesting? I have updated my page with a better map of Swedish impacts to make it easier for you to find them.

• Impact craters:

  astronomy/ meteorite-craters/ impacts.html
  (Astronomy, Impact craters)

February 1, 2019

• Have you ever thought about how many bits you needs in your astro image files and calculations?

• Here is my new Bit Resolution Calculator:

  astronomy/ astronomy-calculations/ bit-resolution/ bit-resolution.html
  (Astronomy: Bit resolution calculator)

27 januari, 2019

Nya kartor över fornlämningar:

• Nu har jag lärt mig att göra mycket bättre kartor, 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)

  De här nya kartorna ersätter de tidigare som man var tvungen att ladda ned som kml filer.

January 22, 2019

• Comet 123P/West-Hartley from Hagsätra in Stockholm.

• This comet wasn't easy to catch, weak, strong light pollution and low to the horizon:

  astronomy/ my-astronomy-photo/ comets/123p-west-hartley.html
  (Comet: 123P/West-Hartley, January 18, 2019)

January 21, 2019

• Blood Moon over Hagsätra.

• Early in the morning of January 21st we once again had a Blood Moon, did you see it?

  astronomy/ my-astronomy-photo/ moon/blood-moon-2019.html
  (Blood Moon 2019)

11 januari, 2019

• Har ni följt mina promenader med fotodokumentation av Karl Johanslussen och dess rivning? Idag var det för omväxlingens skull vackert väder, jag tog en utflykt till Slussen för att se hur arbetet fortskrider:

  history/ sverige stockholm slussen/ sverige stockholm slussen 20190111.html
  (Rivning av Slussen i Stockholm, 2019)

January 8, 2019

• When I have done investigating about my father's boat Monalisa I have come in contact with Helmut. He has bought a C. G. Pettersson boat with the name Sindbad in Sweden and then take it down to his home country Switzerland. He has done a fantastic restoration and rebuilt of the boat, here I help him to make a page with information about his fantastic project:

  vehicles/helmuts-sindbad/01-helmuts-sindbad.html
  (Helmut's C. G. Pettersson cruiser Sindbad, built 1914)

  Today I came in contact with Willy and Rasmus, two of the earlier owners and they could give us more information.

Helmut is eager to know everything about the history of this boat, if you know anything, let us know!

January 6, 2019

• I have found new information in my investigations about my father's Petterssonboat. Maybe it's not a C. G. Pettersson design but a Victor Israelsson:

  Evert's Mahogany cruiser Monalisa, part I, Sweden
  (My father's Pettersson cruiser Monalisa, owned 1964 to 1973)

December 18, 2018

• Travel: Many years ago I and Rosie did this exiting travel to the very Northern Sweden and Lappland:

  travel/sweden/lappland-2002/01-introduction-to-lappland-1963.html
  (Sweden's Lappland, 2002)

November 20, 2018

• Chrysler Crossfire, Replacing the heater blower:

  vehicles/ my-cars/ chrysler-crossfire/ heater-blower-fan-replacement/ 01-heater-blower-fan-replacement.html
  (Replacing the heater blower)

November 17, 2018

• If you living north or south you have problem to look into the polar scope. I have built an adapter to have an angled viewfinder on the polar scope:

  astronomy/ projects/ project-star-adventurer-angled-viewfinder/ project-star-adventurer-angled-viewfinder.html
  (Star Adventurer and angled viewfinder)

19 oktober, 2018

• Bor du i södra Stockholm och har svårt att hitta mörka platser att fotografera stjärnhimlen ifrån? Här är några förslag från mig och mina vänner:

  astronomy/ observationsplatser/ observationsplatser.html
  (Observationsplatser södra Stockholm)

October 8, 2018

• Tutorial: Remote control of Canon camera from a smart phone.

How many times have you tried to see the camera display when the camera pointing upwards to the stars? In my attempts to make my transportable astronomy equipment more user friendly I'm doing this. Make my Canon camera remote controlled from a smart phone:

It's not difficult to use this remote function and you can use this to much more than just astrophotography.

New links:

Here I have collected new links that I found interesting.

Technology, Astronomy, Cars, Travels etc.

28 October, 2018

Many years ago I read about CMOS sensors that in future could have non destructable read out. With that technique you can read out one pixel many times and with reduced readout noise. Alternative read out one low gain and one high gain and then combine these two readouts as a high dynamic data read out.

• FLI has an astronomy CMOS camera that can do that:

  https://www.flicamera.com/ kepler/ kepler.html
  (FLI Kepler KL4040, FLI)

One problem, expensive! I hope that normally DSLR cameras use this technique in future.

You find above links later on the link page:

• Links

Must do stuff:

Technology, Astronomy, Cars, Travels etc.

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

February, 2019

• Comet C/2018 Y1 (Iwamoto) visit us:

  http://www.aerith.net/ comet/ catalog/ 2018Y1/ 2018Y1.html
  (46P/Wirtanen, Seiichi Yoshida)

• Look at your local star map where it is and its orbit, you can use CdC or Skychart:

  CdC or Skychart (Free to download)

It could be as bright as magnitude +7, you need at least a binocular to see it.

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.

7 februari, 2019

• Hade Einstein fel? Edvard Mörtsell:

  https://www.fysik.su.se/ om-oss/ evenemang/ hade-einstein-fel-1.410298
  (Alba Nova, Stockholms universitet, Fysikum)

2019

• Visningar av Alba Nova teleskopet:

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

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