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April 3, 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.

April 3, 2020 Astronomy: Comet

Here are two maps with the comets position from April 1, 2020, the time is 10 pm, earlier it isn't very dark. You can print them to bring with you. The location is Sweden.

Comet C/2019 Y4 Atlas, credit CdC, Skychart
(Click on the image and get a full resolution in a new window, credits: CdC, Sky Charts)

Or the Black & White version which is better in the dark if you print it out.

Comet C/2019 Y4 Atlas, credit CdC, Skychart
(Click on the image and get a full resolution in a new window, credits: CdC, Sky Charts)

Maybe middle of April will be best, but people are already taken photos if it now. Later the comet will be very low to the horizon and it's not dark enough. You should have a clear view to the Northern direction (in Sweden). Bring warm clothes with you !

More links with information about comet C/2019 Y4 Atlas:

http://www.aerith.net/ comet/ catalog/ 2019Y4/ 2019Y4.html (Seiichi Yoshida's homepage)

https://skyandtelescope.org/ astronomy-news/ comet-atlas-will-it-become-a-naked-eye-object/ (Sky and Telescope)

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

April 3, 2020 Astronomy: Tutorial

Update:
Subtraction of background.
Added align R, G, B layer.

Other astronomy tutorials:

Tutorial: Gimp for astrophotography

Mars 22, 2020 Astronomy, photography

Last time I found there are a lot of galaxies in Southern direction. Tonight I once again aim the telescope in that direction:

Other galaxies:

NGC 4435, M84, M86, M87 galaxies, 2020

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 19, 2020 Astronomy, photography

The open cluster Trumpler 37:

Other Globular clusters:

Open cluster Trumpler 37, 2016

Mars 18, 2020 Astronomy, photography

The galaxy UGC 10822 is very weak, but big as the Moon, once again I try to get a glimpse of it:

Other galaxies:

UGC10822 galaxy, 2020

Mars 16, 2020 Svenska Astronomi, min nattbok

  • Tredje natten på kor tid med en klar himmel. Säsongen går ju mot sitt slut så det är verkligen uppmuntrande. Några bilder och funderingar över astronomi projekten och dess framtid:

    .. lars-karlsson-night-balcony-work-20200316-se.html
    (Min nattbok om mina vedermödor ute i kylan)

Andra astronomi historier:

M97 Ugglenebulosan

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

Mars 8, 2020 Astronomy: Tutorial

  • Excel sheet how to find parameters to a synthetic flat image. This is the preparation for a new function in AstroImageJ. I have some old photos left from earlier owned cameras and telescopes. The flat frame images to these were not perfect and I can't take any new. There are other advantages of making synthetic flat also and some disadvantages:

    astronomy/ tutorials/ tutorial-flat-synthetic/ 01-tutorial-flat-syntethic.html
    (Calculating the parameters for a synthetic flat image)

Update of Excel sheet and the new plugin Flatfield for AstroImageJ.

Other astronomy tutorials:

Tutorial: Synthetic flat image

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 20, 2020 Astronomy, photography

One of few chances to get a photo of the Orion Nebula from our balcony, it's normally hidden behind the houses:

Other nebulas:

Orion Nebula, M42, 2020

January 13, 2020 Astronomy, calculation

Other astronomy calculations:

Minimize vignetting calculator

January 11, 2020 Astronomy, photography

When looking through my old data I found this unprocessed photo, a comet. Very weak and hard to see:

Other comets:

Comet Atlas C/2017 M4, 2018

January 10, 2020 Astronomy, photography

In Southern direction at night from where I live there is an Open Star Cluster, M44:

Other open star clusters:

M44 Open Star Cluster, 2020

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

30 december, 2019 Sweden Resor till sjöss

Min fars äventyr som sjöman under åren 1937 till 1945:

Uppdateringar om fartygen som Skepparen tjänstgjorde på, se sid 18.

  • 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
    (My father's adventures at sea, 1937 - 1945)

Other history related:

My father's adventures at sea, 1937 - 1945

December 19, 2019 Sound & Image

Other Sound & Image:

My favorite songs and music

December 12, 2019 Astronomy, calculation

Other astronomy calculations:

Frank Drake's Equation calculator

December 11, 2019 Travel

Other travels in Europe:

Krakow, 2010

December 6, 2019 Home Theatre

Other Sound and Image:

Home Theatre resurrection, 2019

November 28, 2019 Astronomy

Other observatory sites:

Stockholm's Observatory, 2009

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

October 6, 2019 Astronomy: Tutorial

Other astronomy tutorials:

Tutorial: Setup off-axis adapter

October 15, 2019 Astronomy, 3D printer

Update:
Printer calibration
Update 3D printer software

Other astronomy projects:

3D printer, assembling and setup

September 30, 2019 Astronomy

  • My EQ6 mount is good but there are some weak point in the construction. One of them is the Altitude polar align adjustment. When living at 60 degree latitude as I do it doesn't work very well. Here I starting a study of what others have done and what equipment there are to buy to solve this problem:

    astronomy/ projects/ project-eq6-wedge-rebuilding/ 01-eq6-wedge-rebuilding.html
    (EQ6 wedge rebuilding)

Other astronomy projects:

EQ6 wedge rebuilding

July 27, 2019 Cars

Other ships, cars and aircrafts:

A visit to the junkyard in Osby, 2019

July 14, 2019 Travels / Sweden

  • One place I always have found beautiful in books is Norrköping and its river Motala Ström. We have travel by car through Norrköping many times but never stopped at the old town center. This day my girlfriend had to visit the archive of Norrköping in her research and I follow to walk in the old city of Norrköping and take some photos:

    travel/ sweden/ motala-strom-norrkoping-2019/ motala-strom-norrkoping-2019.html
    (Walking along Motala Ström in old town of Norrköping, 2019)

Other travels in Sweden:

Walk in old town of Norrköping, 2019

July 9, 2019 Ships

Other ships, cars and aircrafts:

Icebreaker Atle in Frihamnen, 2019

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

April 14, 2019 Astronomy

Other observatory sites:

Astronomy Cafe, 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)

April - May, 2020 Astronomy

It could be as bright as magnitude -1.

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.

9 december 2019 till 5 januari 2020 Utställning (OBS ! Flyttad till Lidingö stadshus !)

Se även min berättlase om min fars Pettersson kryssare Monalisa.

2020 Visning / Föredrag

Albanova
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