Missing Stars

[neilparker62]

Expected Behaviour

Stellarium shows all stars I can see.

Actual Behaviour

Stellarium seems to be missing some stars I see in my DSLR photo.

Steps to reproduce

Take a pic of an area of the night sky (I chose the tail of Scorpius) and make sure the stars in it match up with what Stellarium shows.

System

• Stellarium web
• Operating system: Windows 10
• Graphics Card: Radeon
• Screen type (if applicable): Resolution, HighDPI, scaling

Logfile

If possible, attach the logfile log.txt from your user data directory. Look into the Guide for its location.

[github-actions]

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[alex-w]

@neilparker62 did you install all star catalogs?

[neilparker62]

No - am using Stellarium web so I assumed the cloud version would generate its star maps from a cloud database.

[gzotti]

Still probably no catalog is complete to show "all" stars from your photos. You should be able to identify many stars. In the desktop application you can use the photographic DSS layer.

[neilparker62]

Are you saying the DSS layer is not available on Stellarium web - only on the Desktop version ? "All stars" are of course countless but my photo is just from a 50mm zoom lens (not even telephoto) on a Canon EOS D600 so the pics should not show much more than what is visible by eye. And I had thought that at least should match up with the Stellarium view - star for star.

[neilparker62]

I found another high resolution picture of Scorpio's tail and it also did not have those stars. So now I'm wondering was it perhaps the Starlink satellite "fleet" which happened to be passing through Scorpio's tail that morning. If I want to show the relevant pictures, how can I do that here ?

[gzotti]

I can read at the bottom of this box: "Attach files by dragging & dropping, selecting or pasting them."

[neilparker62]

Thanks - that was a bit blind of me. Was looking intently at the top menu items.

Tail of Scorpius: 13th June

Tail of Scorpius 11th June. Stars not present in previous image are ringed in yellow. "Stars" that appear to have moved relative to others are marked in orange.

[gzotti]

Is the top-left circled object on the same pixel coordinate? Did you make a series to detect and exclude hot pixels? Else, could be anything from satellites to minor planets. Always make a series of pictures to see changes.

[neilparker62]

As far as I can make out , the top 2 circles (orange) show "stars" which are present in both pics but have moved relative to the other stars. So they are either planets or satellites. The other two circled "stars" are only visible in the second picture so I need to check for planets or satellites against Scorpius on 11th June. I will also take pictures over the next few days to see if they re-appear or not.

[neilparker62]

No discrepancies with Stellarium view show up on my photo of the same region of sky - taken early this morning.

[neilparker62]

There's one satellite showing up crossing Scorpius on 11th June. But not quite where my camera recorded. No planet anywhere near although I'm not quite certain what you mean by "minor planets" ?

[gzotti]

consider using your favourite search engine on "minor planet". Or our User Guide. Or some other astronomy introductory book.

[neilparker62]

Ok thanks - not a minor planet since I doubt any of those - not even Pluto - could be seen from a camera equipped with nothing more than a 50mm zoom lens. I guess that leaves us with satellites or perhaps camera 'artefacts' due to high ISO setting.