Unknown (to me) object in M44 - Forums

Topic starter

9 hours ago

Hello there!

since I have quite a few reflections in my mono imaging train, I have optimised everything over the past few weeks, i.e. dissassembling the optical train, painting internal shiny stuff black, increasing the dithering amount, repositioning the OAG prism, and optimizing flats. Yesterday I tested my setup on M44 and took 60×60s L and 20×60s RGB images. After having finished post processing and checked if any reflections were still visible, I found this weird colored streak in my image. After blinking through the raw data I saw a small object which looked like a faint star and which moved from right to left in the image. The weird coloring makes sense now since I shot in the order of LRGB with my filter, therefore the streak starts out in grey from the right and then goes through RGB in the same order to the left. The length of the colors of the streak also corresponds to the imaging time with each filter.

📷 M44_uo.pngOut of curiosity I would like to see if I can identify this object, but as I have never done something like this I don’t know on which website/database to look. I’d assume it’s not a satellite, but what could it be? I’ve only checked Stellarium so far and during the imaging time I did not see any object passing through this region. Could anyone be so kind as to point me in a direction or tell me what this object could be?

Thanks and clear skies!

Alex

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Quinn Groessl

IOTD Staff

9 hours ago

It’s some sort of artifact. Usually it repeats as it does in your image. In the extreme bottom left it’s a bit less prominent, but it’s there as well. I don’t know what causes it, but I see it in images occasionally.

Alex Penzias

Topic starter

8 hours ago

Hi Quinn,

thanks for your reply! Is it really an artifact? When I blink through the raw data, I see a small round object moving from right to left. Since it is a small dot moving from right to left this would also explain it looking like a streak in the stacked image above.

I did not notice a similar streak on the lower left at the edge of the image as well. Just checked it in Blink and this, too, is a very faint dot that moves from right to left.

Clear skies,

Alex

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Tony Gondola

Frequent contributor

Exemplary contributor

8 hours ago

It’s probably an asteroid. If you get a copy of SAS pro (it’s free) you can use the “supernova and asteroid hunter” script along with your data to find out which one it is:

https://www.youtube.com/watch?v=cgq8J6wsEOs&t=1s

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Alex Penzias

Topic starter

8 hours ago

Thank you @Tony Gondola for the help. I shall try and use the script from Setiastro.

Clear Skies,

Alex

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Brian Puhl

IOTD Staff

6 hours ago

100% an asteroid, this is what they look like with mono imaging.

You can plate solve with asteroids in your image in pixinsight, or plug in your date/time/location into stellarium after downloading asteroids via plug in.

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