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ColibriKBO / ColibriObservatory

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Elongated stars on Green #9

Closed RomanAkhmetshyn closed 2 years ago

RomanAkhmetshyn commented 2 years ago

While doing a sensitivity check I noticed that the median combined image (9 images of 0.025sec exposure I believe) uploaded to astrometry.net had pretty long stars. If it's something to do with the pointing model, I could try to fix it myself when there will be no observations planned on Green. Could you please confirm this? @mjmazur image

RomanAkhmetshyn commented 2 years ago

I just compared the first and last image of the stacked median. It appears that the stars don't move but are elongated in single images. image

mjmazur commented 2 years ago

Ok. So, we need to focus the next clear night. We don't have an autofocus routine, but we should be able to put something together with a bit of code. I'll think about whether we can hack ACP into doing it or whether we need to write a small python script that does it.

Mike

From: RomanAkhmetshyn @.> Sent: July 21, 2022 10:40 AM To: ColibriKBO/ColibriObservatory @.> Cc: Michael Mazur @.>; Mention @.> Subject: Re: [ColibriKBO/ColibriObservatory] New pointing model for Green (Issue #9)

I just compared the first and last image of the stacked median. It appears that the stars don't move but are elongated in single images. [image]https://user-images.githubusercontent.com/108425347/180241678-e3cfaa74-a89f-42a6-90c6-a9df04f03a3c.png

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mjmazur commented 2 years ago

Is it 9 consecutive images? If so, check later in the night. It wouldn't trail that much in a quarter of a second unless the tracking is off. What do the individual images look like? Are they trailed? If so, it's likely the focus that needs to be adjusted.

Mike

From: RomanAkhmetshyn @.> Sent: July 20, 2022 3:11 PM To: ColibriKBO/ColibriObservatory @.> Cc: Michael Mazur @.>; Mention @.> Subject: [ColibriKBO/ColibriObservatory] New pointing model for Green (Issue #9)

While doing a sensitivity check I noticed that the median combined image (9 images of 0.025sec exposure I believe) uploaded to astrometry.net had pretty long stars. If it's something to do with the pointing model, I could try to fix it myself when there will be no observations planned on Green. Could you please confirm this? @mjmazurhttps://github.com/mjmazur [image]https://user-images.githubusercontent.com/108425347/180062990-74215b66-569c-4662-abbe-9b2cf0d89991.png

— Reply to this email directly, view it on GitHubhttps://github.com/ColibriKBO/ColibriObservatory/issues/9, or unsubscribehttps://github.com/notifications/unsubscribe-auth/ABPGQYN43VVRVXMOQCJFA3LVVBFOBANCNFSM54E2CIMQ. You are receiving this because you were mentioned.Message ID: @.***>