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Old 02-06-2021, 01:30 PM
N1 (Mirko)
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Eclipse Star Field

Last week's total lunar eclipse but with focus on the background stars to reveal the Moon's motion through space. We counted 63 occultations (disappearing or reappearing stars, or both) during the 31 minutes of the sequence:

https://drive.google.com/file/d/19qb...ew?usp=sharing
it's a 10Mb GIF, best to download before viewing, worth it I think.

C6@f/2, ASI174MM, 1.7s subs, 0.5fps

And, a composite of disk & background to resemble scope view. No HDR, this looks more realistic to me.

RC6, ASI294
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Old 02-06-2021, 01:53 PM
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multiweb (Marc)
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That's really cool.
As an exercise I blinked the stars I've got from Sydney assuming the shot was at totality to compare with yours from south NZ. There is quite an offset.
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Old 02-06-2021, 02:11 PM
N1 (Mirko)
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Hi Marc, thanks for your comment, and that's a nice shot as well. Yes we were talking about that yesterday, in the other thread. And your blink comparison is great. If you look at the gif animation in the link I gave though, you can see that the Moon is moving fast, and in the direction our two images appear offset. What that means is that the timing of each shot is absolutely critical. If you can provide the exact hh:mm:ss time of your shot, I'll do some digging for the appropriate raw frame. We've grabbed the whole thing so it will be in there. That'll eliminate any timing error, and we're left with pure parallax between our respective sites. That'll be cool to see. Let us know...from memory, mine above was from 11:19:19 UT but I'd have to confirm that later on
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Old 02-06-2021, 02:28 PM
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Quote:
Originally Posted by N1 View Post
Hi Marc, thanks for your comment, and that's a nice shot as well. Yes we were talking about that yesterday, in the other thread. And your blink comparison is great. If you look at the gif animation in the link I gave though, you can see that the Moon is moving fast, and in the direction our two images appear offset. What that means is that the timing of each shot is absolutely critical. If you can provide the exact hh:mm:ss time of your shot, I'll do some digging for the appropriate raw frame. We've grabbed the whole thing so it will be in there. That'll eliminate any timing error, and we're left with pure parallax between our respective sites. That'll be cool to see. Let us know...from memory, mine above was from 11:19:19 UT but I'd have to confirm that later on
Here you go: UTC 10:28:02
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Old 02-06-2021, 02:37 PM
N1 (Mirko)
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Here you go: UTC 10:28:02
Thanks. 10 or 11? Our sequence didn't start til 11:03 and went for half an hour.
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Old 02-06-2021, 02:49 PM
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Thanks. 10 or 11? Our sequence didn't start til 11:03 and went for half an hour.
That shot is from 21:28 local time here. We're GMT+10. Totality lasted only ~20 min. I'll double check what I have and the time on the camera too.
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Old 02-06-2021, 02:57 PM
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Thanks. 10 or 11? Our sequence didn't start til 11:03 and went for half an hour.
You're right. Just checked my camera time and it is offset by 1h. So it is 11:28:02 UTC. So that's on the tail end. I can get a sub closer in the middle if it's easier for you. Let me know.
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Old 07-06-2021, 05:39 PM
N1 (Mirko)
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Hi Marc, here's the frame I found for that time. It's sometime after 3rd contact so the part outside the umbra has been obliterated by the returning light, but you can still see what's happening. The fact that the offset is in the same general direction of the Moon's path across the field during the eclipse suggests that we were along a similar ground track that it had relative to a given star. If you do have another frame closer to mid eclipse that would be quite interesting to do the same exercise again.


Also, here's a better link to the full animation:
https://vimeo.com/559593634
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Old 07-06-2021, 05:57 PM
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Here you go: UTC 11:20:42 That should be the totality.
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