I think I caught the ISS (or a flea on my objective)

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Starry Jack
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I think I caught the ISS (or a flea on my objective)

Post by Starry Jack » Fri Sep 04, 2020 4:34 pm

Anybody willing to confirm that this flea speck is the ISS? It does match the time and transit path. LOL
It's a 14MB video.

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Thanks,
Jack
TikTok 46 ISS.mp4
(14.59 MiB) Downloaded 45 times


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Re: I think I caught the ISS (or a flea on my objective)

Post by DeepSolar64 » Fri Sep 04, 2020 5:00 pm

I think you got it! Slowing the image down it can be seen a bit easier. It's obviously something small moving fast in front of the sun.


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Re: I think I caught the ISS (or a flea on my objective)

Post by Starry Jack » Fri Sep 04, 2020 6:47 pm

Hooray!!!!


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Re: I think I caught the ISS (or a flea on my objective)

Post by DeepSolar64 » Fri Sep 04, 2020 8:08 pm

Starry Jack wrote:
Fri Sep 04, 2020 6:47 pm
Hooray!!!!
👍🏻👍🏻👍🏻


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Re: I think I caught the ISS (or a flea on my objective)

Post by Starry Jack » Fri Sep 04, 2020 11:39 pm

I'm having doubts...I look at Alexandra's amazing captures (stolen here without permission) and I look at mine...maybe the FOV is different, but heck...mine is too fast for a bird but too small for ISS it seems to me? But the time and the transit path match...I'm just not sure:

Alexandra's:
Alexandra ISS Transit 50248805477_aca5245575_o.jpg
Alexandra ISS Transit 50248805477_aca5245575_o.jpg (522.73 KiB) Viewed 335 times
Alexandra ISS 50248605606_b37a168126_o.jpg
Alexandra ISS 50248605606_b37a168126_o.jpg (1.98 MiB) Viewed 335 times
Jack's:
Jack ISS Transit-09-04_16-34-51.jpg
Jack ISS Transit-09-04_16-34-51.jpg (68.42 KiB) Viewed 335 times


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Re: I think I caught the ISS (or a flea on my objective)

Post by rsfoto » Sat Sep 05, 2020 12:25 am

Hi Jack,

Could be and I guess now you know why it is important to know how the Sun depicts in your images and so the next time you can orient your FOV in such a way that you know where it is going to pass.

One thing you should not do is to try to chase it. Important is also to have a high frame rate.

Unfortunately these days there have not been much info on the Sun itself to get the correct orientation.

Perhaps next time. So far I have had only one succesfull ISS pass.

Just do not despair ;) ;) ;) ;)

This is a good page for predictions https://transit-finder.com/


regards Rainer

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Re: I think I caught the ISS (or a flea on my objective)

Post by Carbon60 » Sat Sep 05, 2020 6:47 am

Very debatable, Jack. On balance I would say not. I think it would have been larger and more defined had it been the ISS.

Stu.


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Re: I think I caught the ISS (or a flea on my objective)

Post by PDB » Sat Sep 05, 2020 7:32 am

According to the info from Calsky in your previous post, the ISS is 30" in diameter. (size can vary a lot, but 30" is not that small)

Did the calculation right for an ASI174 but my figures seemed to large ....

Anyway 30" is in between the size of Mars and Jupiter, so should be clearly visible.

Paul


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Re: I think I caught the ISS (or a flea on my objective)

Post by DeepSolar64 » Sat Sep 05, 2020 6:46 pm

If not the ISS then what would that object be that Jack caught quickly crossing the Sun? An insect? A bird?


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Re: I think I caught the ISS (or a flea on my objective)

Post by Carbon60 » Sun Sep 06, 2020 5:41 am

Hi James,

It's quite common to see 'stuff' transiting across the field of view, usually birds from around the garden or other local areas. Sometimes balloons are seen transiting more slowly and with a well defined shadow. I suspect Jack's transit was a bird.

Stu.


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Re: I think I caught the ISS (or a flea on my objective)

Post by Montana » Sun Sep 06, 2020 11:33 am

That is a hard one Jack. It is a great pity that just before the transit you seem to have zoomed in? What you need to do is be as far out as you can and leave the camera still. Let the ISS track across. If you have a fast frame rate then you should have at least a few frames in focus as long as the Sun was in focus.

Out of interest, Calsky will give you a good indication of size. The size of the ISS will depend on how far away it is from you. For my transit the distance was 557km away and 0.7 sec transit. I then got another alert at the end of August and this time the transit was nearly 3 seconds long but it was more than 2000 km away. It wasn't worth it, it would be minuscule.

What was your distance?

Alexandra



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Re: I think I caught the ISS (or a flea on my objective)

Post by Starry Jack » Sun Sep 06, 2020 2:05 pm

Thanks all. I artificially zoomed in using a post processing solution to get detail. My object was about a minute after published transit time so I went looking for it incase I was simply wrong in all my calcs.

I've seen many birds and this did not feel like a bird so then I wondered if this was a satellite of another kind.

Sadly, none of my other satellite tracking programs showed a satellite transiting.

I agree it is not the ISS.

ONWARD to the next transit.

Calsky does not show history, does it? I don't see a way to look at past events and check my calcs.

Cheers,
Jack


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Re: I think I caught the ISS (or a flea on my objective)

Post by Montana » Mon Sep 07, 2020 7:31 am

Jack, yes it does. I presume you are on your personal calendar. Make sure your location is accurate in your settings.

Go to Calendar
Set the date, time and duration. Set the day and maybe pick 9am, then a duration of 12 hours. Go to your ISS transit and in the description it shows the distance.

Alexandra
PS Calsky is accurate to the second so a minute over will be long gone. Make sure you have your location accurate and your time zone accurate in your settings. I would probably think you missed it due to not imaging in the correct part of the Sun. If you have a next time, try and get the camera so you can image the full disc, then you can get your orientations correct. In the library we have some helpful guides to getting orientation correct and try and match it with Tilting Sun and GONG to get a good feel for where you are.

viewtopic.php?f=7&t=28249



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