Starship Asterisk*

by **Nitpicker** » Sat Apr 13, 2019 11:08 pm

There was another pass on the 28th, 90 minutes earlier. It was 7 minutes from horizon to shadow.

by **RickyM** » Sat Apr 13, 2019 10:55 pm

Nitpicker wrote: ↑Fri Apr 12, 2019 11:27 pm That's the day before. I checked the 28th.

Sorry, put the wrong link up. This is the correct one, 3 minutes 38 seconds according to
https://www.heavens-above.com/passdetai ... 761&type=V

by **Nitpicker** » Fri Apr 12, 2019 11:27 pm

That's the day before. I checked the 28th.

by **RickyM** » Fri Apr 12, 2019 10:53 pm

https://www.heavens-above.com/passdetai ... 086&type=V

by **Nitpicker** » Thu Apr 11, 2019 11:56 pm

RickyM wrote: ↑Thu Apr 11, 2019 6:59 pm The passage of the ISS at that date, time and location wasn't 7 minutes long

My checks indicate it was visible for about 7 minutes. On what do you base your assertion? For how long do you think it was visible?

by **RickyM** » Thu Apr 11, 2019 6:59 pm

The passage of the ISS at that date, time and location wasn't 7 minutes long

by **Nitpicker** » Wed Apr 10, 2019 11:39 pm

Chris Peterson wrote: ↑Wed Apr 10, 2019 11:18 pm
Nitpicker wrote: ↑Wed Apr 10, 2019 10:22 pm
RickyM wrote: ↑Wed Apr 10, 2019 7:24 pm high frame rate digital camera. A total of 2500 frames were recorded during the 7 minute long visible ISS passage

5.95 fps is not a high frame rate.
The recording probably didn't cover the full 7 minutes. I would be surprised to learn these individual images were made with exposure times longer than 1/30 seconds.

Edit: I think the APOD author has said these images were exposed for 0.55 milliseconds each.
That all sounds reasonable. A sustained frame rate of 6 frames per second with individual exposure times of 1/2000 second or faster. Pretty typical for satellite imaging through a telescope.

The camera used, is advertised as being capable of up to 60 fps when recording the full sensor through a USB3 port. The frame rate was more likely higher than 6 fps and the video shorter than 7 minutes.

by **Chris Peterson** » Wed Apr 10, 2019 11:18 pm

Nitpicker wrote: ↑Wed Apr 10, 2019 10:22 pm
RickyM wrote: ↑Wed Apr 10, 2019 7:24 pm high frame rate digital camera. A total of 2500 frames were recorded during the 7 minute long visible ISS passage

5.95 fps is not a high frame rate.
The recording probably didn't cover the full 7 minutes. I would be surprised to learn these individual images were made with exposure times longer than 1/30 seconds.

Edit: I think the APOD author has said these images were exposed for 0.55 milliseconds each.

That all sounds reasonable. A sustained frame rate of 6 frames per second with individual exposure times of 1/2000 second or faster. Pretty typical for satellite imaging through a telescope.

by **Nitpicker** » Wed Apr 10, 2019 10:22 pm

RickyM wrote: ↑Wed Apr 10, 2019 7:24 pm high frame rate digital camera. A total of 2500 frames were recorded during the 7 minute long visible ISS passage

5.95 fps is not a high frame rate.

The recording probably didn't cover the full 7 minutes. I would be surprised to learn these individual images were made with exposure times longer than 1/30 seconds.

Edit: I think the APOD author has said these images were exposed for 0.55 milliseconds each.

by **RickyM** » Wed Apr 10, 2019 7:24 pm

high frame rate digital camera. A total of 2500 frames were recorded during the 7 minute long visible ISS passage

5.95 fps is not a high frame rate.

by **BDanielMayfield** » Sat Apr 06, 2019 11:52 pm

Odysseus wrote: ↑Sat Apr 06, 2019 11:08 pm
BDanielMayfield wrote: ↑Sat Apr 06, 2019 10:27 pm
Odysseus wrote: ↑Sat Apr 06, 2019 4:36 pm
Not a 3D image, but I made this from images 2 and 3:

You could use those to convince some that it stays in orbit by flapping its solar panel wings.
Yeah, the more I look at this GIF, the more it looks like the solar panels are stretching and squishing.

And no wonder astronauts get motion sickness!

P. S. Welcome to the forum Odysseus.

Bruce

by **Boomer12k** » Sat Apr 06, 2019 11:10 pm

Really nice job!!!

:---[===] *

by **Odysseus** » Sat Apr 06, 2019 11:08 pm

BDanielMayfield wrote: ↑Sat Apr 06, 2019 10:27 pm
Odysseus wrote: ↑Sat Apr 06, 2019 4:36 pm
orin stepanek wrote: ↑Sat Apr 06, 2019 10:54 am I wonder if a couple of the images could be used to make a 3-D image!
Not a 3D image, but I made this from images 2 and 3:

You could use those to convince some that it stays in orbit by flapping its solar panel wings.

Yeah, the more I look at this GIF, the more it looks like the solar panels are stretching and squishing.

by **BDanielMayfield** » Sat Apr 06, 2019 10:27 pm

Odysseus wrote: ↑Sat Apr 06, 2019 4:36 pm
orin stepanek wrote: ↑Sat Apr 06, 2019 10:54 am I wonder if a couple of the images could be used to make a 3-D image!
Not a 3D image, but I made this from images 2 and 3:

You could use those to convince some that it stays in orbit by flapping its solar panel wings.

by **geckzilla** » Sat Apr 06, 2019 10:18 pm

dl martin wrote: ↑Sat Apr 06, 2019 4:51 pm Given the expansion of man's intellectual penetration of the Universe, night it be reasonable to stop referring to ISS as a space station.

nope.

by **BDanielMayfield** » Sat Apr 06, 2019 6:56 pm

dl martin wrote: ↑Sat Apr 06, 2019 4:51 pm Given the expansion of man's intellectual penetration of the Universe, night it be reasonable to stop referring to ISS as a space station.

What's wrong with calling it a space station? It is stationed in space, people live and work in it full time, spacecraft doc with it, etc.

by **Odysseus** » Sat Apr 06, 2019 5:31 pm

dl martin wrote: ↑Sat Apr 06, 2019 4:51 pm Given the expansion of man's intellectual penetration of the Universe, night it be reasonable to stop referring to ISS as a space station.

Would you prefer "Habitable Artificial Satellite"? The HAS.

by **dl martin** » Sat Apr 06, 2019 4:51 pm

Given the expansion of man's intellectual penetration of the Universe, night it be reasonable to stop referring to ISS as a space station.

by **Odysseus** » Sat Apr 06, 2019 4:36 pm

orin stepanek wrote: ↑Sat Apr 06, 2019 10:54 am I wonder if a couple of the images could be used to make a 3-D image!

Not a 3D image, but I made this from images 2 and 3:

by **Cousin Ricky** » Sat Apr 06, 2019 4:28 pm

by **eaglekepr** » Sat Apr 06, 2019 3:49 pm

Re: the last question, yes. The ISS makes one rotation per orbit so the cupola is always aimed at the Earth except for specific reasons when they temporarily change the orientation.

There's a number of us amateur astro imagers on Twitter that manually track ISS passes with telescopes then post images or sequences from the pass. This last week as pretty good for viewing from the UK and Western Europe with high altitude passes just after dusk. Here's a couple of mine from last weekend:

https://twitter.com/Eaglekepr/status/11 ... 4819196940
https://twitter.com/Eaglekepr/status/11 ... 1875963911

Those sequences were from around 250 DSLR frames, processed with software to crop and align on the ISS, rejecting any "misses" and frames where it blurred too much, then put into an animation. Total used frames was about 150 from the pass.

by **APODFORIST** » Sat Apr 06, 2019 3:02 pm

The rotation is interesting.

A question in principle: Does the ISS rotate once around itself while orbiting the earth, so always the same side - e.g. that of the Cupola - points downwards towards the earth?

by **BDanielMayfield** » Sat Apr 06, 2019 1:54 pm

Nitpicker wrote: ↑Sat Apr 06, 2019 6:01 am Very sharp. ...

Respect. Lucky imaging indeed.

Agreed. Even though 96% of his shots missed his target altogether, it is still remarkable that he was able to find and track such a small and rapidly moving target by hand well enough that even a few shots had no motion blurr. Viva the 4%.

by **neufer** » Sat Apr 06, 2019 12:40 pm

Click to play embedded YouTube video.

orin stepanek wrote: ↑Sat Apr 06, 2019 10:54 am
I wonder if a couple of the images could be used to make a 3-D image!

Drop down from full screen and
reduce the top two images to make a cross-eyed 3-D image.

https://www.youtube.com/watch?v=n99iNW9595o

by **orin stepanek** » Sat Apr 06, 2019 10:54 am

I wonder if a couple of the images could be used to make a 3-D image!

Starship Asterisk*

APOD: ISS from Wallasey (2019 Apr 06)

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