APOD: Sun and Moon and ISS (2022 Sep 03)

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APOD: Sun and Moon and ISS (2022 Sep 03)

Post by APOD Robot » Sat Sep 03, 2022 4:06 am

Image Sun and Moon and ISS

Explanation: On August 25 Sun and Moon could both be seen in planet Earth's daytime skies. And so could the International Space Station. The ISS crossed the disk of the waning crescent Moon as seen from Shunyi district, Beijing, China at about 11:02 am local time. Some 40 kilometers to the southwest, in Fengtai district, the ISS was seen to cross the Sun's disk too. The solar transit was observed only 29 seconds later. Both transits are compared in these panels, composed of processed and stacked video frames from the two locations. The coordinated captures were made with different equipment, but adjusted to show the Sun and Moon at the same scale. The ISS was at a calculated range of 435 kilometers for the lunar transit and 491 kilometers when passing in front of the Sun.

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Ann
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Re: APOD: Sun and Moon and ISS (2022 Sep 03)

Post by Ann » Sat Sep 03, 2022 9:39 am

The Moon is yellower than the Sun! Just saying!
ZME Science wrote:

I won’t even try to tell you how some regolith and mineral particles on the moon are orange. Instead, here’s an actual discussion that took place on the moon between the crewmen of Apollo 17, Commander Eugene Cernan, Lunar Module Pilot Harrison Schmitt, and Command Module Pilot Ronald Evans.

145:26:15 Cernan: O-kaay! O-kaay.

145:26:22 Schmitt: Oh, hey! (Very brief pause)

145:26:25 Schmitt: Wait a minute…

145:26:26 Cernan: What?

145:26:27 Schmitt: Where are the reflections? I’ve been fooled once. There is orange soil!!

145:26:32 Cernan: Well, don’t move it until I see it.

145:26:35 Schmitt: (Very excited) It’s all over!! Orange!!!

145:26:38 Cernan: Don’t move it until I see it.

145:26:40 Schmitt: I stirred it up with my feet.

145:26:42 Cernan: (Excited, too) Hey, it is!! I can see it from here!

145:26:44 Schmitt: It’s orange!

145:26:46 Cernan: Wait a minute, let me put my visor up. It’s still orange!

145:26:49 Schmitt: Sure it is! Crazy!

145:26:53 Cernan: Orange!

145:26:54 Schmitt: I’ve got to dig a trench, Houston.

145:27:00 Parker: Copy that. I guess we’d better work fast.

The yellow-orange coloration is usually owed to hydrated iron oxide on Earth, but on the moon, researchers now believe it is owed to volcanic glass beads.

Ann
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orin stepanek
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Re: APOD: Sun and Moon and ISS (2022 Sep 03)

Post by orin stepanek » Sat Sep 03, 2022 1:17 pm

I thought it was made of green cheese! :mrgreen:
IssSunspot_Letian_1080.jpg
Neat! Looks like a fly crawling across an Orange! :shock:
To me the ISS kinda looks like a box kite!
ISSlunartransit110320closeup1024.jpg
ISS above the moon! 9actually, below the moon
Interval29seconds_Transit1200.jpg
Crossing both the Sun and the Moon!
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Smile today; tomorrow's another day!

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Re: APOD: Sun and Moon and ISS (2022 Sep 03)

Post by revloren » Sat Sep 03, 2022 2:27 pm

Two questions:

If this was a 'coordinated capture', why did they need to be 40 kilometers apart :?:

How did the ISS change altitude from 435 kilometers away to 491 kilometers away in just 29 seconds :?:

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Chris Peterson
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Re: APOD: Sun and Moon and ISS (2022 Sep 03)

Post by Chris Peterson » Sat Sep 03, 2022 2:41 pm

revloren wrote: Sat Sep 03, 2022 2:27 pm Two questions:

If this was a 'coordinated capture', why did they need to be 40 kilometers apart :?:
Because the ISS did not cross both bodies from the same location. It was because they shadow lines were about 40 km apart that the exposures needed to be coordinated.
How did the ISS change altitude from 435 kilometers away to 491 kilometers away in just 29 seconds :?:
It didn't change altitude. It changed range (distance from the imager). Both because of the difference in time, and the difference in the location of the imagers.
Chris

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Re: APOD: Sun and Moon and ISS (2022 Sep 03)

Post by johnnydeep » Sat Sep 03, 2022 3:00 pm

Chris Peterson wrote: Sat Sep 03, 2022 2:41 pm
revloren wrote: Sat Sep 03, 2022 2:27 pm Two questions:

If this was a 'coordinated capture', why did they need to be 40 kilometers apart :?:
Because the ISS did not cross both bodies from the same location. It was because they shadow lines were about 40 km apart that the exposures needed to be coordinated.
So the ISS did not cross both the Sun and the Moon in succession when seen from either location? I'm having a hard time understanding that given that the two locations were only 40 km apart. Wouldn't both the Sun and Moon be almost exactly at the same positions in the sky when seen from either location at 11:02 am local time? And by "shadow lines" do you just mean the path of the ISS?
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Re: APOD: Sun and Moon and ISS (2022 Sep 03)

Post by Chris Peterson » Sat Sep 03, 2022 3:21 pm

johnnydeep wrote: Sat Sep 03, 2022 3:00 pm
Chris Peterson wrote: Sat Sep 03, 2022 2:41 pm
revloren wrote: Sat Sep 03, 2022 2:27 pm Two questions:

If this was a 'coordinated capture', why did they need to be 40 kilometers apart :?:
Because the ISS did not cross both bodies from the same location. It was because they shadow lines were about 40 km apart that the exposures needed to be coordinated.
So the ISS did not cross both the Sun and the Moon in succession when seen from either location? I'm having a hard time understanding that given that the two locations were only 40 km apart. Wouldn't both the Sun and Moon be almost exactly at the same positions in the sky when seen from either location at 11:02 am local time? And by "shadow lines" do you just mean the path of the ISS?
40 km is certainly enough to move you on or off the shadow path of a transit. Here is the map of the two transits. The red path (the solar transit) is passing almost through the center of Beijing. If you were along either path, you'd miss the other transit.
_
Screenshot 2022-09-03 091521.png
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johnnydeep
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Re: APOD: Sun and Moon and ISS (2022 Sep 03)

Post by johnnydeep » Sat Sep 03, 2022 4:02 pm

Chris Peterson wrote: Sat Sep 03, 2022 3:21 pm
johnnydeep wrote: Sat Sep 03, 2022 3:00 pm
Chris Peterson wrote: Sat Sep 03, 2022 2:41 pm
Because the ISS did not cross both bodies from the same location. It was because they shadow lines were about 40 km apart that the exposures needed to be coordinated.
So the ISS did not cross both the Sun and the Moon in succession when seen from either location? I'm having a hard time understanding that given that the two locations were only 40 km apart. Wouldn't both the Sun and Moon be almost exactly at the same positions in the sky when seen from either location at 11:02 am local time? And by "shadow lines" do you just mean the path of the ISS?
40 km is certainly enough to move you on or off the shadow path of a transit. Here is the map of the two transits. The red path (the solar transit) is passing almost through the center of Beijing. If you were along either path, you'd miss the other transit.
_
Screenshot 2022-09-03 091521.png
Wow - that's remarkable. To me anyway. Celestial mechanics surprises me yet again.
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