Starship Asterisk*

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.
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Screenshot 2022-09-03 091521.png

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?

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.

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 :?:

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

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.