Linked Questions

24 votes
7 answers
26k views

What are these orientations called in orbit?

Let's say a spacecraft is in an orbit like this one: If the red arrows point to prograde and retrograde, and the blue arrows point to normal and antinormal, what do the green arrows point to? In ...
Maxpm's user avatar
  • 392
15 votes
1 answer
2k views

Is this ginormous porthole a permanent feature of the ISS or "just passing through"?

This tweet from Expedition 51/52 astronaut Jack Fischer admires the great view straight down from the ginormous Russian porthole of the Progress cargo vehicle on the ISS. I don't really understand ...
uhoh's user avatar
  • 149k
9 votes
2 answers
411 views

Has an astronaut ever seen another object in LEO pass by that wasn't mission-related?

The (currently unanswered) question ISS - Tiangong 2 minimum safe distance suggests that the two space stations passed within about 12 kilometers of each other. @peterh comments that astronauts in one ...
uhoh's user avatar
  • 149k
5 votes
1 answer
1k views

How open is NASA's "open source" GMAT software?

In answers and comments to What does it mean when a software is called open-source for US-release only? I found out that when NASA uses the term "open source" it does not mean open to everyone! ...
uhoh's user avatar
  • 149k
1 vote
2 answers
1k views

Why are the ISS attitude values shown on these two web sites so different?

Here are screen captures from two sites that seem to be showing approximately live - or at least changing - telemetry from the ISS. They both say the spacecraft attitude is shown in degrees. Looking ...
uhoh's user avatar
  • 149k
7 votes
1 answer
531 views

Were there any STS missions that included maneuvers that might have photographed ISS's top side?

It looks like this answer is converging on a conclusive answer about a zenith-facing window on the ISS, and possibly also a window which might at least be able to offer a bit of a view of the zenith. ...
uhoh's user avatar
  • 149k
6 votes
1 answer
1k views

What does it mean when a software is called open-source for US-release only?

I saw this answer about MarsGRAM, and when I clicked on the NASA software link to read about it I saw at the bottom of the page a blurb for EarthGRAM 2010, an atmospheric model for Earth with likely ...
uhoh's user avatar
  • 149k
1 vote
2 answers
436 views

What is this tiny articulated dish antenna-like thing on Zvezda?

I spotted this tiny, articulated dish antenna-like thing on the Zvezda module of the ISS while looking around for images for here. It looks like it's associated with and/or pointing in the same ...
uhoh's user avatar
  • 149k
3 votes
1 answer
1k views

Where is the center of mass of the ISS relative to it's internal coordinates?

I'd like to find a fairly precise location of the center of mass of the ISS. I understand it moves for several reasons, including shifting of loads, flexing, and thermal expansion, but to say 1 meter ...
uhoh's user avatar
  • 149k
10 votes
1 answer
444 views

Has the ISS ever "flown upside down"? Has the cupola ever "looked up"?

For a spacecraft in low Earth orbit let's call the zenith direction (vector away from Earth) "up". For most of its life I think the ISS has orbited with it's "up side" pointed &...
uhoh's user avatar
  • 149k
2 votes
1 answer
375 views

How are cameras arranged and used to monitor activities outside the ISS?

Questions like Does the ISS have zenith-facing windows? and also Does the ISS have any ability to detect or sense unexpected/unscheduled objects in close proximity? have also been asked about ways to ...
uhoh's user avatar
  • 149k
1 vote
1 answer
192 views

Did anybody on the ISS photograph this partial eclipse? How long did it last? How did they safely photograph it?

Thanks to @gerrit's comment I have "irrefutable photographic circumstantial evidence" that the ISS (probably) passed through the penumbra of a partial solar eclipse. I know this is true ...
uhoh's user avatar
  • 149k
2 votes
1 answer
309 views

Is this window zenith-facing? (ISS docked Soyuz) If so, how directly?

Pursuant to the question Does the ISS have zenith-facing windows? to which the conclusion (in my opinion) is that there may be a window that provides an oblique view that might include the zenith if ...
uhoh's user avatar
  • 149k
0 votes
2 answers
299 views

Has an astronaut ever gone into a docked capsule to take a photo out one of its windows?

A discussion below this answer to Did anybody on the ISS photograph this partial eclipse? How long did it last? How did they safely photograph it? has me wondering if astronauts can ever see "up&...
uhoh's user avatar
  • 149k
1 vote
0 answers
277 views

How to estimate which astronaut ends up furthest from the ISS after one orbit?

Three astronauts; Goofus, Gallant and Zippy the Pinhead play a game. All three take their cold gas thruster-powered jet packs and quickly move 100 meters away from the ISS. For some reason after ...
uhoh's user avatar
  • 149k

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