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1 vote
1 answer
590 views

Why doesn't a full/gibbous moon high in the sky ever seem to look orange? Shouldn't it? [closed]

The question Why does the Moon appear gray when passing between the Sun and the Earth? shows the famous "Moon photobombs Earth" image of the moon in front of the Earth taken from the EPIC camera on DS …
3 votes
1 answer
165 views

Are there Starlink train-finding websites?

In Astronomy SE Line of lights moving in a straight line, with a few following is the canonical close as duplicate target for questions about the likely seeing of recently deployed Starlinks that move …
9 votes
3 answers
2k views

Why would Mars' sky appear blue at dawn and dusk, but red during the middle of the day (reve...

After reading the really interesting question and discussion Terrestrial Exoplanet Skies – I've Built a Visual Sky Chart. Is it Accurate? I was reminded that in this video at 40:20 Elon Musk mentions …
2 votes
0 answers
89 views

Why does Gravity Simulator's rendering of TESS' orbit look like a pretzel? How can I unpretz...

Below is a screen shot from the amazing Gravity Simulator driven by our own @HappyKoala. If you haven't seen it recently go check it out now, then come back in 30 minutes and read the rest of my quest …
10 votes
1 answer
2k views

Is this plot of deep space trajectories correct? Did most launch retrograde from Earth? Why ...

This answer contains some nice plots of deep space spacecraft trajectories. Noticing that Voyage 2's heliocentric velocity dropped substantially just before 1990 I wanted to see why. Wikipedia's Voyag …
4 votes
3 answers
576 views

Why does Earth not appear to be at the focus of TESS' elliptical orbit in this video?

An excellent review of all of the considerations and work that has gone into designing TESS' orbit can be read in the ArXiv preprint A High Earth, Lunar Resonant Orbit for Lower Cost Space Science Mis …
3 votes
1 answer
456 views

Trying to understand the two "holes" in this alt/az plot of the ISS

I'm plotting the position of satellites in the sky using Skyfield. If I project the .altaz() data on to a rectangle (in a similar fashion to the way ground track lat/lon plots are made) I get two big …
2 votes
2 answers
422 views

What is the extra moving and disappearing line in the animation in the BulgariaSat-1 webcast?

In the SpaceX BulgariaSat-1 Launch Webcast there is a 3D animation of the orbits/trajectories of the first and second stage showing most of the Earth. There is a blue line that starts out over Florida …
2 votes
1 answer
882 views

Is GMAT still available? Where? How? (NASA's General Mission Analysis Tool)

In this comment below the question Visualization of non-Keplerian orbits for solar sails, NASA's open source General Mission Analysis Tool is suggested. Sounds great! …