User Bill Gray - Space Exploration Stack Exchange

Bill Gray

Member for 4 years, 8 months
Last seen more than 1 year ago

11 Answers

Score Activity Newest

9 votes

Accepted

What is the basic mechanics behind the way the orbits of the twelve Vela spacecraft evolved over decades?

answered Sep 19, 2018 at 16:23

8 votes

Accepted

Is TESS really lost? What does Celestrak mean exactly?

answered Apr 18, 2019 at 1:35

7 votes

Differences between SGP8 and the standard SGP4? Is it ever used in practice?

answered Apr 18, 2019 at 1:53

7 votes

What artificial satellite has the farthest orbit around the Earth?

answered Dec 16, 2019 at 5:20

7 votes

Accepted

Why can't custom-made TLEs for the DSCOVR launch booster in orbit around Earth work with SDP4?

answered May 26, 2021 at 1:32

5 votes

Accepted

Has a TLE ever been issued for a spacecraft trajectory not bound to Earth orbit?

answered Apr 15, 2019 at 18:02

4 votes

Where is Vela 1A? Is there any information what its orbit would be like now?

answered Sep 20, 2018 at 0:33

4 votes

In a 3D space defined by semimajor axis, eccentricity and inclination, what would be the shape of the space where SDP4 works better than SGP4?

answered May 30, 2021 at 1:17

4 votes

What is/was legacy TLE ephemeris type 2? (TLE, line 1, column 63)

answered Nov 29, 2020 at 0:56

3 votes

Why has no TLE been published for the DSCOVR satellite and the Falcon 9 R/B?

answered Apr 15, 2019 at 18:09

2 votes

Why does OGO-1's trajectory and imminent reentry come from sky surveys and NEO tracking rather than normal satellite tracking?

answered Aug 30, 2020 at 15:36