Linked Questions
24 questions linked to/from How do SDP4's "Deep space" corrections to SGP4 account for the Sun's and Moon's gravity?
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Is TESS really lost? What does Celestrak mean exactly?
From this answer to the question What artificial satellite has the farthest orbit around the Earth?:
I found the following "far out" spacecraft:
TESS (Transiting Exoplanet Survey Satellite)...
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5
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1
answer
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How can Earth-Centered Inertial (ECI) coordinates be properly called "inertial" if the Earth's orbit is always accelerating towards the Sun?
I've just realized (again) that I don't understand anything, something that often happens to me after reading a @DavidHammen answer.
How can Earth-Centered Inertial (ECI) coordinates be inertial if ...
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3
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2
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SGP4 on Systems Tool Kit (STK); how to check if SDP4 deep space correction is implemented?
I am doing orbit propagation for a geostationary satellite which requires the deep space corrections of SDP4. See my previous question SGP 4 for Geostationary Satellite.
I am using SGP4 on STK, but, ...
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6
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SGP 4 for Geostationary Satellite
I have read some sources that say that SGP4 is for satellite which have orbital period less than 225 minutes. For orbital period more than 225 minutes, we should use SDP4 instead.
I need a ...
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1
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1
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Why can't custom-made TLEs for the DSCOVR launch booster in orbit around Earth work with SDP4?
This fascinating answer to Why has no TLE been published for the DSCOVR satellite and the Falcon 9 R/B? presents links to custom-made TLEs for the Falcon 9 rocket body that put DSCOVR into orbit, and ...
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3
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1
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Confused about SGP4 implementation published by celestrack
I was trying to understand how SGP4 computes the propagated position I had a look on the original publication paper but i have not found a satisfactory answer.
So I had a look to the Matlab ...
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1
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2
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Can the deactivated satellites also be tracked through TLE?
TLE is used to track whether the satellites are in orbit or not. However, is it possible that a particular satellite is deactivated, decommissioned or deorbited yet its TLE is being updated regularly?
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7
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Textbook or scholarly discussion of equations used by the SDP4 part of SGP4 TLE propagators beyond Space Track Report #1?
(the famous) Space Tract Report #3 discussed at length in Dr. T.S. Kelso's Revisiting Spacetrack Report #3, AIAA 2006-6753 Describes the "deep space" corrections to the original SGP4 known ...
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0
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Cis-L2 Libration Point Halo Orbit
Queqiao became the first satellite to orbit the Cis-L2 libration point (far side of the moon). Link: https://en.wikipedia.org/wiki/Chang%27e_4
Does anyone have any insight on how to model this orbit ...
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