Questions tagged [spice]

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SPICE GFPOSC is returning incorrect sunrise (and sunset) times for topocentric frames

I cannot get SPICE to produce accurate sunrise times for topocentric frames I specify. I'm using spiceypy to interface with SPICE. As a first test, I set up topo coordinates for the MARE landing site,...
3
votes
0answers
53 views

How to get MSL coordinates during EDL from SPICE kernel?

Upon trying to extract MSL position above surface by decoding a SPICE kernel, I am gettin this error: At epoch 3.9750216818313E+08 TDB (2012 AUG 06 05:16:08.183 TDB), there is insufficient ...
3
votes
0answers
105 views

Suggestion for software which allows orbit data generation under different conditions (such as J2, ATM drag etc)

I am an amateur astrophysics enthusiast trying to generate orbit data. What I want to achieve: I want to be able to generate orbits while only considering effects of (J2, J3, atm drag, solar ...
2
votes
0answers
28 views

Lunar eclipses using SPICE toolkit, missing ephemeris data

I want to figure out lunar eclipses as seen from a point on the Moon using SPICE. To generate ephemeris for the point on the Moon, I use the code provided in this answer. Instead of ...
2
votes
0answers
25 views

determining lunar eclipse with SPICE toolkit

Is there any way to determine if the Sun is visible from the Moon at a given latitude/longitude and at a given instant in SPICE toolkit? Specifically, determine if there is lunar eclipse or transit ...
1
vote
0answers
181 views

How to define a body-centered ICRF/J2000 frame in SPICE?

I am trying to define a reference frame in SPICE that is Centered on a particular body, for example Mars, and with axes parallel to J2000/ICRF After going through the required reading for reference ...