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Results tagged with skyfield
Search options questions only
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user 12102
6
votes
2
answers
6k
views
Time, UTC, Julian Date, TLE epoch - how are they related quantitatively?
I print additional information to make sure I understand some things - the questions are in bold:
Example 1 - time on my computer and in Skyfield:
from skyfield.api import now, JulianDate, load
import …
- 151k
3
votes
1
answer
5k
views
Better way to get approximate ground track for a satellite using Skyfield?
I wanted to make a quick ground-track plot, so I used the Python package Skyfield to propagate a TLE and return Earth-Centered Inertial coordinates. … EDIT: I've adjusted the script since it's been over a year and Skyfield v 1.0 has been released. …
- 151k
55
votes
3
answers
11k
views
Is 75 meters an exceptionally close distance for two satellites to pass at >6,000 m/s?
I plugged them into Skyfield and sure enough, at about 17 seconds after 2016-12-15 13:14:00 UTC it shows them passing about 100 meters from each other at 6,674 m/s relative velocity. … estimated times of page loadings before screen shootings) and the predicted distance of closest approach has changed from 0.075 kilometers to 0.113 kilometers, which is precisely the value I get from Skyfield …
- 151k
14
votes
4
answers
21k
views
How to obtain UTC of the epoch time in a satellite TLE (two line element)?
The current difference can also be shown with Skyfield:
from skyfield.api import JulianDate
jd = JulianDate(utc=(2016,1,1))
print jd.tt, "days"
print jd.tt % 1, "day fraction"
print ((jd.tt % 1) - 0.5 …
- 151k
4
votes
3
answers
531
views
Asteroid 2013 TX68 March 5, 2016 close approach, and calculating with Skyfield
I tried to load DE431 into Skyfield out of curiosity to see if I can learn how to use these kinds of solutions (which can include substantial uncertainty sometimes) but I was stopped immediately by an … And, more broadly, how to start using orbital solutions of asteroids in Skyfield? …
- 151k
4
votes
1
answer
650
views
How to (correctly) rotate this data so the Ecliptic is in the XY plane?
When plotting orbits using the Python package Skyfield, the coordinates are barycentric ICRS. …
- 151k
2
votes
2
answers
550
views
Ephemeris for lunar body-centered body-fixed coordinates?
I'm familliar with getting Ephemeris type data from JPL Horizons and from Skyfield, both of which use the JPL Development Ephemerides (e.g. …
- 151k
3
votes
2
answers
406
views
Why can n2yo somehow interpret this TLE but Skyfield can't? Why does it return nans and zero...
Right now it looks like this TLE is so unphysical that it's outside of Skyfield version 1.41's ability to interpret. … Stay tuned, since n2yo can do it, some newer version of Skyfield might be able to as well.
Question: Why can n2yo somehow interpret this TLE but Skyfield can't? …
- 151k
21
votes
3
answers
26k
views
How can I plot a satellite's orbit in 3D from a TLE using Python and Skyfield?
How can I calculate the orbit from the TLE, and then plot it in 3D, using Python and the Skyfield package? …
- 151k
9
votes
1
answer
5k
views
How to get earth-centered, earth-fixed coordinates from Skyfield?
I recently started using Skyfield (python) to find (x, y, z) coordinates of things in space. … However, I'm wondering if there is an "official" Earth-fixed (rotating) frame, and if Skyfield has a method to convert to it, or to any rotating frame in general? …
- 151k
6
votes
1
answer
518
views
Need help getting the true ICRF coordinates of SOHO using Horizons
In this answer I calculated the approximate angular separation between Mercury and the Sun as seen by the SOHO satellite using Skyfield's method of .ecliptic_position() because I couldn't get true ICR …
- 151k
5
votes
1
answer
332
views
Was the time of Schiaparelli's landing chosen specifically so the Giant Meter Wave Radiotele...
above: altiude and azimuth of Mars as seen from the GMRT in Pune, India calculated using Skyfield note: the light time delay is about 10 minutes. …
- 151k
3
votes
1
answer
570
views
JPL Horizons original reference orbit data for Juno - how to retrieve now that it's been upd...
Because of the slow helium valve responses, Juno was not instructed to execute the large delta-v maneuver to drop from the ~53 day orbit to the ~14 day orbit originally scheduled for 2016-Oct-19.
I'd …
- 151k
8
votes
2
answers
2k
views
Does it even make sense to talk about Mercury's triangular libration points (L4, L5)?
below: python script and results using the package Skyfield. Dots in last plot are at years = 2024.14 when Venus comes closer than Mercury. …
- 151k
3
votes
0
answers
260
views
How to get lunar L, B, C parameters from the Moon's 3x3 rotation matrix from the Python pack...
describes two Python methods in the Skyfield package that provide either the latitude and longitude parameters (L, B) or a 3x3 rotation matrix. …
- 151k