A python package for querying NASA's JPL HORIZONS API
Project description
Author: Behrouz Safari
License: MIT
hypatie
A python package for querying NASA's JPL HORIZONS API
Installation
You can install the latest version of hypatie from PyPI:
pip install hypatie
The only requirement is numpy.
How to use
Let's get the positions of the sun between two times:
import hypatie as hp
t1 = '2021-03-20 08:00:00'
t2 = '2021-03-20 10:00:00'
If you want the apparent RA and DEC of the Sun with respect to Earth (geocentric):
obs = hp.Observer('sun', t1, t2, step=5)
Now you can access the time intervals with .time attribute:
print(obs.time)
[datetime.datetime(2021, 3, 20, 8, 0)
datetime.datetime(2021, 3, 20, 8, 24)
datetime.datetime(2021, 3, 20, 8, 48)
datetime.datetime(2021, 3, 20, 9, 12)
datetime.datetime(2021, 3, 20, 9, 36)
datetime.datetime(2021, 3, 20, 10, 0)]
To acces the position you can use obs.pos, obs.ra, or obs.dec:
print(obs.pos)
[[ 3.59938235e+02 -2.66803120e-02]
[ 3.59953431e+02 -2.00920520e-02]
[ 3.59968627e+02 -1.35038600e-02]
[ 3.59983823e+02 -6.91573600e-03]
[ 3.59999018e+02 -3.27680000e-04]
[ 1.42132560e-02 6.26030600e-03]]
The first column in the above array is RA and the second column is DEC.
You can request the cartesian positions (x,y,z) of a target with Vector class.
vec = hp.Vector('sun', t1, t2, step=5)
As with the Observer class, there are two attributes .time and .pos for Vector class. Note the when creating a Vector class, you have .x, .y and .z attributes instead of .ra and .des.
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