numeph 0.1.0

Convert JPL SPK ephemeris to numpy array

Author: Behrouz Safari
License: MIT

numeph

Convert JPL SPK ephemeris to numpy array

Installation

Install the latest version of numeph from PyPI:

pip install numeph

Requirements are numpy and jplephem

Save some segments from 'de440s.bsp' from 2020 to 2030:

from datetime import datetime
from numeph import save_segments

t1 = datetime(2020, 1, 1)
t2 = datetime(2030, 1, 1)

save_segments(in_file='de440s.bsp',
              out_file='de440s_2020_2030.pickle',
              t1=t1,
              t2=t2,
              segs_tup=[(0,10), (0,3), (3,399), (3,301)])

get position of an object from a segment:

from datetime import datetime
from numeph import get_pos

t = datetime.utcnow()

pos = get_pos(file='de440s_2020_2030.pickle',
              seg_tup=(0,3), # Earth Barycenter wrt SSB
              t=t)

get geocentric position of an object:

from datetime import datetime
from numeph import geocentric

t = datetime.utcnow()

pos = geocentric(target='moon', file='de440s_2020_2030.pickle', t=t)

See more at astrodatascience.net