Skip to main content
Join the official 2019 Python Developers SurveyStart the survey!

A supporting module for jplephem to handle data type 1

Project description

spktype01

A supporting module for jplephem to handle data type 1 (Version 1.0.0)

This module computes positions and velocities of a celestial small body, from a NASA SPICE SPK ephemeris kernel file of data type 1 (Modified Difference Arrays). See http://naif.jpl.nasa.gov/pub/naif/toolkit_docs/FORTRAN/req/spk.html

You can get SPK files for many solar system small bodies from HORIZONS system of NASA/JPL. See https://ssd.jpl.nasa.gov/?horizons

This module reads SPK files of data type 1, one of the types of binary SPK file. At the point of Oct. 2018, HORIZONS system provides files of type 21 as binary SPK files by default. You can get type 1 binary SPK file for celestial small bodies through TELNET interface by answering back '1' for 'SPK file format'.

Modules required

  • jplephem (version 2.6 or later)
  • numpy

Usage

from spktype01 import SPKType01
kernel = SPKType01.open('path')
position, velocity = kernel.compute_type01(center, target, jd)
print(kernel)     ---- this line prints information of all segments
kernel.close()

where:
    center - SPKID of central body (0 for SSB, 10 for Sun, etc.)
    target - SPKID of target body
    jd - time for computation (Julian date)
    position - a numpy array (x, y, z)
    velocity - a numpy array (xd, yd, zd)

Modification Log

1.0.0 October 9, 2018
  • close function is added
  • stable release
0.1.0 October 10, 2016
  • beta release

Project details


Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Files for spktype01, version 1.0.0
Filename, size File type Python version Upload date Hashes
Filename, size spktype01-1.0.0-py3-none-any.whl (8.9 kB) File type Wheel Python version py3 Upload date Hashes View hashes
Filename, size spktype01-1.0.0.tar.gz (7.3 kB) File type Source Python version None Upload date Hashes View hashes

Supported by

Elastic Elastic Search Pingdom Pingdom Monitoring Google Google BigQuery Sentry Sentry Error logging AWS AWS Cloud computing DataDog DataDog Monitoring Fastly Fastly CDN SignalFx SignalFx Supporter DigiCert DigiCert EV certificate StatusPage StatusPage Status page