The program calc-star-coords calculates heliocentric and geocentric coords at given UT or Julian date using input ICRF coords or name (sambaed lookup), proper motion, and parallax.

Usage: Calculates heliocentric, geocentric coords at given date/jd using input ICRF coords/name, proper motion, parallax

Program calc-star-coords


  --version            show program's version number and exit

  -h, --help           show this help message and exit

  -S Star name         Object name: SIMBAD lookup, specify or use -r,d

  -r RA (J2000,ICRF)   Right ascension (J2000) heliocentric

  -d Dec (J2000,ICRF)  Declination (J2000) heliocentric

  -p Parallax          Parallax (mas)

  -m Proper motion     Annual proper motion (mas, mas)

  -j Julian date       Julian date, specify or use -D

  -D Date              UT date [format: yyyy-mm-dd hh:mm:ss]

Example usage:

DEIMOS:~> calc-star-coords -S HR1099 -p 34.2 -m 179,63 -D '2017-01-11 14:00:00'

Object: HR1099

Proper motions: 179.00 mas/yr, 63.00 mas/yr, Parallax: 34.20 mas

Parallax corrections at observing date: (-26.81 mas, -12.28 mas)

UT date: 2017-01-11 14:00:00.000 (JD 2457765.083)

  Date            JD                             Heliocentric                                    Geocentric


2000-01-01  2451545.000    03:36:47.290 +00:35:15.933    03:36:47.289 +00:35:15.920

2017-01-11  2457765.083    03:36:47.494 +00:35:17.006    03:36:47.492 +00:35:16.993

© Robert Mutel 2018