astronomy/generate/galactic

Test data for converting GAL/EQJ

This directory contains data generated by the JPL Horizons online tool with example conversions between equatorial J2000 (EQJ) and galactic (GAL) coordinates.

Here are the steps to reproduce this test data on JPL Horizons:

1. Ephemeris Type = OBSERVER
2. Target Body = Mars (499)
3. Observer Location = Geocentric (500)
4. Time Span: Start=2021-06-06, Stop=2031-06-06, Step=100 days
5. Table Settings: check boxes 1 (Astrometric RA, DEC) and 33 (Galactic lon, lat).
6. Also on Table Settings, change angle format to decimal degrees; airless (no refraction); enable extra precision.
7. Set Display Output to plain text.
8. Generate the data, Ctrl+A, Ctrl+C to copy to clipboard. Paste into editor. Add an extra blank line at the end, and save.

Here are the equivalent "batch file" settings:

!$$SOF
COMMAND= '499'
CENTER= '500@399'
MAKE_EPHEM= 'YES'
TABLE_TYPE= 'OBSERVER'
START_TIME= '2021-06-06'
STOP_TIME= '2031-06-06'
STEP_SIZE= '100 d'
CAL_FORMAT= 'CAL'
TIME_DIGITS= 'MINUTES'
ANG_FORMAT= 'DEG'
OUT_UNITS= 'KM-S'
RANGE_UNITS= 'AU'
APPARENT= 'AIRLESS'
SUPPRESS_RANGE_RATE= 'NO'
SKIP_DAYLT= 'NO'
EXTRA_PREC= 'YES'
R_T_S_ONLY= 'NO'
REF_SYSTEM= 'J2000'
CSV_FORMAT= 'NO'
OBJ_DATA= 'YES'
QUANTITIES= '1,33'
!$$EOF