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Table 27

Spectral reference systems.

Value Definition

TOPOCENT Topocentric
GEOCENTR Geocentric
BARYCENT Barycentric
HELIOCEN Heliocentric
LSRK Local standard of rest (kinematic)
LSRD Local standard of rest (dynamic)
GALACTOC Galactocentric
LOCALGRP Local Group
CMBDIPOL Cosmic microwave background dipole
SOURCE Source rest frame

Notes. These are the allowed values of the SPECSYSa, SSYSOBSa, and SSYSSRCa keywords.

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