Table 12: Recognized values for SPECSYS a, SSYSOBS a, and SSYSSRC a.
Value Definition Magnitude $\ell$ b Reference
TOPOCENT Topocentric 0.0 km  s-1 - -  
GEOCENTR Geocentric 0.5 - -  
BARYCENT Barycentric 30 - - Stumpff (1980)
HELIOCEN Heliocentric 30 - - Stumpff (1980)
LSRK Local standard of rest (kinematic) 20 $\dag $ 56 23 Delhaye (1965), Gordon (1976)
LSRD Local standard of rest (dynamic) 16.6 53 25 Delhaye (1965)
GALACTOC Galactocentric 220 90 0 Kerr & Lynden-Bell (1986)
LOCALGRP Local Group 300 90 0 de Vaucouleurs (1976)
CMBDIPOL Cosmic microwave background dipole 368 263.85 48.25 Bennett et al. (2003)
SOURCE Source rest frame any - -  
$\dag $ LSRK is normally quoted as right ascension 18 hours, declination 30 degrees (1900).


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