rest frame

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rest frame

The frame of reference for a distant or moving object that would appear to have zero velocity when observed from that object. Observed radiation has to be corrected for redshift to convert its emission to the intrinsic rest frame of the object, and this is known as a k-correction .
Collins Dictionary of Astronomy © Market House Books Ltd, 2006

rest frame

[′rest ‚frām]
(relativity)
The Lorentz frame in which the total momentum of a system equals zero; for an accelerated system, the rest frame varies from instant to instant.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.