The Celestial Reference Frame

Details The Celestial Reference Frame The Celestial Reference Frame

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999vlbi.rept...18m&link_type=abstract

International VLBI Service for Geodesy and Astrometry: 1999 Annual Report, p. 18

Astronomy and Astrophysics

Astronomy

1

Celestial Reference Systems, Very Long Base Interferometry, Extragalactic Radio Sources, Astrometry, Geodesy

Scientific paper

The conceptual basis of reference frames defined by extragalactic objects is straightforwaxd: that the universe as a whole does not rotate so very distant objects cannot have an overall rotational motion. Experimentally, the global rotation of the universe is less than 10-12 arcsecond/yr as inferred from the 3K microwave background radiation. At the distance of 108 parsecs, even if an object were moving transversely at the speed of light, its angular velocity would be less than 0.6 x 10-3 arcsecond/yr, while an object moving at a physically more reasonable speed comparable to the Sun would show a motion of 10-6 arcsecond/yr, entirely undetectable by current technology. Since neither systematic universal motion nor random motion at such great distance is measurable, it is reasonable to construct a static celestial reference frame on the basis that such objects axe fixed in the sky.

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