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Developments in Astrometry and Their Impact on Astrophysics and Geodynamics - Proceedings of the 156th Symposium of the International Astronomical Union Held in Shanghai, China, September 15-19, 1992 (Paperback, Softcover reprint of the original 1st ed. 1993)
Loot Price: R2,835
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Developments in Astrometry and Their Impact on Astrophysics and Geodynamics - Proceedings of the 156th Symposium of the International Astronomical Union Held in Shanghai, China, September 15-19, 1992 (Paperback, Softcover reprint of the original 1st ed. 1993)
Series: International Astronomical Union Symposia, 156
Expected to ship within 18 - 22 working days
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In this review talk, I would like to report on the proper motion
analysis, which has been recently carried out together with M. Soma
and M. Yoshizawa: There has been a persistent demand in astronomy
for accurate stellar positions and proper motions, which are
represented by an inertial reference system constructed on the
basis of a set of consistent astronomical constants. In the
reference system the precessional constant plays a primary role. In
a series of papers Fricke (1967a, b, 1977a, b) has deter mined the
luni-solar precessional correction to Newcomb's value and the
fictitious motion of the equinox, which have been adopted in the
"IAU (1976) System of Astronomical Con stants." Based on the
precessional correction and the equinoctial motion thus
established, the fundamental reference system, the FK5 system
(Fricke et al. 1988) for positions and proper motions, has been
constructed. However, for several years geodetic VLBI (McCarthy
& Luzum 1991) and LLR (Williams et at. 1991) observations have
been suggesting an additional correction to the luni-solar
precessional constant of the IAU (1976) System. That is, these
observations indicate the precessional correction of 6. p -0:
'30/cent to the FK5 system. But, the observational period ofthe
earth orientation is considered to be still insufficient to
separate unambiguously the precessional change of the earth
orientation from the nutation with the longest period of 18. 6
years."
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