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Title:
Comet Halley orbit optimum determination by means of ground-based astrometric observations and on-board observations from the 'Vega' spacecraft
Authors:
Bakhshiian, B. Ts.; Iastrzhembskii, I. A.
Affiliation:
AA(AN SSSR, Institut Kosmicheskikh Issledovanii, Moscow, USSR), AB(AN SSSR, Institut Kosmicheskikh Issledovanii, Moscow, USSR)
Publication:
(COSPAR, IAU, IAGA, and IAA, Plenary Meeting, 26th, Symposium on Comets Halley and Giacobini-Zinner, 12th, Toulouse, France, June 30-July 11, 1986) Advances in Space Research (ISSN 0273-1177), vol. 5, no. 12, 1985, p. 181-183. (AdSpR Homepage)
Publication Date:
00/1985
Category:
Astronomy
Origin:
STI
NASA/STI Keywords:
ASTROMETRY, HALLEY'S COMET, ORBIT CALCULATION, SPACE OBSERVATIONS (FROM EARTH), SPACEBORNE ASTRONOMY, VEGA PROJECT, ASTRONOMICAL MODELS, LEAST SQUARES METHOD
DOI:
10.1016/0273-1177(85)90084-5
Bibliographic Code:
1985AdSpR...5..181B

Abstract

To determine the orbit of comet Halley the following data were used: (1) Astrometric observations of the comet performed in 1835 - 1836, 1910 - 1911, 1985 - 1986 which are right ascensions and declinations of the comet at the given times relative to the earth mean equator and equinox of 1950.0. About 10000 of such measurements were chosen. Standard deviations of these observation errors are assumed to be: 2arcsec.8 - 5arcsec.5 in 1835; 1arcsec.5 - 3arcsec.0 in 1910 and 1arcsec.0 in 1986. (2) Measurements of the cometary angular position relative to the "VEGA" on-board coordinate system performed on the 6th and on the 9th of March 1986 during three hours of comet fly-by. Standard deviations of these measurement errors are assumed to be 1arcmin.0.
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