Right ascension corrections to 120 FK 4-stars by the analysis of time observations obtained with the Photoelectric Transit Instrument at Torino Observatory

Details Right ascension corrections to 120 FK 4-stars by the analysis of time observations obtained with the Photoelectric Transit Instrument at Torino Observatory Right ascension corrections to 120 FK 4-stars by the analysis of time observations obtained with the Photoelectric Transit Instrument at Torino Observatory

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...183..403c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 183, no. 2, Sept. 1987, p. 403-410.

Astronomy and Astrophysics

Astrophysics

Electrophotometry, Orbital Elements, Spectrum Analysis, Stellar Orbits, Stellar Spectrophotometry, Temporal Distribution, Astrometry, Astronomical Catalogs, Error Analysis

Scientific paper

Right ascensions corrections to 120 FK 4-stars have been calculated by the analysis of Time observations obtained with the Photoelectric Transit Instrument at Torino Observatory in the period 1980.3-1985.3. The method performed at Torino Observatory has been based both on internal adjustment of the stars in each group, by a method of successive approximations (Yokoyama, 1968), and on the simultaneous determination of group corrections and local seasonal variations through a least-squares solution according to the model proposed by Feissel (1980). The mean error of the corrections Δa has proved to be better than Os.O04 for most stars. Systematic deviations as a function of right ascension, declination and magnitude have been preliminary derived. The reduction of Time observations with the revised star positions have been accomplished and an improvement in weight of 1.76 times on internal adjustment and 1.30 times on external agreement with respect to the uncorrected data series has been obtained.

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