Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976aj.....81..127f&link_type=abstract
Astronomical Journal, vol. 81, Feb. 1976, p. 127-131. Research supported by the Fundacao de Amparo a Pesquisa do Estado de Sao P
Astronomy and Astrophysics
Astronomy
3
Astronomical Photography, Ephemeris Time, Europa, Io, Natural Satellites, Time Measurement, Astrometry, Dynamic Models, Error Analysis, Jupiter (Planet), Least Squares Method, Tables (Data)
Scientific paper
All available series of photographic observations of the four great satellites of Jupiter made in the period 1930-1970 are discussed. It is shown that the time scale of Sampson's tables (ST) departs significantly from the ephemeris time. The formula ST-ET equals 0.006(t - 1900.0) min is a good representation for this difference. Two methods for the determination of the shift of Sampson's time scale are discussed; the superiority of the individual time scales method is shown. The quality of the available series is discussed. The high quality of the series observed by Petrescu in 1934 and of that observed by Pascu in 1968 is confirmed.
de Paula L. R.
Ferraz-Mello Sylvio
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