Comparison of observations of the Galilean satellites of Jupiter made with heliometers from 1891 to 1906 with modern ephemerides

Details Comparison of observations of the Galilean satellites of Jupiter made with heliometers from 1891 to 1906 with modern ephemerides Comparison of observations of the Galilean satellites of Jupiter made with heliometers from 1891 to 1906 with modern ephemerides

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...167..371a&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 167, Oct. 1986, p. 371-378. Research supported by the Bureau des Longitudes an

Astronomy and Astrophysics

Astrophysics

2

Ephemerides, Galilean Satellites, Heliometers, Eclipses, Planetary Orbits, Space Observations (From Earth)

Scientific paper

Before 1891, most of the observations of the Galilean satellites were eclipses by the planet. Those observations were not sufficient and another technique was necessary. In 1891, large heliometers were applied to the observations of the Galilean satellites bringing accuracy to the direct observation of positions of these satellites. Several series of such observations were made but, at the same epoch, photographic observations appeared. They were less aceurate at the beginning but easier to make and since their accuracy grew up, after 1905, no more heliometric observations of the Galilean satellites were made. However, the series of heliometric observations made between 1891 and 1906 are worth studying and using to improve the ephemerides. The present work tries to show that these heliometric observations must be included among the "good" observations of the Galilean satellites. However, it shows that some instrumental systematic errors have to be removed before their utilization.

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