Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1968
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1968natur.219..474t&link_type=abstract
Nature, Volume 219, Issue 5153, pp. 474-475 (1968).
Astronomy and Astrophysics
Astronomy
11
Scientific paper
As part of a systematic programme for the prediction of occultations of stars by planets, attention was called in 1967 to the rare possibility of an occultation (on April 7, 1968) by Neptune (magnitude 7.7, apparent diameter 2''.4) of the star B.D. -17° 4388 (magnitude 7.8). Photographic observations of the relative positions of Neptune and the star at the Royal Greenwich Observatory on March 14, 1968, confirmed this possibility and enabled reliable predictions to be given for this unique opportunity for determining the diameter of the planet. The two existing principal determinations are those of Barnard1, in 1899-1900 (52,900 km = 2''.43 at the mean distance of 30.06 astronomical units), and of Camichel2 in 1953, using a double image micrometer (45,000 km = 2''.07).
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