Central Bureau for Astronomical Telegrams
IAUC 3439: 1979l; Occn OF AGK3 +19 599 BY (65)
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Circular No. 3439
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM Telephone 617-864-5758
COMET BRADFIELD (1979l)
The following precise positions have been reported:
1979 UT R. A. (1950) Decl. Observer
Dec. 28.72222 16 13 49.34 -36 59 54.5 Herald
28.7281 16 13 48.92 -37 00 10.3 Ashley
28.7340 16 13 47.81 -37 00 23.3 "
29.72917 16 12 40.10 -37 28 15.5 Herald
29.7326 16 12 40.11 -37 28 28.1 Campbell-Wilson
30.74002 16 11 36.0 -37 58 10 Ashley
30.74520 16 11 36.1 -37 58 17 "
D. Herald (Kambah, near Canberra). First position uncertain.
M. Ashley and D. Campbell-Wilson (Mt. Stromlo Observatory). 0.23-m
reflector. Measurer: Ashley. Communicated by Herald.
J. da S. Campos, Durban, communicates the following visual
observations (0.12-m refractor, 21 x): 1979 Dec. 29.05 UT, m1 = 4.8,
1' coma with bright central condensation, well-defined 2o tail;
1980 Jan. 1.04, comet slightly brighter, 2' coma (conditions poor).
OCCULTATION OF AGK3 +19 599 BY (65) CYBELE
The following information concerning this 1979 Oct. 17 event
is extracted from a report by O. V. Dobrovol'skij, Institute of
Astrophysics, Dushanbe. Photoelectric observations at Gissar
Observatory by N. N. Kiselev, N. V. Narizhnaya and G. P. Chernova (0.7-m
reflector): disappearance, 20h44m16s.11 +/- 0s.13 UT; reappearance,
20h44m36s.04 +/- 0s.09; an additional partial phase of mean duration
0s.32 +/- 0s.2 implies an angular diameter of 0".0007 +/- 0".0004 for the
star. Very similar results were obtained visually by S. I.
Gerasimenko. Visual observations at Ura-Tyube by V. Rakhimov and
O. Najmov: disappearance, 20h44m19s.4 +/- 0s.1; reappearance, 20h44m56s.8;
a secondary event between 20h47m21s.5 +/- 0s.1 and 20h47m23s.4 is
attributed to a satellite of diameter 11 km located 917 km from the
center of (65) Cybele (if the occultation were central). Visual
observations near the Shakhristan Pass by F. A. Tup'eva apd F.
Masumi: disappearance, 20h44m11s.0 +/- 0s.1; reappearance, 20h44m55s.2.
The observations at the three sites indicate that the minor planet
has an irregular shape; the greatest observed chord (that near the
Shakhristan Pass) was 245 km long.
1980 January 4 (3439) Brian G. Marsden
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