Central Bureau for Astronomical Telegrams
IAUC 3503: Occn BY URANUS; ABELL 46
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Circular No. 3503
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
OCCULTATION BY URANUS
P. Bouchet, European Southern Observatory, reports observations
by C. Perrier, B. Sicardy and himself of the occultation by
Uranus and its rings of star 12 in the list by Klemola and Marsden
(1977, A.J. 82, 849). Observations were made in the K band using
the 3.6-m telescope at La Silla. The occultation by Uranus itself
lasted from Aug. 15d22h37m15s +/- 5s to 16d00h16m03s +/- 5s UT.
Occultations by the known rings and seven additional occultations (here
labeled a through g) were timed as follows:
Pre-immersion Post-emersion
Event 1980 Aug. UT d f 1980 Aug. UT d f
6 15d22h11m16s6 0s50 0.24 16d00h45m58s5 0s45 0.24
5 15 22 10 21.0 0.50 0.32 16 00 46 50.2 0.40 0.47
4 15 22 09 50.3 0.40 0.31 16 00 47 31.1 0.40 0.35
alpha 15 22 05 25.0 0.55 0.74 16 00 51 51.2 1.20 0.60
beta 15 22 03 27.0 0.80 0.54 16 00 53 41.7 1.50 0.35
eta 15 22 00 23.1 0.40 0.17 16 00 56 41.6 0.45 0.27
gamma 15 21 59 28.5 0.50 0.54 16 00 57 35.2 0.60 0.89
delta 15 21 58 07.0 0.50 0.71 16 00 58 55.4 0.45 0.71
a 16 00 59 55.9 0.25 0.30
b 16 01 01 54.1 0.30 0.28
epsilon 16 01 04 41.0 8.05 0.96
c 16 01 46 30.2 0.45 0.33
d 16 02 01 27.0 0.70 0.59
e 16 02 05 54.8 0.40 0.27
f 16 02 06 59.2 0.50 0.25
g 16 02 23 48.1 0.50 0.30
The times are outer edge for pre-immersion, inner edge for post-emersion.
d = duration. f = fractional depth.
ABELL 46
W. A. Feibelman, Goddard Space Flight Center, reports that IUE
observations of the eclipsing-binary nucleus of Abell 46 (IAUC 3480)
by McCracken, Boggess, Hobbs and himself on July 8 show a hot
component at ~ 6 x 10**4 K when corrected for interstellar reddening.
Mid-exposure of the SWP spectrogram was at phase 0.92, according to
an ephemeris supplied by H. E. Bond. Both SWP and LWR spectrograms
indicate a continuum without emission or absorption lines.
Observations at primary eclipse are planned for the near future.
1980 August 18 (3503) Brian G. Marsden
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