Central Bureau for Astronomical Telegrams
IAUC 3699: Occn BY (146); 1980b; NOTICE TO SUBSCRIBERS
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Circular No. 3699
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 (146) LUCINA
With further reference to the reports on IAUC 3692, of the
Apr. 18 occultation, D. W. Dunham, International Occultation Timing
Association, informs us that C. Schnabel, located at Barcelona (Long. =
-2o08'07", Lat. = +41o24'28", h = 140 m), noted an occultation from
20h21m28s.0 +/- 0s.1 to 20h21m34s.0 +/- 0s.3 UTC; conditions were generally
fair to good. On the other hand, R. Casas, observing from Sabadell
(Long. = -2o06'20", Lat. = +41o32'52", h = 220 m), 14 km from Barcelona,
detected no occultation, although transparency was poor.
J. Lecacheux, Meudon Observatory, telexes that measurement by
W. Thuillot, J.-E. Arlot and himself of selected video frames
recorded with the l-m reflector (f/21) at Meudon give the closest
approach of (146) Lucina to the star AGK3 +17 1309 (BD +17 2516) as
0".70 +/- 0".20 (south) at 20h20m21s +/- 20s UT; this could be consistent
with the Spanish observations given above. It now appears that the
5.5-s event at CERGA's Calern station was a spurious effect from
the tracking computer. The 0.5-s extinction observed at Meudon, if
real, was due to some secondary body situated 1".5 +/- 0".2 from the
primary, in p.a. 60o +/- 7o.
COMET BOWELL (1980b)
P. D. Feldman, Johns Hopkins University; M. F. A'Hearn, University
of Maryland; and R. L. Millis, Lowell Observatory, report that
an IUE spectrogram was obtained of the comet on Apr. 27 at heliocentric
distance 3.39 AU. A 5.5-hr exposure shows both continuum
(260-320 nm) and OH (0-0) band emission. A Haser model fit to the
OH brightness yields a production rate near 1 x 10**28 s**-1. Ground-based
photometry on Apr. 28 yields a somewhat higher production
rate, as well as a production rate for the previously identified CN
emission of 7 x 10**25 s**-1. This appears to be the largest
heliocentric distance at which OH has been detected in a comet, and the
production rate is remarkably high for this distance.
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1982 May 28 (3699) Brian G. Marsden
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