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IAUC 6179: PKS 1622-297; JUPITER I (IO); 6P

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                                                  Circular No. 6179
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
Phone 617-495-7244/7440/7444 (for emergency use only)


PKS 1622-297
     J. R. Mattox, University of Maryland and Universities Space
Research Association; S. Wagner, Landessternwarte Heidelberg; T. A.
McGlynn, Compton Observatory Science Support Center; M. Malkan,
University of California, Los Angeles; J. F. Schachter, Harvard-
Smithsonian Center for Astrophysics; and P. Sreekumar, Goddard
Space Flight Center, on behalf of the the Compton Observatory EGRET
Team, communicate:  "We report the EGRET detection of quasar PKS
1622-297.  The flux at E > 100 MeV during June 6-11 was at least an
order of magnitude higher than upper limits obtained in previous
observations.  The EGRET observation is scheduled to continue until
July 5.  Observations at other wavelengths may be of great value.
This object is in the night sky, but only 17 deg from the galactic
center.  The NASA/IPAC Extragalactic Database gives an optical
magnitude of 20.5 (and extinction of 1.00 B magnitude) and a 31-GHz
flux of 2.2 Jy.  Contact mattox@astro.umd.edu for more information."


JUPITER I (IO)
     E. Lellouch, Observatoire de Paris, Meudon; G. Paubert and R.
Moreno, Institut de Radio Astronomie Millimetrique (IRAM), Granada;
D. F. Strobel, The Johns Hopkins University; and M. Belton,
National Optical Astronomy Observatories, report: "We have observed
Jupiter's satellite Io with the IRAM 30-m radiotelescope at Pico
Veleta (Spain) on May 30 and 31, and June 22-24, detecting the SO
(6,5)-(5-4) transition at 219.949 GHz on both the leading and the
trailing sides of Io.  The line properties are similar to those of
the SO2 lines observed since 1990 with the same telescope (i.e., an
antenna temperature line contrast of about 60 mK and a FWHM width
of about 0.65 MHz).  We have also obtained a likely detection of
the weaker SO (4,3)-(3-2) line at 138.179 GHz, with a line contrast
of about 20 mK.  These observations represent the first detection
of SO in the atmosphere of Io, and a preliminary interpretation
suggests an SO/SO2 relative abundance of a few percent."


COMET 6P/D'ARREST
     Total magnitude estimates:  June 19.96 UT, 16.0 (H. Mikuz,
Ljubljana, Slovenia, 0.36-m reflector + CCD + V filter); 24.42,
13.1 (A. Hale, Cloudcroft, NM, 0.41-m reflector, visual); 27.03,
13.6 (Mikuz).


1995 June 27                   (6179)            Daniel W. E. Green

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