Central Bureau for Astronomical Telegrams
IAUC 5328: 1991ap ACTUALLY QSO; SATURN; 1991n
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Circular No. 5328
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM EASYLINK 62794505
MARSDEN or GREEN@CFA.BITNET MARSDEN or GREEN@CFAPS2.SPAN
SUPERNOVA 1991ap ACTUALLY QSO
A. V. Filippenko, T. Matheson, F. Paerels, and C. Mauche,
University of California at Berkeley, report: "A CCD spectrum (range
390-710 nm, resolution 1 nm) obtained on Aug. 20 UT with the Shane
3-m reflector at Lick Observatory shows that SN 1991ap is actually a
QSO. The redshift is 1.143, as determined from the Mg II 279.8-nm
and C III] 190.9-nm emission lines, which are superposed on a
featureless blue continuum."
SATURN
R. L. Baron, NASA Infrared Telescope Facility and Institute for
Astronomy, University of Hawaii; and T. Owen, Institute for Astronomy,
University of Hawaii, communicate: "We report the first detection
of discrete regions of thermal emission on Saturn in the wavelength
range 4.9-5.3 microns. These features are seen in a narrow
(+/- 5 deg) latitude band centered at about +15 deg. A small number
of more widely spaced features appeared at -5 deg latitude. The
observations were made on July 8/9 with the ProtoCAM instrument on the
IRTF, using a CVF to provide 1.8-percent resolution throughout the
4.5- to 5.3-micron window. These features have a rotational period
consistent with the nominal Saturnian rotation period of 10.2 hr
determined from equatorial cloud motions observed in visible light.
Strong limb darkening causes the features to disappear before reaching
the edge of the visible disk. Similar observations of Jupiter
do not show this limb darkening effect at these wavelengths."
PERIODIC COMET FAYE (1991n)
B. Suzuki, Koshigaya High School; H. Kurihara, Kanagawa
Industrial High School; H. Watanabe, Tokyo Gakugei University; and J.
Watanabe, National Astronomical Observatory of Japan, report CCD
observations of this comet, using the 1.88-m reflector of Okayama
Astrophysical Observatory (+ IHW CN, C2, and corresponding continuum
filters), on Aug. 13, 14, and 15. Each frame clearly shows a dust
tail of length about 1' in p.a. 240 to 355 deg, with the brightest
part at p.a. 240 to 260 deg.
Total visual magnitude estimates (cf. IAUC 5325): Aug. 17.00
UT, 12.7 (B. H. Granslo, Fjellhamar, Norway, 0.20-m reflector);
17.98, 12.1 (J. Jahn, Bodenteich, Germany, 0.20-m reflector); 20.42,
12.5 (A. Hale, Las Cruces, NM, 0.41-m reflector).
1991 August 21 (5328) Daniel W. E. Green
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