Central Bureau for Astronomical Telegrams
IAUC 5347: SNe; 1991o; Sats OF SATURN AND NEPTUNE
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Read IAUC 5348
Circular No. 5347
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
SUPERNOVAE
A. V. Filippenko and T. Matheson, University of California at
Berkeley, report that CCD spectra (range 390-710 nm, resolution 1 nm)
of several recent supernovae were obtained on Sept. 16 UT with the
Shane 3-m reflector at the Lick Observatory. SN 1991ar is probably of
type II, but the P-Cygni profile of Na D is much more prominent than
that of H alpha or H beta. They confirm that SNe 1991as, 1991at and
1991au are of types Ia, Ia and probably II, respectively. SN 1991av
is of type II, but the spectrum is peculiar: strong, relatively narrow
Balmer emission lines, and weaker He I 587.6-nm emission, are
superposed on a nearly featureless blue continuum; the spectrum
resembles that of SN 1991ae (cf. IAUC 5287, 5294).
PERIODIC COMET CHERNYKH (1991o)
J. Luu, Harvard-Smithsonian Center for Astrophysics; and D.
Jewitt, Institute for Astronomy, University of Hawaii, communicate:
"We have discovered that P/Chernykh has split. Observations with the
2.4-m telescope of the Michigan-Dartmouth-MIT Observatory on Sept. 15
and 16 show that the secondary nucleus is separated from the primary
by 56".6 +/- 0".7 in p.a. 71 +/- 1 deg. Both primary and secondary
objects appear extended. The Mould R magnitudes of the primary and
secondary are 16.1 and 19.1, respectively, measured within an
11".7-diameter diaphragm. Neither the separation nor the difference
in magnitudes changed between nights."
SATELLITES OF SATURN AND NEPTUNE
The IAU Executive Committee has approved the following new
designations and names:
Saturn XVIII Pan = 1981 S13
Neptune III Naiad = 1989 N6
Neptune IV Thalassa = 1989 N5
Neptune V Despina = 1989 N3
Neptune VI Galatea = 1989 N4
Neptune VII Larissa = 1989 N2
Neptune VIII Proteus = 1989 N1
The satellites of Neptune are numbered in order of increasing distance
from the primary.
1991 September 16 (5347) Brian G. Marsden
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