Central Bureau for Astronomical Telegrams
IAUC 5924: 1993N; 1993e; 1994a
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Circular No. 5924
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@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)
SUPERNOVA 1993N IN UGC 5695
A. V. Filippenko and T. Matheson, University of California at
Berkeley, write: "CCD spectrograms (range 310-1000 nm) obtained on
Jan. 7 and 19 UT with the 3-m Shane reflector at Lick Observatory
show that the type-II supernova 1993N is indeed similar to SN 1988Z,
as previously suspected from the early-time spectrum (cf. IAUC
5788). The dominant feature is H-alpha emission, with FWHM about
1800 km/s and its centroid blueshifted by 500-600 km/s relative to
the parent galaxy's systemic velocity of 2900 km/s. Weak H-beta
and H-gamma emission are also visible above the faint continuum.
By analogy with SN 1988Z and its close cousin SN 1986J, the ejecta
of SN 1993N are interacting with a dense circumstellar wind. It is
probable that SN 1993N will become a luminous x-ray and radio
source within the next few years. Having less than half the
distance of SN 1988Z, and having been discovered far earlier in its
evolution than SN 1986J, SN 1993N offers an unprecedented opportunity
to learn more about this rare but interesting subclass of type-
II supernovae."
PERIODIC COMET SHOEMAKER-LEVY 9 (1993e)
D. Jewitt and J. Chen, University of Hawaii, report images of
this comet obtained on Jan. 14 UT using the UH 2.2-m telescope on
Mauna Kea. Under 0".8 seeing, the 'string of pearls' morphology of
the comet persists, with significant changes in the relative
brightnesses of some components. The most notable change, however, is
the near-disappearance of the dust sheet previously observed in
extension to the north-east and south-west of the line of nuclei. In
addition, individual tails from the separate nuclei have become
more apparent, indicating persistent release of dust from these
nuclei. The longest tail (from nucleus 7) is in excess of 1' along
p.a. 295 deg.
COMET KUSHIDA (1994a)
Total visual magnitude estimates: Jan. 12.25 UT, 10.8 (A.
Hale, near Orogrande, NM, 0.20-m reflector); 12.93, 12.3 (K.
Sarneczky, Veresegyhaz, Hungary, 0.33-m reflector); 13.96, 11.6 (T.
Vanmunster, Landen, Belgium, 0.35-m reflector); 16.25, 11.1 (G.
Kronk, Troy, IL, 0.33-m reflector); 18.03, 10.6 (G. Comello,
Groningen, The Netherlands, 0.20-m reflector).
1994 January 20 (5924) Daniel W. E. Green
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