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IAUC 5964: 1994I; 1993a

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                                                  Circular No. 5964
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 1994I IN NGC 5194
     A. V. Filippenko, T. Matheson, and A. J. Barth, University of
California at Berkeley, report:  "CCD spectra (range 310-990 nm)
obtained on Apr. 4.4 UT with the Shane 3-m reflector at Lick
Observatory suggest that SN 1994I might be of type Ib rather than
type II (cf. IAUC 5962), although the possible presence of weak H-
alpha would technically make it 'type IIb' (cf. SN 1987K; Filippenko
1988, A.J. 96, 1941).  The continuum drops quite steeply towards
blue and near-ultraviolet wavelengths, unlike the case in most
young type-II supernovae, but similar to the continua of type-Ib
supernovae.  Other aspects of the spectrum also support the type-Ib
classification; in particular, lines of He I seem to be unusually
strong, although this is not necessarily inconsistent with a young
type-II object.  Strong, narrow Na I D and Ca II H+K absorption
lines suggest that the object is substantially reddened."
     G. C. L. Aikman and D. D. Balam, Dominion Astrophysical
Observatory, report photometry obtained with the 1.82-m Plaskett
telescope:  Apr. 3.18 UT, V = 13.74 +/- 0.06, B-V = +0.463, V-R =
+0.134 (based on photometry by H. Corwin for the star given as
'135' on Thompson and Bryan's Supernova Search Chart for NGC 5194:
V = 13.44, B-V = +0.61, U-B = +0.09, V-Rc = +0.36).  The effects of
galaxy contamination were minimized by isophotal fitting and model
galaxy subtraction.
     Visual magnitude estimates:  Apr. 1.25 UT, [14 (J. Leonard,
Anza, CA); 2.27, - (P. Schwaar, Phoenix, AZ; independent visual
discovery); 2.62, 14.2 (Y. Fujita, Kuma-Kogen Observatory,
independent CCD discovery).


COMET MUELLER (1993a)
     Ephemeris from orbital elements on MPC 23105:

1994 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Apr.  8    22 54.67   - 1 02.0   2.959   2.199   33.9   14.7   10.3
     18    23 00.47   - 2 49.8   2.891   2.258   42.7   17.6   10.3
     28    23 05.20   - 4 50.9   2.800   2.321   52.1   20.0   10.4
May   8    23 08.64   - 7 10.9   2.692   2.388   61.9   21.9   10.4
     18    23 10.48   - 9 56.1   2.570   2.458   72.2   23.1   10.5
     28    23 10.29   -13 13.0   2.443   2.531   83.2   23.4   10.5
June  7    23 07.56   -17 07.4   2.317   2.606   94.8   22.8   10.5
     17    23 01.59   -21 43.0   2.204   2.684  107.0   21.2   10.5


1994 April 4                   (5964)            Daniel W. E. Green

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