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IAUC 5170: 1991B; 1991b; 1990i

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IAUC number 

                                                  Circular No. 5170
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 1991B IN NGC 5426
     A. V. Filippenko, University of California at Berkeley (UCB),
reports that M. Dickinson, A. Dey, and D. Schlegel (UCB) obtained a
CCD spectrum (range 400-800 nm, resolution 2 nm) of SN 1991B on Jan.
17 UT with the Shane 3-m reflector at Lick Observatory.  Inspection
of the uncalibrated data confirms that the object is of type Ia (cf.
IAUC 5164), probably about 3-4 weeks past maximum.


COMET ARAI (1991b)
     Prediscovery images of this comet (m1 about 10) were found on
films exposed 1990 Dec. 23 by T. Ohtsuka and T. Kojima, Tatebayashi,
Gunma, Japan.  The following improved parabolic orbital elements by
S. Nakano, Sumoto, Japan, are from MPC 17596:

     T = 1990 Dec. 11.070 ET          Peri. = 337.762
                                      Node  = 114.841   1950.0
     q = 1.43596 AU                   Incl. =  71.119

     1991 ET      R.A. (1950) Decl.     Delta      r       m1
     Jan. 14     8 31.71    +30 33.1    0.544    1.516    10.5
          19     8 14.35    +40 30.6
          24     7 54.72    +48 42.1    0.633    1.566    11.0
          29     7 33.73    +54 59.2
     Feb.  3     7 12.65    +59 35.7    0.787    1.627    11.6
           8     6 52.84    +62 53.0
          13     6 35.48    +65 12.1    0.975    1.697    12.2
          18     6 21.39    +66 50.2
          23     6 10.91    +68 00.4    1.176    1.773    12.8
          28     6 04.03    +68 51.9
     Mar.  5     6 00.50    +69 30.7    1.383    1.856    13.4


COMET TSUCHIYA-KIUCHI (1990i)
     Total visual magnitude estimates (cf. IAUC 5148):  1990 Dec.
18.80 UT, 8.9 (A. Pearce, Scarborough, W.A., 20x80 binoculars); 1991
Jan. 8.13, 9.4 (A. Hale, Tucson, AZ, 0.41-m reflector); 13.23, 10.2
(C. S. Morris, Pine Mountain Club, CA, 0.26-m reflector).


1991 January 18                (5170)             Daniel W. E. Green

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