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IAUC 5922: 1994a; N Cas 1993

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                                                  Circular No. 5922
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)


PERIODIC COMET KUSHIDA (1994a)
     The following additional precise positions have been reported:

     1994 UT             R.A. (2000) Decl.       Observer
     Jan. 11.63889    9 47 24.17   + 2 43 01.5   Verveer
          12.66042    9 47 50.88   + 2 33 44.4   Smith
          13.98907    9 48 21.03   + 2 22 02.4   Casulli
          13.99198    9 48 20.99   + 2 22 00.4     "

A. Verveer and T. Smith (Perth).  0.3-m astrograph.
V. S. Casulli and S. Valentini (Colleverde di Guidonia).

     Orbital calculations suggest that this is indeed a short-
period comet, the following elements being from 29 observations,
Jan. 9-13:

     T = 1993 Dec. 12.993 TT          Peri. = 214.706
     e = 0.63365                      Node  = 245.781   2000.0
     q = 1.36606 AU                   Incl. =   4.167
       a =  3.72881 AU     n = 0.136883     P =   7.20 years

1994 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Jan.  8     9 45.38   + 3 19.8   0.499   1.399  139.2   27.4   10.9
     18     9 49.39   + 1 53.0   0.499   1.429  147.3   21.9   11.0
     28     9 49.36   + 1 13.0   0.511   1.467  156.1   15.8   11.2
Feb.  7     9 46.82   + 1 15.6   0.538   1.511  164.6   10.0   11.4
     17     9 43.67   + 1 49.7   0.581   1.562  168.8    7.0   11.8
     27     9 41.68   + 2 39.7   0.643   1.619  164.5    9.4   12.1


NOVA CASSIOPEIAE 1993
     A. D. Scott and A. Evans, Keele University; and T. Geballe,
Joint Astronomy Centre, write:  "Spectra obtained on Jan. 10 with
the U.K. Infrared Telescope (+ cooled grating spectrometer CGS4) in
the K and L bands show that C I at 3.378 microns is comparable in
strength with Pa-delta, as occurred in the dusty nova V842 Cen.
The first overtone vibrational-rotational bands of 12CO remain
strong (IAUC 5916), and there is evidence in the L band for 'PAH'-
like features at 3.34, 3.4, and 3.46 microns; such features, also
seen in V842 Cen (Wichmann et al. 1991, Infrared Spectral Regions
of Stars), may arise from nucleation sites for carbon dust and
suggest that the visual light curve of this nova will shortly enter a
deep minimum."


1994 January 14                (5922)            Daniel W. E. Green

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