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IAUC 5902: N Cas 1993; 1993s

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                                                  Circular No. 5902
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)


NOVA CASSIOPEIAE 1993
     S. Nakano, Sumoto, Japan, reports the discovery by Kazuyoshi
Kanatsu, Matsue, Shimane, of a nova on a T-Max 400 exposure with a
55-mm f/2.8 lens on Dec. 7, with confirmation by the discoverer on Dec. 11.
K. Kawanishi, Akou, Hyogo, has determined the position to be
R.A. = 23h39m22s.36, Decl. = +57d14'23".7 (equinox 1950.0).  Magnitude
estimates: Dec. 5.44 UT, [10.0 (A. Tago, Tsuyama, Okayama; T-Max);
7.47, 7.5 (Tago); 7.47, 6.5 (Kanatsu); 11.42, 6.5 (Kanatsu); 11.63, 6.5
(S. Otomo, Kiyosato, Yamanashi; visual); 11.63, 6.4 (T. Urata, Shimizu,
Shizuoka; unfiltered CCD); 11.65, 6.4 (K. Tomita, Tokyo; visual).


PERIODIC COMET MUELLER 5 (1993s)
     Further precise positions have been reported as follows:

     1993 UT             R.A. (2000) Decl.        m1    Observer
     Dec. 10.40873    6 51 29.67   +21 28 58.0          Scotti
          10.41679    6 51 29.42   +21 28 59.3   17.4     "
          10.42585    6 51 29.13   +21 29 00.6   17.5     "
          10.44653    6 51 28.55   +21 29 08.3   18     Mueller

J. V. Scotti (Lunar and Planetary Laboratory).  0.91-m Spacewatch
   telescope, Kitt Peak.  m2 = 20.6.  Coma diameter 8", 0'.43 tail
   in p.a. 312 deg.
J. Mueller, D. J. Griffith and J. D. Mendenhall (Palomar).  1.2-m Oschin
   telescope.  Comet less than 4 cm from edge of Sky Survey plate.

     An orbit computation from the 15 observations Nov. 20-Dec. 10
confirms that the comet is of short period:

     T = 1995 Feb. 8.153 TT           Peri. =  52.773
     e = 0.33181                      Node  = 100.572   2000.0
     q = 3.95249 AU                   Incl. =  17.104
       a =  5.91527 AU     n = 0.068508     P =  14.39 years

1993/94     R. A. (2000) Decl.     Delta      r    Elong. Phase      m1
Dec.  9     6 52.19    +21 24.8    3.543    4.454  154.8    5.4     17.7
     19     6 46.82    +21 55.6    3.471    4.433  166.3    3.0     17.7
     29     6 40.72    +22 27.9    3.430    4.413  177.9    0.5     17.6
Jan.  8     6 34.41    +23 00.1    3.420    4.393  170.4    2.1     17.6
     18     6 28.43    +23 31.2    3.442    4.373  158.8    4.7     17.6


1993 December 11               (5902)              Brian G. Marsden

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