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IAUC 5085: 1990c; P/ENCKE

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IAUC number 

                                                  Circular No. 5085
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


COMET LEVY (1990c)
     The improved orbital elements below, by S. Nakano, are from MPC
16841; the corresponding 1/a = -0.000288 +/- 0.000065 AU**-1.  The
undersigned has determined the 'original' and 'future' barycentric values to
be +0.000352 and -0.000522, respectively, suggesting that, contrary to
earlier speculations, this is not a 'new' comet in the Oort sense.

                    Epoch = 1990 Nov.  5.0 ET
     T = 1990 Oct. 24.6954 ET         Peri. = 242.6797
     e = 1.000270                     Node  = 138.6637  1950.0
     q = 0.938581 AU                  Incl. = 131.5856


PERIODIC COMET ENCKE
     The orbital elements below, published by S. Nakano on NK 545
(OAA Computing Section Circ.), supersede those on MPC 12577.  The
nongravitational parameters are A1 = +0.02, A2 = -0.0023.

                    Epoch = 1990 Nov.  5.0 ET
     T = 1990 Oct. 28.5665 ET         Peri. = 186.2450
     e = 0.850220                     Node  = 334.0406  1950.0
     q = 0.330885 AU                  Incl. =  11.9391
       a =  2.209148 AU    n = 0.3001698    P =   3.284 years

     1990 ET      R.A. (1950) Decl.     Delta      r       m1
     Aug. 27     5 08.15    +34 17.6    1.166    1.317    11.2
     Sept. 1     5 36.14    +35 13.8
           6     6 08.64    +35 49.3    0.996    1.167    10.1
          11     6 46.08    +35 50.6
          16     7 28.30    +35 00.2    0.866    1.007     9.0
          21     8 14.17    +33 00.2
          26     9 01.55    +29 39.7    0.800    0.835     8.1
     Oct.  1     9 47.94    +25 02.2
           6    10 31.43    +19 26.3    0.824    0.653     7.5
          11    11 11.31    +13 17.8
          16    11 48.16    + 6 58.0    0.949    0.469     7.3

     Total visual magnitude estimates: Aug. 19.49 UT, 12.5: (C. S.
Morris, Pine Mountain Club, CA, 0.26-m reflector); 24.45, 11.1 (A. Hale,
Las Cruces, NM, 0.41-m reflector); 25.43, 11.2 (Hale); 30.46, 11.0
(Hale); 31.35, 10.8 (J. Bortle, Stormville, NY, 0.31-m reflector).


1990 September 1               (5085)              Brian G. Marsden

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