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IAUC 6695: P/1997 M2

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                                                  Circular No. 6695
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/cfa/ps/cbat.html
Phone 617-495-7244/7440/7444 (for emergency use only)


COMET P/1997 M2 (MUELLER 2)
     S. Nakano, Sumoto, Japan, reports that A. Sugie and A. Nakamura
have independently recovered comet P/1990 R1 (= 1990j = 1990 XXIV) as
shown below.  The indicated correction to the prediction by K. Muraoka
on MPC 23484 (ephemeris on MPC 29676) is Delta T = -0.26 day.

     1997 UT             R.A. (2000) Decl.        m1    Observer
     June 29.75005    0 46 50.91   +10 37 10.7   18.9   Sugie
          29.75421    0 46 51.18   +10 37 12.3            "
          29.75838    0 46 51.47   +10 37 12.7            "
     July  5.76997    0 53 51.20   +11 20 13.4   19.9   Nakamura
           5.77361    0 53 51.40   +11 20 14.6            "
           5.78924    0 53 52.43   +11 20 21.2            "

A. Sugie (Dynic Astronomical Observatory).  0.60-m f/4.0 reflector + CCD.
A. Nakamura (Kuma Kogen).  0.60-m f/6.0 Ritchey-Chretien + CCD.  Weakly
   condensed coma of diameter 15".  Possible faint tail in p.a. 260 deg.

     Improved orbital elements by Nakano from 59 observations 1990-1997:

                    Epoch = 1997 Nov.  8.0 TT
     T = 1997 Nov. 22.1998 TT         Peri. = 179.6386
     e = 0.343905                     Node  = 214.2850  2000.0
     q = 2.412127 AU                  Incl. =   7.3554
       a =  3.676490 AU    n = 0.1398151    P =   7.049 years

1997 TT     R. A. (2000) Decl.     Delta      r    Elong. Phase      m1
July  1     0 48.33    +10 46.4    2.483    2.582   84.0   23.1     19.1
     11     0 59.65    +11 55.2    2.342    2.560   90.5   23.4     18.9
     21     1 09.86    +12 55.0    2.203    2.540   97.3   23.4     18.8
     31     1 18.73    +13 44.0    2.068    2.521  104.5   22.9     18.6
Aug. 10     1 25.96    +14 20.4    1.938    2.504  112.2   22.0     18.4
     20     1 31.26    +14 42.1    1.817    2.487  120.4   20.5     18.3
     30     1 34.37    +14 47.1    1.706    2.473  129.3   18.4     18.1
Sept. 9     1 35.08    +14 33.7    1.610    2.459  138.9   15.6     17.9
     19     1 33.42    +14 00.9    1.530    2.448  149.1   12.2     17.8
     29     1 29.65    +13 09.6    1.472    2.438  160.0    8.1     17.7
Oct.  9     1 24.35    +12 02.9    1.437    2.429  171.3    3.6     17.6
     19     1 18.44    +10 47.2    1.428    2.422  175.8    1.7     17.6
     29     1 12.92    + 9 30.4    1.445    2.417  164.7    6.2     17.6

                      (C) Copyright 1997 CBAT
1997 July 6                    (6695)              Brian G. Marsden

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