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IAUC 9159: P/2010 C2; P/2010 P1

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IAUC number 

                                                  Circular No. 9159
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
CBAT Director:  D. W. E. Green, Room 209; Department of
 Earth and Planetary Sciences; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
CBAT@IAU.ORG; CBATIAU@EPS.HARVARD.EDU
URL http://www.cfa.harvard.edu/iau/cbat.html  ISSN 0081-0304


COMET P/2010 C2 (LINEAR)
     G. V. Williams has identified comet P/1999 XB_69 (cf. IAUC
7370) in WISE spacecraft data, the first observation tabulated here:

     2010 UT             R.A. (2000) Decl.       Observer
     Feb.  1.56490   14 30 58.74   -25 34 02.2   WISE

He subsequently identified the comet in data from the Mount Lemmon
Survey on 2008 Oct. 31.  The indicated correction to the prediction
on MPC 56804 is Delta(T) = -0.34 day.  The astrometry, the
following linked orbital elements, residuals, and an ephemeris
appear on MPEC 2010-P21:

                    Epoch = 2009 July 28.0 TT
     T = 2009 July 25.5642 TT         Peri. = 220.3245
     e = 0.630762                     Node  = 256.0531  2000.0
     q = 1.652119 AU                  Incl. =  11.3059
       a =  4.474399 AU    n = 0.1041363    P =   9.46 years


COMET P/2010 P1 (NEAT)
     Apparently independent recoveries of comet P/2002 X2 (cf. IAUC
8029) have been reported, with the initial CCD astrometry by H.
Taylor (Rayle, GA, U.S.A., 25-cm reflector), by H. Sato (Tokyo,
Japan; remotely, 25-cm reflector, RAS Observatory, Mayhill, NM,
U.S.A.; 20" coma and 30" tail in p.a. 260 deg), by L. Elenin
(Lyubertsy, Russia; remotely, 45-cm f/2.8 astrograph, ISON-NM
Observatory, Mayhill; 50" tail), and by T. Yusa (telescope data
same as for Sato; faint 25" tail in p.a. 252 deg) given below.  K.
Kadota (Ageo, Japan, 25-cm reflector) reports coma diameter 0'.5
and a 0'.6 tail in p.a. 250 deg on Aug. 11.70 UT.

     2010 UT             R.A. (2000) Decl.       Mag.   Observer
     Aug.  9.3714     4 51 42.54   +12 21 44.5   17.3   Taylor
          10.43490    4 53 39.71   +12 30 08.8   16.9   Sato
          11.42507    4 55 28.79   +12 37 55.9   17.5   Elenin
          11.45540    4 55 32.15   +12 38 10.6   16.8   Yusa

The indicated correction to the prediction by S. Nakano (ICQ 2009/
2010 Comet Handbook, p. 108) is Delta(T) = -0.63 day.  The
following linked orbital elements by Williams appear on MPEC
2010-P51:  Epoch 2010 Oct. 11.0 TT, T = 2010 Oct. 4.2693 TT, q =
2.123840 AU, e = 0.450033, Peri. = 351.9236 deg, Node = 74.9749
deg, i = 23.5227 deg, (equinox 2000.0), P = 7.59 years.

                      (C) Copyright 2010 CBAT
2010 August 11                 (9159)            Daniel W. E. Green

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