[IAUC] IAUC 9207: P/2011 J1; 250P; T Pyx [25139-2011/04-R1]

[quai en eps.harvard.edu]

                                                  Circular No. 9207
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
New postal address:  Hoffman Lab 209; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
CBATIAU en EPS.HARVARD.EDU           ISSN 0081-0304
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Prepared using the Tamkin Foundation Computer Network


COMET P/2011 J1 (LINEAR)
     J. V. Scotti, Lunar and Planetary Laboratory, University of
Arizona, reports his recovery of comet P/2004 HC_18 (cf. IAUC 8333)
as a diffuse object on CCD images taken with the Spacewatch 1.8-m
f/2.7 reflector; he measured a coma diameter of 8" on May 1.5 UT.

     2011 UT             R.A. (2000) Decl.       Mag.
     May   1.46653   22 05 53.26   +10 58 01.4   21.5
           1.47591   22 05 54.10   +10 58 10.4   21.1
           1.48312   22 05 54.82   +10 58 16.6   21.8
           2.46608   22 07 27.24   +11 13 09.0
           2.47355   22 07 27.92   +11 13 16.3   21.4
           2.48116   22 07 28.58   +11 13 22.9
           5.46622   22 12 03.62   +11 58 16.1
           5.47351   22 12 04.24   +11 58 22.6
           5.48135   22 12 04.96   +11 58 29.0

The indicated correction to the prediction in the ICQ 2010/2011
Comet Handbook is Delta(T) = -0.10 day.  The following linked
orbital elements by G. V. Williams are from 312 observations,
2004-2011 (cf. MPEC 2011-J26).

                    Epoch = 2010 Dec. 30.0 TT
     T = 2010 Dec. 29.4978 TT         Peri. =  30.9835
     e = 0.509077                     Node  = 219.4856  2000.0
     q = 1.714018 AU                  Incl. =  23.4930
       a =  3.491416 AU    n = 0.1510782    P =   6.52 years


COMET 250P/LARSON
     Comet P/2011 A1 (cf. IAUC 9191) has been assigned the
permanent numeral designation 250P based on 1995 Dec. 22 and 2004
Feb. 29 Spacewatch observations identified by S. Nakano and on 2002
Oct. 9 and 29 NEAT observations identified by M. Meyer (cf. MPEC
2011-F21).


T PYXIDIS
     Visual magnitude estimates by A. Pearce, Nedlands, W.
Australia (cf. IAUC 9206):  Apr. 18.516 UT, 7.6; 18.588, 7.6;
19.600, 7.6; 21.588, 7.4; 25.532, 7.6; 29.565, 7.2; May 1.573, 7.0;
2.543, 7.0; 4.566, 6.8.

                      (C) Copyright 2011 CBAT
2011 May 5                     (9207)            Daniel W. E. Green