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IAUC 7577: P/2000 Y10; 2001B

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                                                  Circular No. 7577
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)
CBAT@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)


COMET P/2000 Y10 (MUELLER 4)
     S. Nakano, Sumoto, Japan, reports the recovery of P/1992 G3
(= 1992g = 1992 IV) by T. Oribe (Saji Observatory) on CCD images
taken with a 1.03-m reflector, with the astrometry given below.
The comet is faint and of stellar appearance on 2000 Dec. 22 (m_2 =
20.5).  The indicated correction to the orbital elements on MPC
31663 (ephemeris on MPC 41213) is Delta(T) = +0.23 day.

     2000/01 UT          R.A. (2000) Decl.        m1
     Dec. 22.84689   13 16 40.36   + 7 38 25.1
          22.85209   13 16 40.80   + 7 38 26.1
          22.85765   13 16 41.34   + 7 38 27.5
          22.86251   13 16 41.83   + 7 38 27.0
     Jan. 30.83403   14 06 40.26   +11 45 20.1   19.6
          30.83750   14 06 40.45   +11 45 22.0
          30.84167   14 06 40.68   +11 45 24.9

     Nakano provides the following orbital elements from 35
observations, 1992-2001 (mean residual 0".8):

                    Epoch = 2001 Feb. 20.0 TT
     T = 2001 Feb.  7.8847 TT         Peri. =  43.6165
     e = 0.388590                     Node  = 145.3691  2000.0
     q = 2.646731 AU                  Incl. =  29.7486
       a =  4.328900 AU    n = 0.1094304    P =   9.007 years


SUPERNOVA 2001B IN IC 391
     R. Chornock and A. V. Filippenko, University of California at
Berkeley, report that inspection of fully calibrated CCD spectra
(range 330-1000 nm) of SN 2001B (cf. IAUC 7555), obtained on Jan.
23 UT with the Shane 3-m reflector at Lick Observatory, reveals
that the object is probably a type-Ib supernova, roughly one week
past maximum brightness (not type-Ia, as reported on IAUC 7563).
The spectrum exhibits well-developed absorption lines of He I, as
well as an unidentified absorption line near 625 nm, similar to
one seen in SN 2000dt (cf. IAUC 7511).

                      (C) Copyright 2001 CBAT
2001 February 1                (7577)            Daniel W. E. Green

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