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IAUC 8622: P/2000 QJ_46; 2005hf

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                                                  Circular No. 8622
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 QJ_46 (LINEAR)
     An apparently asteroidal discovery by the LINEAR project
(discovery observation below from MPS 18126) has been reported now
by M. Solontoi and A. West (Astronomy Department, University of
Washington; with assistance by D. Schlelgel) as having a cometary
appearance (with a coma and a very faint, short tail) on Sloan
Digital Sky Survey 2.5-m telescope (Apache Point, NM) frames from
2000 Sept. 3 and 4; the unpublished SDSS astrometry is added below;
the comet showed the following SDSS magnitudes on Sept. 3.27 UT:
u = 19.6, g = 18.0, r = 17.4, i = 17.2, z = 17.1.

     2000 UT             R.A. (2000) Decl.       Mag.   Observer
     Aug. 24.27007   22 34 38.81   - 8 24 11.5   18.5   LINEAR
     Sept. 3.26725   22 30 05.10   - 9 24 26.4          SDSS
           4.38530   22 29 33.65   - 9 31 21.3            "

The following orbital elements are from MPO 13685:

                    Epoch = 2001 Apr.  1.0 TT
     T = 2000 Dec. 10.3467 TT         Peri. = 222.9660
     e = 0.673150                     Node  = 158.2344  2000.0
     q = 1.933644 AU                  Incl. =   4.3757
       a =  5.915996 AU    n = 0.0684955    P =  14.39 years


SUPERNOVA 2005hf
     R. Quimby, P. Hoeflich, S. J. Kannappan, and J. C. Wheeler,
University of Texas; and C. Gerardy, Imperial College, report the
discovery of a supernova (at mag about 16.7) in unfiltered CCD
images taken on Oct. 25.12 UT using the 0.45-m ROTSE-IIIb telescope
at the McDonald Observatory.  The new object, found by subtracting
a co-addition of images taken between July 16 and Sept. 12
(limiting mag about 18.9), is located at R.A. = 1h27m05s.97, Decl.
= +19o07'00".5 (equinox 2000.0; uncertainty +/- 0".5), which is
1".9 west and 1".5 north of the apparent host galaxy.  A
spectrogram (range 420-890 nm) of SN 2005hf, obtained on Oct. 25.35
with the 9.2-m Hobby-Eberly Telescope (+ Marcario Low-Resolution
Spectrograph) by J. Caldwell and E. Terrazas, shows it to be a
type-Ia supernova near maximum light.  In addition to Si II 635.5-
nm, S II 545.4- and 564.0-nm, and weak Ca II infrared absorption
features, fairly strong Na I absorption is detected that is
consistent with the NED recession velocity of 12924 km/s (from
Maurogordato et al. 1997, A.Ap. Suppl. 123, 411).

                      (C) Copyright 2005 CBAT
2005 October 25                (8622)            Daniel W. E. Green

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