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IAUC 8336: 2004bq; C/2004 B2, C2, H4,, H5; 2003 YT_1

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IAUC number

                                                  Circular No. 8336
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)

SUPERNOVA 2004bq IN ESO 597-G32
     Further to IAUC 8335, M. Moore and W. Li report the LOSS
discovery, on KAIT images taken on May 5.48 and 6.45 UT, of an
apparent supernova (mag about 17.3) located at R.A. = 20h43m58s.28,
Decl. = -20o40'25".7 (equinox 2000.0), which is 2".9 west and 8".3
north of the nucleus of ESO 597-G32.  A KAIT image taken on 2003
Oct. 28.22 UT showed nothing at this position (limiting mag about

COMETS C/2004 B2, C2, H4, AND H5 (SOHO)
     Further to IAUC 8334, K. Battams reports measurements for
additional Meyer-group comets found on SOHO C2 images by R. Kracht
(C/2004 B2 and H4), X. Leprette (C/2004 C2), and himself (C/2004
H5).  The reduced astrometry and orbital elements by B. G. Marsden
appear on MPEC 2004-J21.

    Comet         2004 UT           R.A. (2000) Decl.
    C/2004 B2     Jan. 28.913      20 47.9   -17 09
    C/2004 C2     Feb.  4.963      21 16.7   -15 10
    C/2004 H4     Apr. 16.738       1 45.4   +11 59
    C/2004 H5          30.588       2 37.4   +16 13

2003 YT_1
     M. C. Nolan, E. S. Howell, and A. A. Hine, National Astronomy
and Ionosphere Center, report:  "Arecibo radar delay-Doppler images
(2380 MHz, 12.6 cm), obtained on May 1-4, show that 2003 YT_1
(cf. MPEC 2003-Y30) is a binary system.  Preliminary estimates of
average diameters, based on range extents at 15-m and 30-m
resolution, are 1000 and 180 m.  The primary has an irregular shape
and a rotation period no longer than 2.6 hr.  The orbit appears to
be eccentric, with a period near 30 hr.  The secondary has a
rotation period no longer than 6 hr, inconsistent with synchronous
     A. Galad, S. Gajdos, L. Kornos and J. Vilagi, Modra
Observatory; and P. Pravec, Ondrejov Observatory, report that
photometric observations -- obtained on three nights during Apr.
21-29 at Modra -- show a primary rotation period of 2.343 +/- 0.001
hr and a lightcurve amplitude of 0.16 mag, which is indicative of a
roughly spheroidal shape.  A mutual attenuation event 0.15 mag deep
and 0.7 hr long was detected around Apr. 22.99 UT.

                      (C) Copyright 2004 CBAT
2004 May 6                     (8336)            Daniel W. E. Green

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