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IAUC 8592: 2005dq, 2005dr, 2005ds; (76818) 2000 RG_79; C/2005 Q2, C/2005 Q3

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                                                  Circular No. 8592
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)


SUPERNOVAE 2005dq, 2005dr, 2005ds
     Three apparent supernovae have been reported from unfiltered
CCD images -- 2005dq by M. Armstrong (cf. IAUC 8406) and the other
two by D. R. Madison, R. R. Prasad, and W. Li (LOSS/KAIT; cf. IAUC
8590).

SN      2005 UT       R.A.  (2000.0)  Decl.    Mag.     Offset
2005dq  Aug. 30.086  22 44 46.45  +33 27 37.6  17.9   9".4 E, 0".5 S
2005dr  Aug. 29.51    5 02 17.18  + 7 38 21.4  18.5   12".0 W, 12".0 N
2005ds  Aug. 31.21   17 57 39.89  +27 50 18.4  18.7   14".4 W, 13".1 N

Additional approximate magnitudes from the respective observers:
2005dq in UGC 12177, 1991 Sept. 13, [20.8 (Palomar Sky Survey red
plate); 1992 Oct. 19, [22.5 (POSS blue plate); 2003 Sept. 21, [19.5
(Armstrong); 2005 Aug. 30.895 UT, 17.9.  2005dr in UGC 3229, 2004
Mar. 8.18, [19.5; 2005 Aug. 31.49, 18.6.  2005ds in UGC 11064, Aug.
22.21, [19.5; 26.19, [19.0; Sept. 1.20, 18.5.


(76818) 2000 RG_79
     B. D. Warner, Colorado Springs, CO; P. Pravec, Ondrejov
Observatory; and D. Pray, Coventry, RI, report that photometric
observations obtained during Aug. 7-28 show that the minor planet
(76818) is a binary system with an orbital period of 14.125 +/-
0.01 hr.  The primary rotates with a period 3.1664 +/- 0.0002 hr,
and its lightcurve amplitude of 0.14 mag is indicative of a nearly
spheroid shape.  Mutual eclipse/occultation events that are about
0.14 mag deep indicate a secondary-to-primary mean-diameter ratio
of 0.37 +/- 0.03.


COMETS C/2005 Q2 AND C/2005 Q3 (SOHO)
     Following are details on two additional comets found on SOHO
C2-coronagraph website images (cf. IAUC 8585).  C/2005 Q2 was a
Meyer-group comet, reaching a magnitude of perhaps 6.5 and
appearing stellar on all images except two or three, where it
appeared elongated.  C/2005 Q3 appears to be a non-group comet,
peaking at mag perhaps 8.5 when it first entered the field-of-view,
but then fading rapidly as it approached the sun.

 Comet       2005 UT       R.A.(2000)Decl.  Inst.  F    MPEC
 C/2005 Q2   Aug. 23.071  10 02.6   +13 16   C2    TH   2005-R06
 C/2005 Q3        30.104  10 28.3   +10 21   C2    TH   2005-R06

                      (C) Copyright 2005 CBAT
2005 September 1               (8592)            Daniel W. E. Green

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