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IAUC 8601: C/2005 R4; Var IN Her

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                                                  Circular No. 8601
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 C/2005 R4 (LINEAR)
     An apparently asteroidal object discovery by LINEAR (discovery
observation below) has been found to have a relatively bright 5"
round coma of mag 18.0-18.2 on CCD images taken by J. Young (Table
Mountain Observatory, 0.6-m f/16 Cassegrain reflector).  Young's
images from Sept. 15.4-15.5 UT also show a faint, broad, straight
16" tail in p.a. 115 deg, while his exposures from Sept. 16.5 show
a 12" broad, straight tail in p.a. 125 deg.

     2005 UT             R.A. (2000) Decl.       Mag.
     Sept.13.41100    5 49 05.83   +19 46 36.8   18.7

The available astrometry, the following preliminary parabolic
orbital elements, and an ephemeris appear on MPEC 2005-S02.

     T = 2006 Jan.  5.700 TT          Peri. = 359.387
                                      Node  =  64.073   2000.0
     q = 5.38151 AU                   Incl. = 163.875


VARIABLE IN HERCULES
     Further to IAUC 8598, T. Puckett and V. Reddy report the
discovery of a variable object (mag 16.2) on an unfiltered CCD
frame taken with the 0.60-m automated supernova patrol telescope on
Sept. 6.08 UT, the variable being located at R.A. = 17h48m05s.81,
Decl. = +34o04'01".2 (equinox 2000.0), which is near UGC 10990, and
it was also visible at mag 16.6 on Puckett's images from Sept. 7.09.
The object is visible on Palomar Sky Survey plates taken on 1992
May 5 (blue mag 19.7) and 1993 Aug. 12 (red mag 17.7).  Nothing is
visible at this location on images taken by Puckett on 2000 Apr. 18,
26, May 12, June 9, 30, 2002 Mar. 8, Apr. 6, 16, 2003 Apr. 6, 14,
and 2005 Feb. 26 (limiting mag about 20.0); however, the variable
was visible at the following magnitudes on other images taken by
Puckett:  2002 Feb. 25, 18.1; 26, 18.3; Mar. 24, 18.7; Apr. 1, 17.8;
2004 July 10, 18.2; 2005 Apr. 5, 18.0; 13, 17.8; 17, 17.4; 20, 17.1;
25, 17.5; May 8, 17.0; 14, 16.8; 19, 17.1; 26, 17.5; 29, 18.0; June
6, 17.5; 23, 17.7.  The variable object's location is very near
that of the radio source IVS 1746+340 (cf. Beasley et al. 2002,
Ap.J. Suppl. 141, 31).

                      (C) Copyright 2005 CBAT
2005 September 16              (8601)            Daniel W. E. Green

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