[IAUC] IAUC 8870: P/2007 R4; Var STAR IN Per [25139-2008/05-R1]

Lun Sep 17 14:39:42 ART 2007

                                                  Circular No. 8870
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS en CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT en CFA.HARVARD.EDU (science)
URL http://www.cfa.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)

COMET P/2007 R4 (GARRADD)
     G. J. Garradd reports his discovery of a comet on CCD images
taken with the 0.5-m Uppsala Schmidt telescope in the course of the
Siding Spring Survey (discovery observation tabulated below), the
object indicated as having a faint 20" tail to the west on 30-s
exposures.  Following posting on the Minor Planet Center's 'NEOCP'
webpage, A. C. Gilmore and P. M. Kilmartin (Mt. John 1.0-m f/7.7
reflector) write that their images from Sept. 16.50-16.56 UT show a
coma of diameter about 5" and a 'wedge'-shaped tail 25" long in p.a.
270 deg; Gilmore's images taken on Sept. 17.5 show a coma diameter
of about 9" with central condensation (FWHM 4") and a tail 20" long
in p.a. 260 deg.

     2007 UT             R.A. (2000) Decl.       Mag.
     Sept.14.60795    2 15 02.73   -26 34 54.8   18.4

The available astrometry (including prediscovery Siding Spring
images from Aug. 12), together with the following preliminary
elliptical orbital elements and an ephemeris, appear on MPEC
2007-S04.

     T = 2007 Sept.26.904 TT          Peri. = 282.601
     e = 0.67380                      Node  =  87.603   2000.0
     q = 1.92336 AU                   Incl. =  20.240
       a =  5.89621 AU     n = 0.068841     P =  14.32 years

VARIABLE STAR IN PERSEUS
     H. Mikuz, Crni Vrh Observatory, reports that a new starlike
variable (mag 17.9, roughly equivalent to the R band) was detected
on four unfiltered CCD images (limiting mag 19.0) taken around
Sept. 16.078 UT in the course of the PIKA project at the Crni Vrh
Observatory using the 0.60-m f/3.3 Cichocki telescope.  The
variable object is located at R.A. = 3h57m28s.01, Decl. =
+35o37'16".3 (equinox 2000.0).  This position is consistent with
USNO-B1-catalogue star 1256-0061977 with B magnitude 21.5.
Additional PIKA magnitudes for the new object show that it is
brightening:  2003 Sept. 26, [19.0; 2004 Feb. 9, [19.0; 2005 Jan.
11, [19.0; 2007 Sept. 16.955, B = 17.90 +/- 0.10, R = 17.65 +/-
0.05; Sept. 17.037, B = 17.60 +/- 0.09, R = 17.39 +/- 0.04.
Nothing is visible at this location on several Palomar Sky Survey
and 2MASS images from the Aladin database.

                      (C) Copyright 2007 CBAT
2007 September 17              (8870)            Daniel W. E. Green