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IAUC 8540: Poss. N IN Aql; 2005ch; Var STAR IN Nor; C/2005 K2

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IAUC number

                                                  Circular No. 8540
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)

     G. Pojmanski reports the ASAS detection (cf. IAUC 8495, 8539)
of a variable star located at R.A. = 19h05m12s, Decl. = +5o14'.2
(equinox 2000.0), providing the following V magnitudes:  June 3.318
UT, [14; 9.240, 11.05; 10.226, 10.5:; 10.234, 10.8: (the June 10
frames taken through heavy cloud cover).  A. Oksanen, Jyvaeskylae,
Finland, reports the variable star at V = 10.84 (noting the object
as being very red on images taken in various passbands) on June
10.36 from a remote observation with the 0.30-m Mewlon telescope in
New Mexico, providing the following position end figures:  12s.50,
12".0.  Oksanen adds that a USNO-B1.0 star (red mag 18.1) has the
following position end figures:  12s.186, 12".25.

     Further to IAUC 8539, E. J. Christensen reports that SN 2005ch
appeared at V = 17.3-17.4 on prediscovery images obtained on May
31.27-31.29 UT in the course of the Catalina Sky Survey.  Nothing
is visible at the location of the new object on Catalina Sky Survey
images obtained on May 19.14 (limiting mag V approximately 19.5).
R. A. Tucker, Tucson, AZ, reports the following unfiltered CCD
magnitudes obtained with the 0.35-m MOTESS telescopes:  May 30.176,
17.5; June 1.170, 17.1; 3.192, 16.5; 4.189, 16.4; 5.186, 16.2;
6.183, 16.1; 7.167, 16.1; 8.165, 16.0; 9.162, 15.9.

     Further to IAUC 8539, L. A. G. Monard, Pretoria, S. Africa,
reports the following precise position from a frame taken by
himself on June 9.87 UT (when the star was at R_c = 12.55 and V =
12.75):  R.A. = 16h00m47s.43, Decl. = -48o46'07".6 (equinox 2000.0;
uncertainty +/- 0".25).  He adds that this lies close to a
USNO-A2.0 star with position end figures 47s.475, 05".43 (blue mag
17.9, red mag 15.7).  Six hours of time-series unfiltered
photometry showed an initial large hump in the light curve, which
gradually was replaced by smaller humps and a general fading trend.

     This comet appears to have had an outburst; total visual
magnitude estimates:  June 6.48 UT, 11.7 (S. Yoshida, Gunma, Japan,
0.40-m reflector); 7.97, 10.3 (N. Biver, Ablis, France, 0.41-m
refl.); 9.08, 9.8 (J. J. Gonzalez, Leon, Spain, 25x100 binoculars);
9.95, 8.9 (Gonzalez, 11x80 binoculars).

                      (C) Copyright 2005 CBAT
2005 June 10                   (8540)            Daniel W. E. Green

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