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IAUC 8557: C/2005 N1; 2005cp, 2005ct

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IAUC number 

                                                  Circular No. 8557
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 N1 (JUELS-HOLVORCEM)
     C. W. Juels, Fountain Hills, AZ; and P. R. Holvorcem, Campinas,
Brazil, report their discovery of a diffuse comet on CCD images
taken with a 0.07-m f/2.8 refractor at Fountain Hills (discovery
observation given below).  Following posting on the 'NEO
Confirmation Page', other CCD observers have remarked on the
object's cometary nature.  J. E. McGaha (Tucson, AZ, 0.36-m f/10
Schmidt-Cassegrain reflector) notes that ten stacked 60-s exposures
taken on July 3.4 UT show a bright inner coma of diameter 30" and a
faint outer coma extending out to a diameter of 70", with a 20"-
wide tail that is 120" long in p.a. 255 deg.  C. W. Hergenrother,
Lunar and Planetary Laboratory, writes that a 300-s R-band exposure
with the University of Arizona 1.54-m reflector shows a circular
coma 27" in diameter, but with no hint of a tail.  Images taken by
L. Buzzi and F. Luppi (Varese, Italy, 0.60-m f/4.6 reflector) on
July 3.1 show a diffuse, round coma of diameter about 20".  The
available astrometry (with prediscovery observations by Juels and
Holvorcem on June 30 and July 1), preliminary parabolic orbital
elements [T = 2005 Aug. 21.24 TT, Peri. = 78.94 deg, Node = 3.04
deg, i = 50.85 deg (equinox 2000.0), q = 1.1380 AU], and an
ephemeris appear on MPEC 2005-N10.

     2005 UT             R.A. (2000) Decl.       Mag.
     July  2.44762    3 16 42.45   +34 57 46.1   14.6


SUPERNOVAE 2005cp AND 2005ct
     Further to IAUC 8550, J. Graham and W. Li report the LOSS
discovery of an apparent supernova (mag 17.3) on unfiltered KAIT
images taken on July 1.49 and 2.47 UT.  SN 2005ct is located at
R.A. = 0h39m40s.50, Decl. = -14o14'16".6 (equinox 2000.0), which is
3".0 west and 2".3 south of the center of NGC 207.  A KAIT image
taken on Jan. 20.19 showed nothing at this position (limiting mag
about 19.5).
     M. Modjaz, R. Kirshner, and P. Challis, Harvard-Smithsonian
Center for Astrophysics, report that a spectrogram (range 340-740
nm) of SN 2005cp (cf. IAUC 8550), obtained by R. Hutchins on June
30.43 UT with the F. L. Whipple Observatory 1.5-m telescope (+
FAST), shows it to be a type-IIn supernova.  The spectrum consists
of a blue continuum, indicating young age, and Balmer emission
lines with a narrow component of about 400 km/s (FWHM) superposed
on a weaker and broader component of about 4000 km/s (FWHM), after
removing the NED recession velocity of 6616 km/s for the host
galaxy (from Falco et al. 1999, PASP 111, 438).

                      (C) Copyright 2005 CBAT
2005 July 3                    (8557)            Daniel W. E. Green

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