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IAUC 8532: C/2005 K1; 9P

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IAUC number

                                                  Circular No. 8532
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)

     B. A. Skiff, Lowell Observatory, reports his discovery of a
comet on images taken by himself with the 0.59-m LONEOS Schmidt
telescope (discovery observation below).  The object has a 16"
moderately condensed coma, and a narrow fan-shaped tail extends
about 90" in p.a. 325 deg.  Following posting on the 'NEO
Confirmation Page', R. Trentman (Louisburg, KS, 0.75-m reflector)
writes that his CCD images from May 17.3 show a coma extended 1'.3
in p.a. 305 deg.  Also, P. Birtwhistle (Great Shefford, Berkshire,
U.K., 0.30-m f/6.3 Schmidt-Cassegrain reflector) writes that his
CCD images taken on May 17.91 UT show a moderately condensed 12"
coma and a broad, 20"-long tail in p.a. 320 deg (possibly
extending to 50").

     2005 UT             R.A. (2000) Decl.       Mag.
     May  16.33803   17 54 16.68   +65 15 46.2   16.9

The available astrometry, very uncertain parabolic orbital elements
(T = 2005 Nov. 15.68 TT; Peri. = 128.25 deg, Node = 102.11 deg, i =
79.58 deg, equinox 2000.0; q = 4.2242 AU), and an ephemeris appear
on MPEC 2005-K15.

     L.-M. Lara, Instituto de Astrofisica de Andalucia (IAA); H.
Boehnhardt, Max-Planck Institut fuer Sonnensystem Forschung; R.
Gredel, Calar Alto Observatory; and P. J. Gutierrez, J.-L. Ortiz,
R. Rodrigo, and M. Jesus Vidal-Nunez, IAA, report that their
monitoring observations of comet 9P (in support of the Deep Impact
mission) at the Calar Alto and Sierra Nevada Observatories since
January show increasing dust production and coma evolution.  The
Af(rho) value (cf. IAUC 7342) varies with heliocentric distance as
r**-6.71; slightly enhanced Af(rho) (above the r**-6.71 curve) was
observed from mid-February until the end of March, when fan-shaped
structures appeared in the coma for the first time.  Since April,
four straight jet features have been observed in the coma's
southern hemisphere at approximately constant position angles,
suggesting the presence of at least two active regions on the
nucleus.  On Apr. 14, Af(rho) = 287 cm within an aperture
representing 5000 km at the comet.  Clear CN and C_3 emissions are
detected on the same date, the production rates being 2.26 x 10**25
and 1.32 x 10**24 s**-1, respectively.  Radial-brightness profiles
follow log B about log (rho)**-m, with 1.30 </= m </= 1.47 in the
north-south direction.  The reflectivity slope of the dust coma is
about 30 percent over 100 nm.

                      (C) Copyright 2005 CBAT
2005 May 20                    (8532)            Daniel W. E. Green

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