Central Bureau for Astronomical Telegrams

IAUC 9125: COMET C/2010 D4 (WISE); COMET P/2010 E2 (JARNAC)

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IAUC number

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                                                  Circular No. 9125
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
CBAT Director:  D. W. E. Green, Room 209; Department of
 Earth and Planetary Sciences; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
CBAT@IAU.ORG; CBATIAU@EPS.HARVARD.EDU
URL http://www.cfa.harvard.edu/iau/cbat.html  ISSN 0081-0304


COMET C/2010 D4 (WISE)
     A. Mainzer, Jet Propulsion Laboratory, notes that an object
found on WISE satellite images (discovery observation tabulated
below) appears "soft" in 12-micron images with a 'blurry' central
condensation of size about 14"; 22-micron images show it to be
brighter, with diameter about 17".  Numerous ground-based observers
have been unable to detect cometary activity.

     2010 UT             R.A. (2000) Decl.       Observer
     Feb. 28.01782   17 15 03.30   +41 02 22.1   WISE

The available astrometry, parabolic orbital elements (T = 2009 Mar.
30.939 TT, q = 7.17413 AU, Peri. = 43.916 deg, Node = 266.488 deg,
i = 105.482 deg, equinox 2000.0), and an ephemeris appear on MPEC
2010-E63.


COMET P/2010 E2 (JARNAC)
     An apparently asteroidal object reported by T. Glinos on CCD
images taken with a 0.64-m f/7.2 Ritchey-Chretien telescope at the
Jarnac Observatory in Vail, AZ, U.S.A., on Mar. 9, 10, and 12
(discovery observation tabulated below; observers listed as D. Levy,
W. Levy, and T. Glinos), and linked together by the Minor Planet
Center staff and also with observations from the Mount Lemmon
survey taken on Feb. 17 before being posted on the MPC's 'NEOCP'
webpage, has been found to show cometary appearance by other CCD
astrometrists.  D. Chestnov and A. Novichonok write that three co-
added 300-s unfiltered CCD images taken remotely with a 0.36-m
f/3.8 reflector at the Tzec Maun Observatory near Mayhill, NM,
U.S.A. on Mar. 13.23 UT show a faint 0'.3 coma of mag 19 with a
strong nuclear condensation and no tail.  CCD images taken by W. H.
Ryan and E. V. Ryan with the Magdalena Ridge Observatory (not
McDonald Observatory, as erroneously written on IAUC 9117) 2.4-m
f/8.9 reflector on Mar. 13.4 show a coma extending toward p.a.
about 280 deg.

     2010 UT             R.A. (2000) Decl.       Mag.
     Mar.  9.30939   12 02 57.94   - 1 17 03.0   18.7

The available astrometry, the following elliptical orbital elements,
and an ephemeris appear on MPEC 2010-E64.

     T = 2010 Apr.  7.8086 TT         Peri. =   8.2567
     e = 0.721879                     Node  = 177.8984  2000.0
     q = 2.397960 AU                  Incl. =  15.4256
       a =  8.621986 AU    n = 0.0389308    P =  25.3 years

                      (C) Copyright 2010 CBAT
2010 March 13                  (9125)            Daniel W. E. Green

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