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IAUC 9139: C/2010 H4; P/2010 H2; (20461)

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IAUC number 

                                                  Circular No. 9139
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 H4 (SCOTTI)
     J. V. Scotti, Lunar and Planetary Laboratory, reports his
discovery of a comet (discovery position tabulated below), slightly
diffuse and showing a tail to the west-northwest, with the 0.9-m
f/3 Spacewatch reflector (+ CCD mosaic) at Kitt Peak.  His follow-
up observations with the 1.8-m f/2.7 reflector on Apr. 20.35 UT
showed a coma of diameter 4" and a tail extending 0'.75 in p.a. 288
deg.  After announcement on the Minor Planet Center's 'NEOCP'
webpage, further follow-up observations by W. H. Ryan at Magdalena
Ridge (2.4-m reflector) on Apr. 21.4 showed a faint tail in p.a.
290 deg.  S. Foglia, P. Miller, and J. Wood report that images
taken on Apr. 21.6 with the 2.0-m f/10 'Faulkes Telescope South' at
Siding Spring show a 15" tail in p.a. 295 deg.

     2010 UT             R.A. (2000) Decl.       Mag.   Observer
     Apr. 20.26786   14 32 29.42   -14 37 58.2   21.0   Scotti

     The available astrometry are published on MPECs 2010-H41 and
2010-H61; the following parabolic orbital elements and an ephemeris
appear on MPEC 2010-H61.

     T = 2012 Jan. 17.086 TT          Peri. = 304.274
                                      Node  =  41.064   2000.0
     q = 1.42143 AU                   Incl. =   7.665


COMET P/2010 H2 (VALES)
     B. Yang and G. Sarid, University of Hawaii, report that near-
infrared (0.8- to 2.5-micron) spectra of comet P/2010 H2 were taken
with the 3.0-m NASA Infrared Telescope Facility atop Mauna Kea on
Apr. 20 and 22 UT.  Two broad absorption bands were detected,
centered at 1.5 microns (the depth being 4 percent of the continuum)
and 2.0 microns (8 percent deep), in the reflectance spectra.
These features, which appeared on both nights, are consistent with
abundant water-ice grains in the central coma.  In addition, a
narrow absorption band was found at 1.65 microns, which strongly
indicates the presence of crystalline ice.  These preliminary
results show that the temperature of the observed ice particles is
about 100 +/- 20 K.


(20461) DIORETSA
     On IAUC 9123, '2009 QY_6 AND 2010 CG_55', last line, (20461)
1999 LD_31 is named Dioretsa.

                      (C) Copyright 2010 CBAT
2010 April 25                  (9139)            Daniel W. E. Green

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