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IAUC 9154: C/2010 L4; C/1998 D1, C/1999 R5, C/1999 S8

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IAUC number 

                                                  Circular No. 9154
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 L4 (WISE)
     A. Mainzer, Jet Propulsion Laboratory, reports the discovery
of a comet on 12- and 22-micron images taken by the WISE spacecraft
(discovery observation tabulated below), noting the object to have
a "hazy" coma of diameter about 15", with a fan-shaped tail
extending about 30" toward the west; she adds that this comet is
approximately as bright as comet P/2010 D1 was when WISE first
observed that object (cf. IAUC 9118), which was around mag 21
optically.  After posting on the 'NEOCP' webpage, ground-based CCD
astrometrists have also noted the object's cometary appearance.
W. H. Ryan (Magdalena Ridge Observatory, 2.4-m reflector) reports
that R-band images taken on June 18.25-18.30 UT show a distinct
coma of mag 18.9-19.5.  S. Foglia reports that exposures taken by
R. Holmes (Ashmore, IL, U.S.A., 0.81-m telescope, June 18.4) show a
coma diameter of 5" with magnitude 19.5-20.0.  R. Miles writes that
an exposure taken on June 18.44 with the 2.0-m f/10 "Faulkes
Telescope North" at Haleakala in 1".3 seeing shows the object in a
crowded star field to be diffuse and about 2".5 across with a very
faint tail about 6" long in p.a. 250 deg.

     2010 UT             R.A. (2000) Decl.       Observer
     June 15.45621   21 43 21.53   +47 35 45.7   WISE

The available astrometry, the following preliminary parabolic
orbital elements, and an ephemeris appear on MPEC 2010-M20.

     T = 2010 Jan. 24.066 TT          Peri. =  85.253
                                      Node  = 126.567   2000.0
     q = 2.66207 AU                   Incl. = 102.120


COMET C/1998 D1, C/1999 R5, C/1999 S8 (SOHO)
     Further to IAUC 9153, additional Kreutz sungrazers have been
found on SOHO website images, all stellar in appearance; peak
magnitudes were about 7-7.5 for C/1998 D1 and about 7.5 for the
others.

 Comet       1998 UT        R.A.(2000)Decl.   Inst.  F    MPEC
 C/1998 D1   Feb. 26.985    22 58.7  - 9 14    C3    MK   2010-L60

 Comet       1999 UT        R.A.(2000)Decl.   Inst.  F    MPEC
 C/1999 R5   Sept.  9.321   10 52.3  + 4 45    C3    JR   2010-L60
 C/1999 S8         20.071   11 33.2  + 0 37    C3    JR   2010-L60

                      (C) Copyright 2010 CBAT
2010 June 18                   (9154)            Daniel W. E. Green

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