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IAUC 7950: 2002 P1; V4334 Sgr; C/2002 O4

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IAUC number 

                                                  Circular No. 7950
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 2002 P1
     S. Pravdo, K. Lawrence and E. Helin, Jet Propulsion Laboratory, report the
NEAT team's discovery with the 1.2-m Schmidt telescope at Palomar of a
comet with a 7" tail in p.a. 235 deg.  Confirmation of the object's
diffuse appearance has been provided by G. Hug, Farpoint Observatory:

     2002 UT             R.A. (2000) Decl.        m1    Observer
     Aug.  7.38888   21 16 06.93   - 9 47 55.3   19.6   NEAT
           7.40417   21 16 06.50   - 9 47 54.2   19.2     "
           7.41704   21 16 06.16   - 9 47 52.8   19.9     "
           8.25898   21 15 44.62   - 9 46 50.0   18.3   Hug
           8.27350   21 15 44.37   - 9 46 47.7   18.4     "


V4334 SAGITTARII
     R. W. Russell, D. K. Lynch and D. L. Kim, The Aerospace Corporation; M. L.
Sitko, University of Cincinnati; E. Polomski, University of Minnesota; and
H. B. Hammel, Space Science Institute, report 3-14-micron spectroscopy of
V4334 Sgr (Sakurai's object) using BASS on the NASA IRTF on July 31.38 UT:
"The spectrum is well fitted by a 430 (+/- 10)-K blackbody.  The data appear
consistent with a very weak (possibly silicate) absorption feature near
10-11 microns.  Monochromatic magnitudes [3.5 um], [4.8 um] and [10.2 um] were
5.09, 2.64 and 0.45, respectively, all +/- 0.05 or less.  Observations taken
with The Aerospace Corporation's near-infrared (0.8-2.5 micron) imaging
spectrograph at the Lick Observatory on July 18.3 by R. J. Rudy, D. K. Lynch,
S. M. Mazuk and C. C. Venturini, R. C. Puetter and R. B. Perry reveal a
featureless continuum rising rapidly at longer wavelengths and joining
smoothly with the BASS/IRTF spectrum.  H and K short magnitudes were 15.8 and
11.2, respectively, both +/- 0.2.  Compared to the 1998 observations (Lynch
et al. 2002, Astrophys. Space Sci. 279, 57), the object's near-infrared flux
has dropped dramatically, but the infrared luminosity has increased by about
40 percent."


COMET C/2002 O4 (HOENIG)
     Sitko, Lynch, Russell, Hammel and Polomski report similar spectroscopy
of comet C/2002 O4 on Aug. 1.54 UT: "The infrared flux peaked near
10 microns, suggesting a temperature of around 280 +/- 20 K (equilibrium
blackbody temperature = 243 K).  There was a silicate-emission feature between
about 8.5 and 11.5 microns extending about 20 percent above the continuum.
Narrow-band [M] and [N] magnitudes were 9.7 and 4.4, respectively, both
+/- 0.1."

                      (C) Copyright 2002 CBAT
2002 August 8                  (7950)              Brian G. Marsden

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