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IAUC 8062: 2003X, 2003Y,, 2003Z; C/2002 X5

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                                                  Circular No. 8062
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)

SUPERNOVAE 2003X, 2003Y, AND 2003Z
     Three apparent new supernovae have been discovered on
unfiltered CCD images, as tabulated below.  SN 2003X was reported
by T. Boles (cf. IAUC 8059); SN 2003Y was found via LOTOSS/KAIT
(reported by B. Beutler and W. Li; cf. IAUC 8061); and SN 2003Z was
found by Y. L. Qiu and J. Y. Hu, Beijing Astronomical Observatory
(BAO), with the BAO 0.6-m telescope (forwarded by W. Li).

SN      2003 UT       R.A.  (2000.0)  Decl.   Mag.      Offset
2003X   Jan. 28.25  18 12 05.67  +29 09 17.3  17.0   1".3 E, 4".2 S
2003Y   Jan. 29.3    8 54 34.60  +57 10 19.8  17.4   3".7 W, 18".9 N
2003Z   Jan. 29.7    9 07 32.46  +60 29 17.5  16.7   8".4 W, 31".0 N

Additional approximate magnitude estimates:  SN 2003X in UGC 11151,
2002 Oct. 18 UT, [19.0 (Boles); 2003 Jan. 30.166, 17.0 (Boles);
30.529, 16.7 (Boles, from image by M. Schwartz, Cottage Grove, OR).
SN 2003Y in IC 522, 2002 Dec. 25.3, [19.0 (KAIT); 2003 Jan. 30.3,
17.2 (KAIT).  SN 2003Z in NGC 2742, Jan. 20.7, [18.1 (BAO); 30.4,
16.5 (KAIT).

     R. W. Russell, D. K. Lynch, and D. L. Kim, The Aerospace
Corporation; M. L. Sitko, University of Cincinnati; and W. Golisch,
NASA Infrared Telescope Facility (IRTF), report that spectroscopy
of comet C/2002 X5 was obtained on Jan. 9.1 and 10.05-10.14 UT at
1.5-3.4 airmasses with the Aerospace Broadband Array Spectrograph
System at the IRTF 3-m telescope.  They observed a relatively
smooth thermal-emission spectrum, over most of the spectral range
covered (3-14 microns), whose shape resembled a blackbody near or
slightly above the blackbody radiative equilibrium temperature of
340 K.  A silicate emission feature, if present, would be no more
than about 15 percent of the continuum.  A 3.4-micron C-H feature
may be present in emission.  Narrowband magnitudes (each +/- 0.05)
on Jan. 9.1 in a 3".5-diameter aperture were L [3.5 microns] = 8.3,
M [4.5 microns] = 5.8, and N [10.2 microns] = 1.7.  The emission at
10.2 microns was extended at least 18" east-west and 10" north-
south, using a 29" north-south chop.  The beam only needed to be
moved about 3" east-west to get to the half-power location,
suggesting that the infrared emission was concentrated on the peak
with an extended coma component.  On Jan. 10, the spectrum was
essentially unchanged, though perhaps 5 percent brighter.

                      (C) Copyright 2003 CBAT
2003 January 30                (8062)            Daniel W. E. Green

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