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IAUC 8083: 2002kl; 2003V, 2003ah, 2003av, 2003ax, 2003bf; C/2002 Y1; YY Her

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                                                  Circular No. 8083
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)


SUPERNOVA 2002kl
     Further to IAUC 8081, T. Dahlen reports the discovery of
another apparent supernova on ACS images of the Hubble Deep Field
North, located at R.A. = 12h37m49s.30, Decl. = +62o14'06".1, which
is 0".15 east and 0".45 south of the center of the nearest visible
galaxy.  Available z-band magnitudes for SN 2002kl:  2002 Nov.
21.76, 24.8; 2003 Jan. 2.91 UT, 25.0; Feb. 21.95, [28.


SUPERNOVAE 2003V, 2003ah, 2003av, 2003ax, 2003bf
     A. V. Filippenko and R. Chornock, University of California,
Berkeley, report that inspection of CCD spectra (range 310-1000 nm)
obtained on Feb. 27 UT with the Keck I 10-m telescope (+ LRIS)
shows that SN 2003V (IAUC 8060) is of type Ia, about 2 months past
maximum brightness. SN 2003av (IAUC 8077) and SN 2003ax (IAUC 8079)
are also of type Ia, about 2 weeks past maximum.  Yet another
type-Ia supernova is SN 2003ah (IAUC 8068), about 12 days past
maximum.  SN 2003bf (cf. IAUC 8082) is of type Ia, very close to
maximum brightness.


COMET C/2002 Y1 (JUELS-HOLVORCEM)
     D. K. Lynch, R. W. Russell, and D. L. Kim, The Aerospace
Corporation; M. L. Sitko, University of Cincinnati; and R. B. Perry,
Langley Research Center, NASA, report that 3-14-micron spectroscopy
of comet C/2002 Y1, obtained on Feb. 20.6 UT with the NASA Infrared
Telescope Facility 3-m telescope (+ Aerospace Broadband Array
Spectrograph System), yielded a narrowband magnitude of N [10.2
microns] = 3.5 +/- 0.1.  The spectrum shows a smooth featureless
continuum with an 8-13-micron color temperature of about 280 +/- 20
K, roughly 12 times higher than the radiative equilibrium blackbody
temperature.  The comet was not detected between 3 and 8 microns,
and an upper limit to the silicate emission feature was
approximately 10 percent of the 8-13-micron continuum.


YY HERCULIS
     E. O. Waagen, AAVSO, reports that this variable is in outburst
for the first time since May 1993 (cf. IAUC 5805; it peaked at m_v
= 11.3 in July 1993, slowly faded over a year to m_v = 13.6,
rebrightened to m_v = 12.3 in early 1995, and then declined to its
normal minimum near mag 13 by Sept. 1995).  Recent CCD V magnitudes
from R. James, Las Cruces, NM:  Feb. 2.518 UT, 12.9; 9.513, 12.8;
17.496, 12.1; 23.503, 11.9; 27.472, 11.9.

                      (C) Copyright 2003 CBAT
2003 February 27               (8083)            Daniel W. E. Green

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