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IAUC 7873: XTE J1908+094; 2002cd; C/2002 G1, C/2002 G2

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IAUC number

                                                  Circular No. 7873
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)

XTE J1908+094
     J. J. M. in 't Zand, Astronomical Institute, Utrecht University,
and Space Research Organization Netherlands; and M. Capalbi and M. Perri,
ASI Science Data Center, Frascati, report on behalf of a larger team
that two target-of-opportunity observations were carried out with
BeppoSAX on the proposed black-hole x-ray transient XTE J1908+094
(Woods et al., IAUC 7856; Feroci et al., IAUC 7861): "The second
observation was with the Medium-Energy Concentrator Spectrometer on
Apr. 2.4-3.8 UT and resulted in an order-of-magnitude improvement of the
positional accuracy.  We localize the source at
R.A. = 19h08m52s.6, Decl. = +9d23'07" (equinox 2000.0; uncertainty
17", 90-percent confidence).  This is 0'.9 from the position determined
by Woods et al. but consistent within its 2' accuracy."

SUPERNOVA 2002cd IN NGC 6916
     T. Matheson, S. Jha, P. Challis and R. Kirshner, Harvard-Smithsonian
Center for Astrophysics, report that a spectrum (range 370-750 nm) of
SN 2002cd (cf. IAUC 7871), obtained by M. Calkins on Apr. 10.49 UT with
the F. L. Whipple Observatory 1.5-m telescope (+ FAST spectrograph), shows it
to be a type Ia supernova before maximum.  Adopting the NASA/IPAC
Extragalactic Database recession velocity of 3101 km/s for the host
galaxy, the supernova expansion velocity is about 16 800 km/s for Si II
(rest 635.5 nm).  The spectrum shows strong, narrow Na I D absorptions
at zero velocity (0.12-nm equivalent width) and at the velocity of the
host galaxy (0.21-nm EW).  The dust maps by Schlegel et al. (1998,
Ap.J. 500, 525) indicate a Galactic reddening of E(B-V) = 0.41.  In
addition, the overall shape of the spectrum declines toward the blue,
implying that the supernova is heavily extinguished by dust.  Aside
from the reddening, the spectrum is consistent with a normal Ia about
ten days before maximum.

COMETS C/2002 G1 AND C/2002 G2 (SOHO)
     Further to IAUC 7863, D. Hammer reports his measurements of a non-Kreutz
comet and a Kreutz comet found by R. Kracht on SOHO website C2 coronagraph
images.  Reduced astrometry and orbital elements by the undersigned appear on
the cited MPECs.

  Comet         2002 UT          R.A. (2000) Decl.       MPEC
  C/2002 G1     Apr.  2.653       0 41.9   + 3 20       2002-G13
  C/2002 G2           4.579       1 01.4   + 5 08       2002-G28

                      (C) Copyright 2002 CBAT
2002 April 10                  (7873)              Brian G. Marsden

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