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IAUC 8273: 2004K; 2004G; 2004H; C/2001 Q4

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IAUC number

                                                  Circular No. 8273
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)

     Further to IAUC 8272, J. Graham and W. Li report the LOSS
discovery, on KAIT images taken on Jan. 19.6 (mag about 17.2) and
21.5 UT (mag about 17.1), of an apparent supernova located at R.A.
= 14h23m39s.85, Decl. = -19o26'50".0 (equinox 2000.0), which is
15".5 west and 11".8 south of the nucleus of ESO 579-G22.  A KAIT
image taken on 2003 July 1.2 showed nothing at this position
(limiting mag about 19.0).

     N. Elias-Rosa, Osservatorio Astronomico di Padova (OAP); G.
Pignata, European Southern Observatory (ESO); S. Benetti, G. Blanc,
A. Della Valle, A. Pastorello, G. Altavilla, H. Navasardyan, M.
Turatto, and L. Zampieri, OAP; E. Cappellaro, Osservatorio
Astronomico di Capodimonte; and F. Patat, ESO, on behalf of the
ERTN (IAUC 7987), report, from inspection of spectra obtained on
Jan. 21.15 UT with the Calar Alto 2.2-m reflector (+ CAFOS; range
380-880 nm; resolution 1.1 nm), and Jan. 21.18 with the Asiago
1.8-m telescope (+ AFOSC; range = 355-780 nm, resolution 2.4 nm),
that SN 2004G (IAUC 8272) is a type-II supernova, about 5 months
after explosion.  The expansion velocities deduced from the H_alpha
and H_beta absorptions are about 6600 and 4300 km/s, respectively.

     C. L. Gerardy and G. H. Marion, University of Texas at Austin,
report that a low-resolution optical spectrogram (resolution 600;
range 430-700 nm) of SN 2004H (cf. IAUC 8272), obtained on Jan.
22.35 UT with the 2.7-m Harlan J. Smith Telescope (+ LCS
spectrograph) at McDonald Observatory, shows it to be a type-Ia
supernova near maximum light; adopting the 9497 km/s redshift of IC
708 from the NASA/IPAC Extragalactic Database, the expansion
velocity of the Si II feature (rest wavelength 635.5 nm) is 10600
km/s.  The 580-nm Si II absorption feature appears unusually strong
relative to the 615-nm feature, indicating that SN 2004H is likely
a subluminous type-Ia object.

COMET C/2001 Q4 (NEAT)
     Total visual magnitude estimates:  2003 Dec. 22.09 UT, 9.8 (A.
Amorim, Florianopolis, Brazil, 0.14-m refl.); 2004 Jan. 10.46, 9.0
(D. A. J. Seargent, The Entrance, N.S.W., 10x50 binoculars); 14.02,
9.0 (Amorim).

                      (C) Copyright 2004 CBAT
2004 January 22                (8273)            Daniel W. E. Green

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