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IAUC 8439: P/2004 TU_12; 2004ga, 2004gb; 2004fv

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IAUC number

                                                  Circular No. 8439
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)

     G. Masi, Ceccano, Italy, reports further on their CCD images
of this comet (cf. IAUC 8436), noting that the tail was brighter
close to the comet's head on Nov. 12.0 UT; on Nov. 14.2 and 15.1
the tail was faint (barely visible) close to the nuclear
condensation while peaking in intensity about 100" and about 130",
respectively, from the comet's head.  On Nov. 14.2 and 15.1, the
total tail length was > 5'.8 and > 10', respectively, always
pointing toward p.a. 70 deg.  Images taken on Nov. 17.04-17.07 show
the tail to be definitely fainter than on the previous night, being
barely visible for the first 1' from the comet's head but clearly
brighter beyond that point (visible to > 6', beyond the edge of the
frames); the first 3'.3 of the tail was in p.a. 72 deg, with a
sudden change at that point to p.a. 73 deg.

SUPERNOVAE 2004ga AND 2004gb
     A. Garg, Department of Physics, Harvard University; with S.
Blondin, P. Challis, C. Stubbs, and the SuperMACHO collaboration
(cf. IAUC 7791; plus C. Aguilera, J. L. Prieto, D. Bramich, M.
Huber, and D. Minniti, minus Hiriart, Lepischak, and Schmidt),
announce the detection with the Cerro Tololo 4-m telescope (+
MOSAIC imager) of two supernovae located behind the Large
Magellanic Cloud (the 'VR' magnitudes given below being their peak
brightnesses); 4-m-telescope data of SN 2004ga were also obtained
on Sept. 18, Oct. 6, 9, 11, 17, and 21, and of SN 2004gb also on
Oct. 5, 9, 11, 13, 19, 21, and Nov. 6.  Spectroscopy obtained at
the Magellan Clay telescope (+ LDSS-2 spectrograph) on Nov. 3 and 5
indicates that SN 2004gb is of type Ia, approximately 10 days after
maximum, while SN 2004ga in a face-on galaxy is of type II;
Magellan 'MagIC' observations of SN 2004gb were also obtained on
Nov. 3, 5, and 6.

SN      2004 UT     R.A. (2000.0) Decl.   Mag.   z    Offset
2004ga  Sept.11   5 58 11.5  -71 37 00.3  19.7  0.11  238" W, 3" N
2004gb  Oct. 15   4 55 22.3  -67 30 44.3  20.5  0.22      --

SUPERNOVA 2004fv IN NGC 6492
     K. Krisciunas, University of Notre Dame, reports that spectra
of SN 2004fv (IAUC 8430), taken by A. Pasten with the Cerro Tololo
1.5-m telescope on Nov. 16.0 UT and reduced by M. Salvo, show it to
be a normal type-Ia supernova, about 2 weeks after maximum light.

                      (C) Copyright 2004 CBAT
2004 November 17               (8439)            Daniel W. E. Green

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