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IAUC 8329: 2004bj, 2004bk; C/2002 T7; 1999 DJ_4; C/2004 F4

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IAUC number

                                                  Circular No. 8329
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 2004bj AND 2004bk
     Further to IAUC 8321, H. Pugh and W. Li report the LOSS
discovery of two apparent supernovae on unfiltered KAIT images:

SN       2004 UT        R.A.  (2000.0)  Decl.   Mag.     Offset
2004bj   Apr. 22.36   13 16 18.03  + 7 02 52.7  18.3   15".0 E, 6".3 N
2004bk   Apr. 22.36   13 37 28.72  + 4 06 11.3  16.0   9".9 W, 4".8 S

Additional KAIT magnitudes:  SN 2004bj in MCG +01-34-13, Mar. 21.35
UT, [19.0; Apr. 2.38, [18.0; 23.35, 18.3.  SN 2004bk in NGC 5246,
Apr. 2.38, [19.0; 23.35, 15.9.

     E. S. Howell, Arecibo Observatory, reports that observations
of the 18-cm OH lines in this comet, made with A. J. Lovell and F.
P. Schloerb at Arecibo Observatory, result in the following
production rates:  Apr. 10.63 UT, log Q(OH) = 29.4; 15.60, 29.3;
16.59, 29.4; 17.59, 29.5 (uncertainties of order 10**28 mol/s).
Line shapes are consistent with parent outflow velocities ranging
from 1.7 to 2.0 km/s.  Spectra obtained on Apr. 14-15 reveal an
excess of 10-20 percent around cometocentric velocities of +3 km/s.

1999 DJ_4
     L. A. M. Benner, Jet Propulsion Laboratory; M. C. Nolan,
National Astronomy and Ionospheric Center, and Arecibo Observatory;
S. J. Ostro and J. D. Giorgini, Jet Propulsion Laboratory; J. L.
Margot, University of California, Los Angeles; and C. Magri,
University of Maine at Farmington, report:  "Arecibo delay-Doppler
images (2380 MHz, 12.6 cm), obtained on Apr. 14-16, confirm that
1999 DJ_4 is a binary system (cf. IAUC 8316).  Preliminary
estimates of average diameters, based on range extents at 15-m
resolution, are 420 and 200 m.  The maximum range separation
observed is more than 700 m."

     Visual total-magnitude estimates in bright twilight:  Apr.
22.48 UT, 4.5 (A. Hale, Cloudcroft, NM, 0.2-m reflector); 23.21,
3.9 (J. J. Gonzalez, Leon, Spain, 0.20-m reflector; 0.1-deg tail in
p.a. 20 deg); 23.48, 4.5: (Hale, 10x50 binoculars; 15' tail in p.a.
295 deg).

                      (C) Copyright 2004 CBAT
2004 April 23                  (8329)            Daniel W. E. Green

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