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IAUC 8284: IRAS 05436-0007; 2003lu, 2003lv; C/2001 Q4

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                                                  Circular No. 8284
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)

IRAS 05436-0007
     A report was received from J. W. McNeil, Paducah, KY, of the
appearance of a new nebula in a dense region of the Lynds 1630
cloud in Orion, and apparently associated with IRAS 05436-0007, on
his unfiltered CCD images taken with a 7.6-cm refractor on Jan. 23
UT.  The object, which is located at R.A. = 5h46m14s, Decl. =
-0o05'.8 (equinox 2000.0), was then of total mag about 15-16 (with
his CCD camera's sensitivity peaking at 575 nm), but it is not
present on seven Digitized Sky Survey images from 1951 to 1991.  B.
Reipurth, University of Hawaii (UH), confirms that a faint optical
counterpart to IRAS 05436-0007 has gone into outburst and has
produced a large reflection nebulosity, based on preliminary
examination of red broadband CCD images obtained with K. Meech at
the UH 2.2-m telescope on Jan. 31.  Reipurth adds that this is a
very rare event, apparently similar to that involving IRAS
05380-0728 (cf. Reipurth and Bally 1986, Nature 320, 336).  The
outburst may be an EX-Lup-type or FU-Ori-type eruption, driven by a
sudden increase of accretion through a circumstellar disk, and thus
in urgent need of observation (see Herbig 1977, Ap.J. 217, 693;
Lehmann et al. 1995, A.Ap. 300, L9; Hartmann and Kenyon 1996, ARAA
34, 207).  Reipurth also notes that HH 22 is in the line-of-sight
of this new nebula but is not physically involved with the nebula
(Eisloeffel and Mundt 1997, A.J. 114, 280).

SUPERNOVAE 2003lu AND 2003lv
     Further to IAUC 8281, L. Strolger and A. Riess report another
apparent supernova (designated SN 2003lu) on 12 images taken during
2003 Sept. 13-14, located at R.A. = 3h32m36s.12, Decl. =
-27o55'01".4 (equinox 2000.0), which is 0".4 east and 0".3 south of
the center of a nearby galaxy.  ACS z-band magnitudes:  Sept. 1.89
UT, [27.5; 13.62, 26.1.
     Further to IAUC 8125, Riess reports the discovery of another
apparent supernova (mag z = 23.2) on 2003 Apr. 4.67, located at
R.A. = 12h37m28s.97, Decl. = +62o11'27".8.  SN 2003lv was observed
on nine additional dates, with the resulting light curve strongly
supporting its being a supernova.

COMET C/2001 Q4 (NEAT)
     Visual total-magnitude estimates:  Jan. 25.47 UT, 8.5 (D.
Seargent, Cowra, N.S.W., 6x35 binoculars); Feb. 3.97, 8.5 (W.
Souza, Santos, Brazil, 11x80 binoc.); 9.97, 8.0 (A. Amorim,
Florianopolis, Brazil, 7x50 binoc.).

                      (C) Copyright 2004 CBAT
2004 February 9                (8284)            Daniel W. E. Green

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