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IAUC 5817: 1993 KA2; 1993J; FG Sge

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                                                  Circular No. 5817
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM     EASYLINK 62794505
MARSDEN@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)


1993 KA2
     An asteroidal object discovered by D. Rabinowitz with Spacewatch
near R.A. = 14h54m, Decl. = -10.1 deg (equinox 2000.0), V =
18.5 on May 21.2 UT moved some 5 deg to the east and south and faded
by 1 mag over the course of 5.5 hr.  From an orbit determination
by B. G. Marsden, Center for Astrophysics, Rabinowitz appears to
have been able to recover the object at V = 20 the following night,
but only a single detection could then be made, after which Marsden
determined the following improved orbital elements:  Epoch = 1993
Aug. 1.0 TT, T = 1993 Apr. 4.60 TT, Peri. = 261.30 deg, Node =
239.63 deg, i = 3.19 deg (equinox 2000.0), q = 0.5017 AU, e =
0.7748, a = 2.2272 AU.  The object, with record faint absolute
magnitude H about 29.0 (cf. 1991 BA, IAUC 5172), was 0.0047 AU from
the earth at discovery and had made a record close approach of
0.0010 AU on May 20.9 TT; minimum distance from the moon was 0.0013
AU on May 20.7.


SUPERNOVA 1993J IN NGC 3031
     R. W. Tweedy, Steward Observatory; T. J. Balonek, Colgate
University; E. Hintz, M. Joner, and L. Joner, Brigham Young University;
and L. A. Wells, Kitt Peak National Observatory, report:  "UBVRI
CCD photometry at the Burrell-Schmidt telescope on Kitt Peak shows
that the U magnitude of SN 1993J has brightened steadily from U =
14.39 during May 23-26 to 14.32 during June 8-11.  There is an
approximately linear decrease in other bands (0.01 mag/day in B; 0.02
mag/day in V, R, and I).  On June 11, B = 13.83, V = 12.79, R =
12.23, I = 11.83, with errors < 0.02 (cf. IAUC 5746, 5769).  JHK
photometry is being obtained at Kitt Peak.  A recent personal
communication from C. Wheeler, Univeristy of Texas, mentioned that an
increase in U might indicate that the remnant is powered by a
pulsar. However, x-ray observations are needed to confirm this."


FG SAGITTAE
   G. F. Lawrence and R. D. Gehrz, University of Minnesota; and C.
E. Woodward, University of Wyoming, are continuing their infrared
monitoring of FG Sge.  Magnitudes obtained with the Mt. Lemmon
Observatory 1.52-m telecope (+ InSb photometer):  May 31.5 UT, K =
5.78 +/- 0.04, L' = 3.48 +/- 0.04, M = 2.56 +/- 0.05; June 1.5 UT,
J = 8.16 +/- 0.03, H = 7.21 +/- 0.03, K = 5.75 +/- 0.02, L' = 3.61
+/- 0.02, M = 2.77 +/- 0.05.


1993 June 18                   (5817)            Daniel W. E. Green

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