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IAUC 6177: MICROLENSING EVENT IN THE GALACTIC BULGE; 1991 JX; 57P

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                                                  Circular No. 6177
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
Phone 617-495-7244/7440/7444 (for emergency use only)


MICROLENSING EVENT IN THE GALACTIC BULGE
     The OGLE microlensing search team (A. Udalski, M. Szymanski, J.
Kaluzny, M. Kubiak, W. Krzeminski, and M. Mateo; Warsaw University
Observatory, Carnegie Institution of Washington, and University of
Michigan) reports detection of another possible gravitational
microlensing event in progress with the OGLE Early Warning System:
"Observations collected with the 1-m Swope telescope at the Las
Campanas Observatory indicate that the star (R.A. = 18h02m07s.59,
Decl. = -30o01'13".0, equinox 2000.0) had brightened by about 0.7
mag from its normal brightness during 1992-1994 (I = 18.45, V-I =
+1.55).  The candidate seems to be on the rising branch of the
microlensing light curve, well ahead of maximum.  The event will
very likely have a long timescale.  We encourage follow-up
photometric and spectroscopic observations that may provide
valuable information about the microlensing object.  A finding
chart, light curve, and regularly updated photometry can be found
in the OGLE archive (anonymous ftp sirius.astrouw.edu.pl, directory
/ogle/ews/1995/bw5)."


1991 JX
     M. Hicks and W. Grundy, Lunar and Planetary Laboratory,
University of Arizona, write:  "CCD spectrograms (0.55-1.05 microns,
resolution 1.5 nm) of the earth-approaching asteroid 1991 JX were
taken at the Catalina Station 1.54-m telescope on May 29, 30, and
31.  Analysis of the spectra shows that the relative reflectance of
1991 JX is in complete agreement with the spectral family of Vesta-
like objects as identified by Binzel and Xu (1993, Science 260,
186).  Our observations represent a total of 6.8 hr of integration.
The composite spectrum shows a reddish slope, increasing by a factor
of 12 percent over a range from 0.55 to 0.70 micron.  The apparent
pyroxene absorption band is centered at 0.92-0.94 micron, with the
characteristic upturn at longer wavelengths."


COMET 57P/DU TOIT-NEUJMIN-DELPORTE
     Unfiltered CCD total magnitudes reported by J. V. Scotti, Kitt
Peak (0.9-m Spacewatch telescope):  May 23.20 UT, 21.4; 23.24, 21.0.
The comet appeared very nearly stellar, with a coma diameter of 8"
on May 23.


1995 June 8                    (6177)            Daniel W. E. Green

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