Central Bureau for Astronomical Telegrams
IAUC 6071: Poss. GRAVITATIONAL MICROLENSING EVENT; 1994X; 1994o
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Circular No. 6071
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)
POSSIBLE GRAVITATIONAL MICROLENSING EVENT
S. Benetti, L. Pasquini, and R. West, European Southern Observatory
(ESO), report: "Spectra of this object (cf. IAUC 6068, 6069)
have now been obtained with telescopes at La Silla during five
consecutive nights (Sept. 2-6). No spectral changes are evident in
the range 400-700 nm, lending support to the interpretation of this
event as being caused by a genuine MACHO (Massive Compact Halo
Object). A provisional, quantitative analysis (based on criteria
in the range 400-450 nm; West 1972, Bull. Abast. Obs. 43, 109) of a
high-S/N 15-min spectrum (resolution 1.7 nm), obtained with the ESO
3.6-m telescope (+ EFOSC2) on Sept. 5.1 UT, yields spectral class
K0 IV and M(V) = +3; this indicates that the star is likely to be
somewhat reddened and located in the galactic bulge."
SUPERNOVA 1994X IN ANONYMOUS GALAXY
A. V. Filippenko, A. J. Barth, and T. Matheson, University of
California at Berkeley; and J. A. Burrous, Lick Observatory, report
that preliminary inspection of CCD spectra (range 310-1000 nm)
obtained on Sept. 1 UT with the Shane 3-m reflector at Lick suggests
that this object is of type Ia, a few months past maximum brightness.
The redshift of the parent galaxy is 0.058, based on measurements of
the Ca II H+K absorption lines.
PERIODIC COMET MACHHOLZ 2 (1994o)
P. Pravec, Ondrejov, reports his discovery of fourth and fifth
components to this comet on CCD images obtained with the 0.65-m
reflector on Sept. 4.1 UT. The fourth component -- also independently
reported by W. Johnson (Anza, CA), by T. Puckett, J. Armstrong, and
M. Marcus (Atlanta, GA), and by M. Jager (Vienna, Austria) -- was
then similar in brightness to the third component (IAUC 6070),
about a magnitude fainter than the second component (IAUC 6066),
sporting a 2'.0 coma with little condensation, and located some
320" north-northeast of the primary component. The fifth fragment
(also evidently found by Jager on his films) was nearly 1 mag
fainter than the fourth component, consisted of a 1'-2' diffuse
coma and little or no condensation, and was located 307" north-
northeast of the second component.
1994 September 6 (6071) Daniel W. E. Green
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