Central Bureau for Astronomical Telegrams
IAUC 6203: C/1995 O1; 1995V; X-RAY N 1994 IN Sco
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Circular No. 6203
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)
COMET C/1995 O1 (HALE-BOPP)
C. Lidman and P. Bouchet, European Southern Observatory (ESO),
report observations of C/1995 O1 in the near infrared with the 2.2-
m telescope at La Silla (+ ESO IRAC2 camera with Nicmos3 array of
256x256 pixels; pixel size 0".52): "The observations were centered
at Aug. 5.14 UT. The following preliminary magnitudes (+/- 0.1 mag)
were obtained through a 10" aperture centered on the comet's
nucleus: J = 11.2, H =11.2, K = 11.1. The images show a clear
extension of the order of 1' toward the northwest, the coma size
being about 2".5 (seeing 0".8). Notable is that the comet is
colorless in the near-infrared."
SUPERNOVA 1995V IN NGC 1087
D. Balam, Climenhaga Observatory, reports the following precise
position, obtained with the 0.5-m reflector (+ CCD): R.A. =
2h46m26s.77, Decl. = -0o29'55".6 (equinox 2000.0), which is 23"
east and 0".2 south of the host galaxy's core. Preliminary
photometry in Johnson V and Cousins I bands: Aug. 4.47 UT, V =
15.68 +/- 0.09, V-I = +1.53 +/- 0.09 (comparison stars HD 18175, HD
18369). A nearby star of similar brightness (V = 14.94 +/- 0.04,
V-I = +0.30 +/- 0.04) has position end figures 26s.75, 25'37".4.
X-RAY NOVA 1994 IN SCORPIUS
J. Orosz, B. Schaefer, and S. Barnes, Yale University, report:
"We have observed the superluminous gamma-ray source GRO J1655-40
with the Cerro Tololo 0.9-m telescope (+ CFCCD imager) from June 26
to July 3 and from Aug. 4 to 7 UT. The source is currently almost
1 mag brighter in the V band than it was during the period Apr. 5-
24. The average magnitude was V = 15.9 during each of the two
recent runs, compared to the average of V = 16.7 during April.
This increase in brightness may be related to the recent increase
in the hard x-ray activity (IAUC 6196 and 6201), but it should be
noted that our observations in Mar./Apr. (IAUC 6173) showed no
response to the hard x-ray outburst observed at that time (IAUC
6152). The mean V-I color was +1.93 during each of the two recent
runs, a decrease of about 0.05 mag since Apr. The June/July V
light curve, folded on the 2.6-day period (IAUC 6173), has a
similar shape as the folded Apr. V light curve, but with half the
amplitude. Also, the modulation in V-I in June/July is only 0.04
mag, compared with 0.15 mag in Apr. Additional observations are
encouraged."
1995 August 8 (6203) Daniel W. E. Green
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