Central Bureau for Astronomical Telegrams
IAUC 6216: C/1995 O1; GRO J1735-27
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Circular No. 6216
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)
R. M. West, European Southern Observatory (ESO), writes: "A
30-min red (IIIa-F + RG630) plate exposed with the ESO 1-m Schmidt
telescope on Aug. 18.10 UT by G. Pizarro, J. L. Beuzit, and P.
Bouchet has been photographically amplified at Garching by H.-H.
Heyer. On a subtractive print (in which the difference between
this and an earlier, similar plate is further enhanced), the comet
is found to have a large, diffuse coma, measuring about 9'.2 x 6'.0
(2.5 x 1.6 million km projected); the northeastern part is very
faint. The main elongation is at p.a. about 80 deg (i.e., in the
direction of the extended heliocentric radius vector). The point
of maximum intensity is situated very asymmetrically, about 2' from
the southwestern border of the envelope."
D. Jewitt and J. Chen, University of Hawaii (UH), communicate:
"R-band CCD images of C/1995 O1 were obtained using the UH 2.2-m
telescope on Aug. 28.25 UT. A spiral arm extends from the vicinity
of the nucleus at p.a. 280 deg and curves to the north, with radial
extent about 8". Measurements of this feature may place valuable
constraints on the rotation vector of the nucleus, and are
encouraged."
GRO J1735-27
S. Grebenev, K. Borozdin, and R. Sunyaev, Space Research
Institute, Moscow, on behalf of the Mir-Kvant/TTM and Granat/ART-P
teams, communicate: "The ROSAT position of a new x-ray pulsar GRO
J1735-27 (= RX J1735.9-2726; cf. IAUC 6207, 6212) is within the 1'
error circle for KS 1732-273, the source discovered by Mir-Kvant/
TTM on 1989 Mar. 20 and Sept. 4 (in't Zand et al. 1991, Adv. Space
Res. 11, (8)187); the mean flux from the source was about 22 mCrab
in the band 3-10 keV during both 1989 observations. The source was
marginally detected with Granat/ART-P on 1990 Apr. 4, when its flux
at 3-10 keV was 13.4 +/- 2.2 mCrab, but it was not found (at the
flux level of 26 mCrab, 3-sigma upper limit) on 1990 Oct. 11. Thus,
the 1989 and 1990 observations noted above, together with those on
1990 Sept. 5-7 by ROSAT and on 1995 Aug. 14 by GRO, are likely due
to episodic accretion during the periastron passage (by an
accreting neutron star in the binary system) and provide us with an
estimate of the binary period (5-6 months)."
1995 August 29 (6216) Daniel W. E. Green
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