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IAUC 6686: N Sco 1997; C/1995 O1; C/1997 J2; 2P

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                                                 Circular No. 6686
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, 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)
URL http://cfa-www.harvard.edu/cfa/ps/cbat.html
Phone 617-495-7244/7440/7444 (for emergency use only)


NOVA SCORPII 1997
     R. W. Argyle, Royal Greenwich Observatory, reports an accurate
optical position for N Sco 1997 obtained from 9 observations with
the Carlsberg Automatic Meridian Circle on La Palma:  R.A. =
17h54m11s.203 +/- 0s.006, Decl. = -30o02'53".17 +/- 0".11 (equinox
J2000.0, Hipparcos reference frame, epoch 1997.46).  The following
V magnitudes (+/- 0.08 mag) were obtained:  June 15.06 UT, 11.95;
16.06, 12.14; 17.06, 12.18; 18.06, 12.26; 19.05, 12.45; 22.04,
12.76; 23.04, 12.43.


COMET C/1995 O1 (HALE-BOPP)
     M. Sakamoto, Misato Observatory; B. Suzuki, Misato
Technological High School; H. Kawakita, Osaka; R. Furusho, Kobe
University; N. Yamamoto, Science University of Tokyo; and J.
Watanabe, National Astronomical Observatory, communicate: "Neutral-
sodium emission images of comet C/1995 O1 were obtained since Feb.
20, using a narrow-band filter set that was designed for neutral-
sodium emission at 589 nm at the Misato 1.05-m reflector (+ liquid-
N_2-cooled CCD camera).  The size of the images correspond to
500 000 km x 500 000 km.  The most remarkable phenomenon is the
'sodium jet' structure released in the solar direction from the
nucleus.  The sodium distribution of the near-nucleus region
resembles the dust profile, though the sodium jet slips off of the
dust jet in the anti-solar direction.  In a similar way, the Na
distribution is more sensitive than is the dust tail to radiation
pressure.  More detailed information can be found at
http://www.obs.misato.wakayama.jp/HB/index-e.html."


COMET C/1997 J2 (MEUNIER-DUPOUY)
     K. Churyumov, Kiev University Observatory, reports that he and
V. Vlassyuk obtained two spectrograms (range 460--550 nm) of comet
C/1997 J2 on June 20.95 UT with the Special Astrophysical
Observatory's 6-m telescope (+ Planetary spectrograph with long
slit and CCD) at Mount Pastukhov; the spectra show solar continuum
and noticeable C_3 emission.


COMET 2P/ENCKE
     Visual m_1 estimates:  June 1.34 UT, 6.2 (D. A. J. Seargent,
Cowra, N.S.W., Australia, 25x100 binoculars); 9.43, 6.5 (A. Pearce,
City Beach, W. Australia, 0.2-m reflector); 23.45, 7.3 (Pearce,
20x80 binoculars).

                      (C) Copyright 1997 CBAT
1997 June 24                   (6686)            Daniel W. E. Green

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