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IAUC 7226: C/1999 N4; V382 Vel; C/1995 O1

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                                                  Circular No. 7226
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/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7244/7440/7444 (for emergency use only)


COMET C/1999 N4 (LINEAR)
     Another LINEAR discovery with unusual motion placed in The NEO
Confirmation Page has been found to have a retrograde orbit:

     1999 UT             R.A. (2000) Decl.        m2
     July 12.25443   19 13 44.43   + 1 07 42.1   18.2

At the request of the Central Bureau, some of the observers making
astrometric observations examined their images carefully and have
concluded that the object is a comet.  M. Tichy (Klet, 0.6-m reflector)
noted comae of diameter about 6" on July 14.9 and about 7" on July 15.9 UT.
L. Sarounova (Ondrejov, 0.6-m reflector) indicated a small coma, some lack
of condensation but no tail on July 16.9.  F. B. Zoltowski (Woomera, 0.3-m
reflector) remarked on a compact, diffuse image with an asymmetrical
distribution that may indicate a small, faint tail at p.a. around 90 deg
on July 17.6.

     Further astrometric observations, the following preliminary (and rather
rough) parabolic orbital elements and an ephemeris are given on MPEC 1999-O06:

     T = 2000 May   3.239 TT          Peri. =  87.861
                                      Node  = 345.805   2000.0
     q = 5.57961 AU                   Incl. = 156.895


V382 VELORUM
     A. C. Gilmore, Mount John University Observatory, provides further
photometric observations, continuing the series on IAUC 7216:
July 8.449 UT, V = 7.50, U-B = -0.89, B-V = -0.17, V-R = +1.33, V-I = +0.74,
airmass = 2.00; 9.386, 7.50, -0.91, -0.19, +1.29, +0.68, 1.51; 13.418,
7.53, -0.90, -0.18, +1.25, +0.65, 1.83; 14.336, 7.61, -0.91, -0.20, +1.36,
+0.67, 1.32.  Standard deviations are generally less than 0.01 mag.


COMET C/1995 O1 (HALE-BOPP)
     Total visual magnitude estimates: Mar. 17.46 UT, 11.2 (D. A. J. Seargent,
Cowra, N.S.W., 25 x 100 binoculars); Apr. 4.47, 11.5 (A. Pearce,
Guilderton, Western Australia, 0.20-m reflector); 14.47, 11.8 (S. T. Rae,
Palmerston North, New Zealand, 0.25-m reflector); 21.59, 11.9 (M. Mattiazzo,
Wallaroo, South Australia, 0.20-m reflector); May 8.37, 12.2 (Rae); 22.32,
12.0 (Rae); June 2.43, 12.4 (Mattiazzo); 7.30, 12.1 (Rae); 15.40, 11.5
(Seargent); 19.75, 12.4 (Rae); July 9.41, 12.4 (Mattiazzo).

                      (C) Copyright 1999 CBAT
1999 July 17                   (7226)              Brian G. Marsden

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