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IAUC 6229: 1995 S1; 6P; C/1995 O1; 58P

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IAUC number 

                                                  Circular No. 6229
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 1995 S1
     The following additional approximate positions have been
reported:

     1995 UT           R.A. (2000) Decl.        m1       Observer
     Sept.18.50        9 07        - 1 57       6.5      Morris
          18.517       9 06.1      - 1 46       6        Machholz

C. S. Morris (Whitaker Peak, CA).  20x80 binoculars.  Very
   approximate position.  Comet strongly condensed, coma diameter
   about 4'; extremely faint tails 70' and 45' long in p.a. about
   295 and 5 deg, respectively.
D. E. Machholz (Colfax, CA).  Independent discovery with 27x120
   binoculars; coma diameter about 10'.


COMET 6P/D'ARREST
     M. Fomenkova, University of California, San Diego; and M. J.
Mumma, Goddard Space Flight Center, NASA, write:  "We obtained
infrared images and spectra with the NASA Infrared Telescope
Facility (+ NSFCAM) on Aug. 29-Sept. 1 UT.  On Sept. 1.5, the
fluxes (measured in W mE-2 micronE-1) through J, K, and L filters
in a box of size 1".2 x 1".2 centered on the nucleus were:  J, 6.8
x 10E-15; K, 1.3 x 10E-15; L, 3.6 x 10E-15.  On Aug. 31, low-
resolution spectra (3.2-3.8 microns) were acquired using the grism
and the L filter.  The cometary spectrum is significantly redder
than an F5 comparison star.  The comet shows excess emission above
the thermal continuum at 3.4 microns and possibly also at 3.52
microns."


COMET C/1995 O1 (HALE-BOPP)
     Fomenkova and Mumma also communicate:  "We obtained infrared
images of this comet (details as above) on Sept. 1.3 UT, yielding
the following fluxes (in W mE-2 micronE-1) in a box of size 1".2 x
1".2 centered on the nucleus:  J, 3.5 x 10E-15; K, 5.6 x 10E-15."


COMET 58P/JACKSON-NEUJMIN
     Total visual magnitude estimates:  Sept. 4.39 UT, 13.5 (C. S.
Morris, Pine Mountain Club, CA, 0.26-m reflector); 16.23, 13.4
(Morris); 17.24, 12.9 (A. Hale, Cloudcroft, NM, 0.41-m reflector).


1995 September 18              (6229)            Daniel W. E. Green

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