Central Bureau for Astronomical Telegrams

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IAUC 4840: 1989r; 1989o; N Sco 1989

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                                                  Circular No. 4840
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM     EASYLINK 62794505

     A new comet has been discovered independently by David Levy and
by Michael Rudenko.  The following observations are available:

     1989 UT           R.A. (1950) Decl.        m1       Observer
     Aug. 25.21       15 27.7      +34 12      10.6      Levy
          26.16       15 25.6      +34 11      10.5        "
          26.167      15 25        +34 05      11        Rudenko
          26.285      15 25.1      +34 13      10.7      Morris

D. Levy (Tucson, AZ).  0.4-m reflector.  Comet diffuse with slight
   condensation, no tail.
M. Rudenko (Ashfield, MA).  0.25-m refractor, 30 x.  Diameter 2'.
C. S. Morris (Pine Mountain Club, CA).  0.26-m reflector.  Diameter 3'.3.

     H. Campins, R. C. Sisk, C. M. Telesco and M. Joy, University of
Florida, Gainesville, report thermal infrared imaging obtained in the
daytime on Aug. 18 and 19 using the NASA MSFC 20-pixel bolometer array
at the 3.0-m Infrared Telescope Facility on Mauna Kea.  The images have
maximum dimensions of 80" in R.A. and 45" in Decl.  The brightest pixel
(4".3 x 4".3) had approximate flux densities of 2.5 Jy at 10.8 microns
on both days and 3.6 Jy at 20 microns on the second day.  The
uncertainty in these preliminary values is estimated to be 30 percent.
     Total visual magnitudes: Aug. 22.35 UT, 5.9 (J. E. Bortle, Stormville,
NY, 10 x 50 binoculars); 23.45, 6.0 (C. E. Spratt, Victoria, BC, 11 x 80
binoculars); 24.32, 5.9 (D. W. E. Green, Plum Island, MA, 7 x 50
binoculars); 25.49, 5.7 (C. S. Morris, near Mt. Wilson, CA, 10 x 50 binoculars).

     The following precise position, obtained by R. H. McNaught, was
originally communicated to the Central Bureau on Aug. 21 in a message
that failed to arrive: R.A. = 17h48m33s.96, Decl. = -32d31'16".2 (equinox
1950.0; uncertainty +/- 0".3 in each coordinate).  The measurement is
from an 11-s exposure with the Uppsala Southern Schmidt, and the reduction
is based on seven Perth 70 stars.
     Visual magnitude estimates by S. Kiyota (Tsukuba, Japan): Aug.
21.52 UT, 11.0; 22.48, 11.5; 23.50, 11.8.

1989 August 26                 (4840)              Brian G. Marsden

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