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IAUC 5553: 1992k; N Sco 1992

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                                                  Circular No. 5553
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

     Donald E. Machholz reports his visual discovery of a comet.
The following observations have been reported:

     1992 UT           R.A. (2000) Decl.        m1       Observer
     July  2.459       4 43.7      +36 52       9        Machholz
           3.448       4 47.7      +36 06       9.2:     Hale
           3.469       4 48        +36.0        9        Machholz

D. E. Machholz (Colfax, CA).  27x120 binoculars on July 2; 0.15-m
   reflector on July 3.  Comet diffuse with condensation; 3' coma.
   Clouds on July 3.
A. Hale (Las Cruces, NM).  0.41-m reflector.  Poor observing
   conditions. Comet diffuse with some condensation.

     A. Damineli N., Instituto Astronomico e Geofisico, Universidade
de Sao Paulo; F. Jablonsky, Instituto de Pesquisas Espaciais,
San Jose dos Campos; and M. P. Diaz, Instituto Astronomico e
Geofisico, Universidade de Sao Paulo, write:  "We have obtained low-
resolution (1 nm) CCD spectrograms of Nova Sco 1992 covering the
range 480-1090 nm, using the 1.6-m telescope of LNA/CNPq in Brazil.
On May 28.0 UT, the visible spectrum was like that described on
IAUC 5529 and the near-infrared was characterized by strong emission
of O I at 844.6 nm and the Ca II triplet.  Less intense emission
of Fe II (74, 49, 42), N I, and Paschen lines were also present.
An unidentified blend at 1069-1076 nm was the dominant feature
in the spectrum, being stronger than H-alpha.  Coude CCD spectra
(resolution 0.1 nm) taken on June 1.1 show P-Cyg absorptions
with minima at -290 km/s (O I at 844.6 nm), -355 km/s (Ca II
triplet), and -345 km/s (H-alpha).  Lines not showing P-Cyg profiles
have FWHM 700 km/s.  The coude spectra give the following equivalent
widths in nm:  H-beta, -7.3; H-alpha, -46.6; O I at 844.6 nm,
-10.2; Ca II at 849.8 nm, -12.4; Ca II at 854.2 nm, -13.3; Ca II at
866.2 nm, -15.3; Fe II at 999.7 nm, -3.5; Pa-delta, -5.0.  The Na D
interstellar doublet is superimposed on a broad emission and has a
heliocentric velocity of -11 km/s.  The equivalent width for the D1
component was 0.058 nm.  A broad Na D absorption system is seen at
-408 km/s."

1992 July 3                    (5553)            Daniel W. E. Green

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