IAU Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 5553: 1992k; N Sco 1992

The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).


Read IAUC 5552  SEARCH Read IAUC 5554
IAUC number


                                                  Circular No. 5553
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
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
MARSDEN@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)


COMET MACHHOLZ (1992k)
     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.


NOVA SCORPII 1992
     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

Read IAUC 5552  SEARCH Read IAUC 5554


Our Web policy. Index to the CBAT/MPC/ICQ pages.


Valid HTML 4.01!