Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 4453: N LMC; 1987A; PW Vul; 1987p

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 4452 SEARCH Read IAUC 4454
IAUC number 

                                                  Circular No. 4453
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM    Telephone 617-495-7244/7440/7444


NOVA IN THE LARGE MAGELLANIC CLOUD
     R. H. McNaught, Siding Spring Observatory, reports that
Gordon Garradd, Tamworth, N.S.W., has discovered a nova in the LMC
on photographs taken on Sept. 21.  Magnitude estimates (hypered
2415 film, G = Garradd, M = McNaught): Sept. 15.53, [15 (G); 16.55,
[12.6 (M); 17.52, 9.7 (M); 17.53, 9.5 (G); 18.77, 11.0 (M); 19.60,
11.5 (M); 19.61, 11.6 (M); 21.54, 11.9 (G); 21.56, 11.9 (G); 21.77,
12.1 (M).  A Lumicon H alpha-filter observation by McNaught on Sept.
21.80 gave mag 11.0, and his visual estimates are Sept. 24.39,
13.2; 24.59, 13.3; 24.76, 13.5.  McNaught's precise measurement of
an Uppsala Schmidt exposure obtained on Sept. 24.8 gives for the
nova's position R.A. = 5h24m18s.26, Decl. = -70 03'21"3 (equinox 1950.0).


SUPERNOVA 1987A IN THE LARGE MAGELLANIC CLOUD
     D. Allen, Anglo-Australian Observatory; and P. Whitelock and
R. Catchpole, South African Astronomical Observatory, telex: "
Infrared photometry with the Radcliffe 1.9-m and A.A.O. 3.9-m
telescopes clearly shows two components.  One, identified with the
photosphere, is fading in line with the optical.  The other, seen
only beyond 3 microns, is more constant in luminosity but may be growing
redder.  A black-body fit to the radiation at 3.8 and 4.8 microns
suggests a temperature of about 700 K.  We believe this component to
be the infrared echo from a surrounding dust cloud, presumably
ejected during a former M-supergiant phase.  At 4.8 microns the echo
first appeared about 5 days after outburst and peaked in August.  It
now accounts for 80-percent of the emission at that wavelength,
making speckle observations of the echo possible."


PW VULPECULAE
     Visual magnitude estimates: June 28.94 UT, 14.8 (M. Verdenet,
Bourbon-Lancy, France); July 3.95, 14.6 (G. M. Hurst, Basingstoke,
England); 16.91, 14.9 (R. Monella, Covo, Italy); 28.92, 14.7
(Hurst); Aug. 12.9, 14.8 (Verdenet); 23.88, 14.4 (J. Ripero,
Madrid, Spain); 29.8, 14.5: (A. Mizser, Budapest, Hungary).


PERIODIC COMET BORRELLY (1987p)
     Total visual magnitude estimates by A. Hale, Las Cruces, NM
(0.41-m refl.): Aug. 28.47, 12.5; Sept. 2.48, 12.5; 20.45, 12.1.


1987 September 24              (4453)              Brian G. Marsden

Read IAUC 4452 SEARCH Read IAUC 4454

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

Valid HTML 4.01!