Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 4818: 4U 1850-08; JUPITER; 1989o; QV Vul = N Vul 1987

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 4817 SEARCH Read IAUC 4819
IAUC number 

                                                  Circular No. 4818
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 or GREEN@CFA.BITNET    MARSDEN or GREEN@CFAPS2.SPAN


4U 1850-08
     G. Machin, H. Lehto, I. McHardy and P. Callanan, Department of
Astrophysics, University of Oxford; and P. Charles, Royal Greenwich
Observatory, report: "VLA observations of the globular cluster NGC 6712
were obtained in February at a wavelength of 60 mm.  A 140 +/- 30
microJy source was discovered in the core of the cluster at the
position R.A. = 18h50m21s.07, Decl. = -8d46'04".5 (equinox 1950.0,
uncertainty +/- 0".15).  The coincidence of this position with the
proposed optical counterpart (uncertainty +/- 0".3; Cudworth 1988, A.J.
96, 105) to the x-ray source 4U 1850-08 (Hertz and Grindlay 1983, Ap.J.
275, 105) provides strong support to the optical identification.  This
is only the second radio counterpart for a globular cluster x-ray
source to be found."


JUPITER
     M. Kidger, Instituto de Astrofisica de Canarias, Tenerife,
informs us that observations on July 21.22 UT by J. Sanchez and A.
Carrera (Santa Cruz, Tenerife) confirm the disappearance of Jupiter's
SEB and show that this was over longitude 325 +/- 90 deg (cf. IAUC
4815), indicating that the SEB has disappeared completely at all
longitudes.


PERIODIC COMET BRORSEN-METCALF (1989o)
     The statement on IAUC 4804 creates the unfortunate impression
that the delta T prediction by Festou, Rickman and Kamel for
P/Brorsen-Metcalf was in direct response to a suggestion by
others.  While Sekanina and Yeomans have been examining the stated
problem, it is necessary to stress that the ideas of Festou et al.
were developing as long ago as 1986 and that their application to
P/Brorsen-Metcalf was carried out quite independently.
     Total visual magnitude estimates: July 17.35 UT, 8.4 (G. W. Kronk,
Troy, IL, 0.33-m reflector); 20.46, 8.5 (C. E. Spratt, Victoria, BC, 11 x
80 binoculars); 23.43, 8.0 (Spratt, 0.08-m refractor; strong moonlight);
25.44, 7.5 (C. S. Morris, near Mt. Wilson, CA, 20 x 80 binoculars).


QV VULPECULAE = NOVA VULPECULAE 1987
     Visual magnitude estimates: June 14.06 UT, 13.8 (M. Verdenet,
Bourbon-Lancy, France); 17.90, 13.6 (A. Boattini, Florence, Italy); 27.89,
13.9 (Boattini); July 7.99, 14.0 (P. Schmeer, Bischmisheim, West Germany).


1989 July 25                   (4818)              Brian G. Marsden

Read IAUC 4817 SEARCH Read IAUC 4819

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

Valid HTML 4.01!