Central Bureau for Astronomical Telegrams
IAUC 4988: Prob. RADIO SN IN NGC 3690; TWO PULSARS IN NGC 6624; 1989c1
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Read IAUC 4989
Circular No. 4988
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
PROBABLE RADIO SUPERNOVA IN NGC 3690
Z. P. Huang, J. J. Condon, and Q. F. Yin, National Radio
Astronomy Observatory, Charlottesville; and T. X. Thuan, University
of Virginia, report the detection of a probable radio supernova
in NGC 3690 at R.A. = 11h25m43s.57, Decl. = +58 50'08".2 (equinox
1950.0). Its 8.44-GHz flux density was 1.8 mJy on Mar. 1; it was
not detectable at 1.49 GHz on 1989 Feb. 6.
TWO PULSARS IN NGC 6624
J. D. Biggs and A. G. Lyne, University of Manchester, Jodrell
Bank; R. N. Manchester, Australia Telescope National Facility; and
M. Ashworth, Manchester Computer Center, write: ''We report the
discovery of two pulsars in the globular cluster NGC 6624. The
pulsars, with periods of 5.4400 and 378.59 ms and dispersion
measures of 86 +/- 1 and 86 +/- 3 cm-3 pc, respectively, were
detected in observations at 610 MHz made at Jodrell Bank in 1987
June and confirmed in observations at 640 MHz made with the Parkes
radiotelescope in 1989 December. Both pulsars are either solitary
or in long-period binary systems and have flux densities of about
2 mJy at 610 MHz. The combined flux from these pulsars can probably
be identified with at least part of a continuum source in the core
of the cluster recently detected at the Very Large Array by
Fruchter and Goss (1989, Bull. A.A.S. 21, 1204)."
COMET AUSTIN (1989c1)
R. D. Gehrz and E. P. Ney, University of Minnesota, report
the following infrared magnitudes obtained on the 0.76-m telescope
of O'Brien Observatory on Apr. 3.71 UT (20" diaphragm, 32" beam
throw, which are the same as used on Mar. 23.83 and reported on
IAUC 4987): 1.6 microns, +5.60; 2.2 microns, +5.17; 3.5 microns,
+2.06; 4.8 microns, -0.13; 8.5 microns, -2.34; 10.5 microns, -2.91;
12.5 microns, -3.11; 18 microns, -3.51.
Total visual magnitude estimates (cf. IAUC 4985): Mar. 30.23
UT, 4.8 (D. J. Tholen, Mauna Kea, HI, 20x80 finder); Apr. 1.15, 4.8
(C. S. Morris, Pine Mountain Club, CA, 20x80 binoculars; 2-deg tail);
4.17, 4.6 (C. Spratt, Victoria, BC, 11x80 binoculars); 4.83, 4.4
(J. Shanklin, Cambridge, England, 20x80 binoculars); 5.84, 4.4 (G.
Keitch, Wrington, Avon, England, 20x80 binoculars; 40' tail in p.a.
41 deg).
1990 April 6 (4988) Daniel W. E. Green
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