Central Bureau for Astronomical Telegrams
IAUC 4645: 1987A; MARS; R CrB; N Her 1987
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Circular No. 4645
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
MARSDEN or GREEN@CFA.BITNET MARSDEN or GREEN@CFAPS2.SPAN
SUPERNOVA 1987A IN THE LARGE MAGELLANIC CLOUD
C. Smith, S. James and D. Aitken, University of New South
Wales; G. Orton, Jet Propulsion Laboratory; and P. Roche, Royal
Observatory, Edinburgh, telex: "A spectrogram (range 8-13 microns)
obtained with the Anglo-Australian telescope on July 24 shows that
the 10-13-micron continuum emission, which had been fading over
the past year, has brightened by almost a factor of two in
comparison with a similar spectrum taken on June 1. This may
indicate the onset of dust emission in the 10-micron region,
particularly if there has been no concomitant increase in the
2-4-micron continuum. The emission-line spectrum continues to
show a decrease in the fractional ionization."
MARS
S. J. O'Meara, Sky and Telescope, reports independent discoveries
of a new dark feature on Mars by D. Parker (Coral Gables, FL) and J.
Beish (Miami, FL) on July 2-4, I. Miyazaki (Okinawa, Japan) on July
10-13 and himself on Aug. 7. The feature, which is not
present on Mars maps dating back to Schiaparelli's of 1879, appears
to be a long lane swept clear of dust. It begins as a westward extension
of Acampsis, connects to Gallinaria Silva and crosses Memnonia to Titanum
Sinus. O'Meara, observing with the Mount Wilson 1.5-m reflector,
traced the feature as far as Cerberus III.
R CORONAE BOREALIS
Visual magnitude estimates: Aug. 7.95 UT, 10.0 (A. Pereira,
Linda-a-Velha, Portugal; on IAUC 4633, line 13, for Obeceixe read
Odeceixe); 8.95, 10.4 (C. Andrade e Silva, Linda-a-Velha, Portugal);
10.10, 10.4 (D. Kocyla, Southbury, CT); 11.14, 10.2 (L. Hiett,
Arlington, VA); 12.20, 10.3 (P. Sventek, Houston, TX); 12.98, 10.3
(Pereira); 13.94, 10.1 (Andrade e Silva); 14.95, 10.8 (J. D. Shanklin,
Cambridge, England); 15.91, 10.1 (P. Schmeer, Bischmisheim, West
Germany); 16.85, 10.6 (A. Boattini, Montecarmo, Italy); 17.89, 10.5
(Pereira); 19.12, 10.7 (R. King, Duluth, MN).
NOVA HERCULIS 1987
Visual magnitude estimates by Boattini: June 13.95 UT, 14.3; July
6.90, 14.4; 17.91, 14.5; Aug. 10.85, 14.4; 14.87, 14.6.
1988 August 19 (4645) Brian G. Marsden
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