Central Bureau for Astronomical Telegrams
IAUC 4654: 1988R; MARS; N Oph 1988
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Circular No. 4654
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 1988R IN MCG 9-23-9
J. Walsh, D. King, R. Clegg, and D. Middlemas telex: "We
observed SN 1988R on Aug. 23.87 UT with the Isaac Newton Telescope
on La Palma using the intermediate dispersion spectrograph (+ blue
coated GEC CCD) covering wavelength range 350-750 nm (dispersion
13.7 nm/mm). There are broad peaks at 415, 453, 520, 585, and 650
nm and broad troughs at 380, 435, 451, 495, 548, 556, and 622 nm.
The peak at 415 nm is the strongest, its flux being about 2.5 times
that of the peak at 650 nm. There are no sharp features above the
noise level. There is a bluish continuum, but no strong emission;
B-V = +0.22. Comparison with SN 1975A (Kirshner et al. 1976,
Ap.J. 207, 44; Branch 1986, Ap.J. 300, L51) suggests that this is a
type-Ia supernova."
MARS
J. Lecacheux, Observatoire de Paris, writes: "We confirm
the obvious dark feature reported on IAUC 4645 at the Acampsis/
Gallinaria Silva location, although on Aug. 26, no dark extension
was visible westwards, in spite of excellent conditions at
Pic-du-Midi Observatory with the 1.06-m reflector. No large-scale
albedo change has occurred on the martian topography north of
Mare Sirenum and Mare Cimmerium. In contrast, a long, well-defined
white streak (7000 km long and 250 km wide; probably a 'belt' of
white clouds) is apparent on all of our CCD pictures, from L
= 130 deg, B = -13 deg to L = 250 deg, B = +4 deg; it is approximately
parallel (shifted 10 deg to 15 deg northward) to the feature
described on IAUC 4645."
S. Larson, G. Rosenbaum, and F. Vilas, University of Arizona,
write: "High resolution red-light CCD images of Mars with the
Catalina 1.5-m reflector on Sept. 10 UT do not show the feature
as described on IAUC 4645. An apron less than 0.3 times as dark
as Mare Sirenum extends along the north edge of Mare Sirenum about
10 deg to the north, but it is not as linear or narrow as indicated
earlier."
NOVA OPHIUCHI 1988
Visual magnitude estimates (cf. IAUC 4640): Aug. 7.42 UT, 12.7
(P. Williams, Heathcote, N.S.W.); 12.86, 12.8 (A. Boattini, Montecarmo,
Italy); 20.84, 12.7 (M. Verdenet, Bourbon-Lancy, France); 29.38, 11.6
(Williams); 30.53, 11.1 (A. Pearce, Woodlands, W. Australia); Sept.
2.54, 11.7 (Pearce); 6.41, 11.5 (Williams).
1988 September 15 (4654) Daniel W. E. Green
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