Central Bureau for Astronomical Telegrams
IAUC 4655: SNe; 1980 PA AND 1985 DO2; P/SCHWASSMANN-WACHMANN 1
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Circular No. 4655
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
SUPERNOVAE
A. V. Filippenko and J. Schachter, University of California at
Berkeley, write: "A spectrum (range 599-917 nm, resolution 1.5 nm)
obtained on Sept. 14 UT with a Cassegrain CCD spectrograph on the
Shane 3-m reflector at Lick Observatory confirms that SN 1988R (IAUC
4646) is a type Ia supernova, probably about 1 month past maximum
brightness. The redshift of the host galaxy is 0.024. SN 1988S
(IAUC 4651) in MCG 1-60-40 is a type II supernova, 1-2 months past
maximum, at a redshift of 0.043."
M. Turatto and E. Cappellaro report that CCD frames obtained with
the Asiago Astronomical Observatory 1.82-m telecope on Sept. 16 show
SN 1988S at V = 19.7, V-R = +0.8, R-I = +0.4.
1980 PA AND 1985 DO2
D. J. Tholen, University of Hawaii, writes: "Photometry
(low signal-to-noise ratio; 0.3 to 0.9 micron) of 1980 PA obtained on
July 29 UT with the 2.24-m telescope suggested the presence of a
strong absorption band longward of 0.7 micron. Photometry (high
S/N) over the same wavelength range on Sept. 5 has confirmed the
presence of this band, the deepest ever observed between 0.7 and
0.9 micron. Coincidentally, similar observations of 1985 DO2 obtained
on the same night show it to have the second deepest absorption
feature among the asteroids. The colors of both objects are
similar to those of (4) Vesta and (3551) 1983 RD, the only other
asteroids in this class. The compositional similarity to Vesta
was strengthened on Sept. 8 when W. K. Hartmann, D. P. Cruikshank,
and I acquired 0.8- to 2.5-micron CVF data on both objects using
the Infrared Telescope Facility. Preliminary ratios of the asteroid
data to the solar analog 16 Cyg B show strong pyroxene bands in
both spectra, with the possibility of a plagioclase feature as well.
Both the ultraviolet and infrared data of 1985 DO2 suggest the
presence of a small amount of olivine, making this object somewhat
more Dembowska-like than 1980 PA."
PERIODIC COMET SCHWASSMANN-WACHMANN 1
Total visual magnitude estimates (cf. IAUC 4637): Aug. 12.46 UT,
13.7 (D. Seargent, The Entrance, NSW, 0.20-m reflector); 24.45, 13.3
(A. Hale, Las Cruces, NM, 0.41-m reflector); Sept. 11.18, 12.8 (C. S.
Morris, Pine Mountain Club, CA, 0.26-m reflector); 17.30, 13.3 (J. V.
Scotti, Tucson, AZ, 0.4-m reflector); 20.31, 13.3 (D. H. Levy,
Tucson, AZ, 0.4-m reflector).
1988 September 20 (4655) Daniel W. E. Green
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