Central Bureau for Astronomical Telegrams
IAUC 5058: 1990S; UX Ant; NO Occn OF SAO 187435 BY TRITON; 1990i
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Circular No. 5058
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
SUPERNOVA 1990S IN MCG -05-29-006
M. Hamuy, Cerro Tololo Interamerican Observatory; and J. Maza,
Astronomy Department, University of Chile, report: "Roberto
Antezana has discovered a supernova 7" west and 5" north of the
nucleus of the spiral galaxy MCG -05-29-006 (ESO 440-G48). The
supernova (estimated magnitude B = 15.5) was found on a 15-min
103a-O plate taken by Hamuy and L. Wells with the Curtis Schmidt
telescope on July 22.046 UT. The SN is at R.A. = 12h02m58s.6,
Decl. = -29 52'58" (equinox 1950.0). Confirmation was made by T.
Williams (Rutgers University), who obtained UBVRI CCD images with
the CTIO 0.9-m telescope on July 25, showing the SN to be very blue.
A spectrum (range 630-950 nm) obtained on the same night by M.
Phillips with the CTIO 4-m telescope shows a featureless continuum,
along with narrow H-alpha and [N II] emission lines. These data
do not allow a definitive classification, but it would appear most
likely that this is a type-II supernova in an early stage of its
evolution."
UX ANTLIAE
Observations by E. R. Minniti, Sante Fe, Argentina, telexed
by L. A. Milone, Observatorio Astronomico, Universidad Nacional
de Cordoba, indicate that this suspected R CrB-type variable
is fading. Visual magnitude estimates by Minniti unless otherwise
noted: May 21.0 UT, 11.2; June 9.0, 11.4; 16.0, 11.6; 19.0, 11.7;
July 11.0, [12.7; 19.0, [13.0; 22.0, 14.0: (S. Paolantonio, Cordoba
Observatory). Monitoring by Minniti since 1975 has revealed no
brightness variations > 0.1-0.2 mag (normal mv = 11.3).
NO OCCULTATION OF SAO 187435 BY TRITON
L. Wasserman, Lowell Observatory, reports that, based on
measurements of a plate obtained by A. Klemola with the Lick
Observatory Astrograph, the proposed occultation of SAO 187435
by Triton (Neptune I) on 1990 Aug. 1 (Wasserman et al. 1990, A.J.
99, 732) will not occur.
COMET TSUCHIYA-KIUCHI (1990i)
Total visual magnitude estimates: July 16.73 UT, 10 (X.-m.
Zhou, Bo Lo County, Xin Jiang province, China; independent
discovery); 19.26, 8.8 (C. Spratt, Victoria, BC, 0.15-m reflector);
22.23, 8.7 (Spratt, 0.20-m reflector); 24.12, 8.9 (G. Kronk, Troy,
IL, 0.33-m reflector).
1990 July 25 (5058) Daniel W. E. Green
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