Central Bureau for Astronomical Telegrams
IAUC 5124: 1990af; 1990 UA; 1990i
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Circular No. 5124
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 1990af IN ANONYMOUS GALAXY
J. Maza, University of Chile; and M. Hamuy, Cerro Tololo
Interamerican Observatory, report the discovery by Roberto Antezana
of a supernova (B about 17) at R.A. = 21h31m07s.7, Decl. =
-62 57'37" (equinox 1950.0), which is 7" west and 7" north of the
nucleus of an anonymous galaxy. The supernova was found on an
103a-O plate taken by Hamuy and S. Ormeno with the CTIO Curtis
Schmidt telescope on Oct. 24.072 UT. Confirmation was made by R.
Lamontagne, whose B and V CCD images with the CTIO 0.9-m telescope
on Oct. 28 yield B about 18, B-V = +0.2 to +0.3; the object was
somewhat brighter in both B and V on Oct. 29. Two spectra (range
450-900 nm) were obtained on the same night by Maza and Hamuy with
the CTIO 4-m and 1.5-m telescopes, showing a blue spectrum with
the Si II 635-nm absorption that is present in type-Ia supernovae.
The observations indicate that the supernova is before or near
maximum brightness. The parent galaxy has a redshift of 0.048.
1990 UA
Improved orbital elements from MPC 17218:
T = 1990 Aug. 25.008 ET Peri. = 203.818
e = 0.55275 Node = 102.126 1950.0
q = 0.76971 AU Incl. = 0.969
a = 1.72099 AU n = 0.436551 P = 2.26 years
1990 ET R.A. (1950) Decl. Delta r V
Oct. 26 1 31.75 + 1 49.0 0.144 1.136 16.2
31 1 33.23 + 3 49.4
Nov. 5 1 34.69 + 5 09.1 0.241 1.223 17.6
10 1 36.34 + 6 08.4
15 1 38.33 + 6 56.9 0.347 1.309 18.7
20 1 40.76 + 7 39.6
25 1 43.65 + 8 19.0 0.465 1.394 19.5
COMET TSUCHIYA-KIUCHI (1990i)
Total visual magnitude estimates (cf. IAUC 5116): Oct. 16.15
UT, 7.4 (R. Haver, Villa S. Giovanni, Italy, 15x80 binoculars);
27.04, 6.9 (D. H. Levy, Tierra del Sol, CA, 0.31-m reflector).
1990 October 29 (5124) Daniel W. E. Green
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