Circular No. 5054 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 1990R IN UGC 11699 J. Mueller reports her discovery of a supernova (mag about 17.5) in UGC 11699 (R.A. = 21h09m.9, Decl. = +12 24', equinox 1950.0). The supernova, located 10".1 east of the galaxy's center, was found on a blue plate exposed on June 26 UT with the 1.2-m Oschin Telescope in the course of the second Palomar Sky Survey. A. V. Filippenko and J. C. Shields, University of California, Berkeley, report that CCD spectra (range 390-980 nm, resolution 1-2 nm), obtained on July 17 UT with the Shane 3-m reflector at Lick Observatory, show SN 1990R to be of type Ia, probably 1-2 months past maximum brightness. SUPERNOVAE 1990N, 1990O, 1990P Filippenko and Shields also confirm that SN 1990N and SN 1990O (IAUC 5039) are of type Ia. SN 1990P (IAUC 5039), however, could not be seen to a limiting R magnitude of approximately 20. 1990 MF The following ephemeris continues that on IAUC 5050. It is noted that the object attains a maximum phase angle of 128.0 deg on July 20. 1990 ET R.A. (1950) Decl. Delta r V July 22 4 43.75 +51 23.5 24 4 42.57 +47 28.9 0.074 0.970 16.6 26 4 42.23 +44 23.1 28 4 42.43 +41 53.2 0.093 0.961 16.7 30 4 43.04 +39 49.9 Aug. 1 4 43.96 +38 07.0 0.112 0.955 16.8 3 4 45.15 +36 40.0 5 4 46.55 +35 25.5 0.131 0.951 16.8 7 4 48.14 +34 21.1 9 4 49.89 +33 24.9 0.150 0.950 16.8 11 4 51.78 +32 35.4 13 4 53.78 +31 51.6 0.169 0.951 16.8 15 4 55.88 +31 12.4 17 4 58.04 +30 37.2 0.188 0.955 16.8 1990 July 18 (5054) Daniel W. E. Green
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