Circular No. 7361

Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A. IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions) BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science) URL http://cfa-www.harvard.edu/iau/cbat.html Phone 617-495-7244/7440/7444 (for emergency use only)

SUPERNOVA 2000H IN IC 454

Independent discoveries of an apparent supernova in IC 454 have been reported by M. Armstrong, Rolvenden, Kent, England, on unfiltered CCD images taken on Feb. 7.97 and 8.03 UT (mag about 17) for the U.K. Nova/Supernova Patrol with a 0.30-m telescope, and by M. Papenkova and W. D. Li, University of California at Berkeley, on behalf of the Lick Observatory Supernova Search (cf. IAUC 6627, 7126), on unfiltered CCD images taken on Feb. 8.18 and 8.22 (mag about 17.3) with the 0.8-m Katzman Automatic Imaging Telescope (KAIT). KAIT measurements show that the new object is located at R.A. = 6h51m07s.67, Decl. = +12o55'18".5 (equinox 2000.0), which is 19".6 east and 0".2 south of the nucleus of IC 454. Armstrong provides the following position end figures from his exposure on Feb. 8.782: 07s.60, 18".4 (or 25" east and 2" north of the galaxy center). G. M. Hurst, Basingstoke, England, notes that confirming images taken by S. Foulkes, Ashperton Village, on Feb. 8.812 and by T. Boles, Wellingborough, on Feb. 9.11 show SN 2000H near mag 17. SN 2000H also appears on earlier KAIT images taken on Jan. 27.2 (mag about 19.0) and Feb. 2.2 (mag about 17.3). Earlier patrol images by Armstrong appear to show the new object on Jan. 23.016 (trace) and 25.938 (mag 18.5; limiting mag 19.0). SN 2000H does not appear on CCD frames taken on 1999 Dec. 5 (limiting mag 19.0) and 2000 Jan. 4/5 by Armstrong, or on a KAIT image taken on Jan. 8.2 (limiting mag about 20.0). Armstrong adds that nothing is visible at the location of SN 2000H on the second Palomar Sky Survey image.

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Host galaxy info: V = 3945 km/s, 1.7'x0.9', SBab

SN type info: IIb

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