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Circular No. 7497 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) CBAT@CFA.HARVARD.EDU (science) URL http://cfa-www.harvard.edu/iau/cbat.html ISSN 0081-0304 Phone 617-495-7440/7244/7444 (for emergency use only) COMET P/2000 S1 (SKIFF) Prediscovery observations made by LINEAR on Aug. 26, together with additional astrometry on Sept. 26, are given on MPEC 2000-S60, along with the following orbital elements: T = 2000 July 8.217 TT Peri. = 305.699 e = 0.62614 Node = 29.547 2000.0 q = 2.48410 AU Incl. = 20.689 a = 6.64442 AU n = 0.057547 P = 17.13 years 2000 TT R. A. (2000) Decl. Delta r Elong. Phase m1 Sept.13 0 40.61 -15 22.3 1.588 2.550 158.1 8.5 15.1 23 0 32.32 -14 41.8 1.593 2.570 163.3 6.4 15.1 Oct. 3 0 23.71 -13 46.3 1.624 2.593 161.9 6.9 15.2 13 0 15.86 -12 35.3 1.680 2.619 155.1 9.2 15.3 23 0 09.62 -11 10.6 1.762 2.647 146.1 12.1 15.5 SUPERNOVA 2000dm IN UGC 11198 S. Jha, P. Challis, T. Matheson, and R. Kirshner, Harvard- Smithsonian Center for Astrophysics, report that spectra of SN 2000dm (cf. IAUC 7495), obtained by Z. Balog on Sept. 25.1 UT with the F. L. Whipple Observatory 1.5-m telescope (+ FAST spectrograph), show it to be a type-Ia supernova at maximum light. The spectra exhibit a blue continuum and Si II, S II, Fe II, Mg II, and Ca II features. Adopting the NASA/IPAC Extragalactic Database recession velocity of 4507 km/s for the host galaxy yields an expansion velocity for the supernova of 10 800 km/s, measured with the Si II (rest 635.5 nm) profile. The age of the supernova based on its spectral features (Riess et al. 1997, A.J. 114, 722) is 1 +/- 2 days before maximum light. The spectrum also shows significant interstellar Na I D absorption (equivalent width = 0.1 nm) from our Galaxy, and the reddening towards this direction is estimated to be E(B-V) = 0.19 mag (Schlegel et al. 1998, Ap.J. 500, 525). A. V. Filippenko and R. Chornock, University of California at Berkeley, also write: "Inspection of CCD spectra (range 330-1000 nm) of SN 2000dm, obtained on Sept. 26 UT with the Shane 3-m reflector at Lick Observatory, reveals that the object is a normal type-Ia supernova very close to maximum brightness. The presence of interstellar Na I absorption suggests that SN 2000dm is somewhat reddened." (C) Copyright 2000 CBAT 2000 September 26 (7497) Daniel W. E. Green
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