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Circular No. 8481 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) SUPERNOVAE 2004ht-2004io Further to IAUC 8362, J. Adelman-McCarthy, F. DeJongh, J. Frieman, H. Lampeitl, and D. Tucker, Fermilab; B. Dilday and R. Kessler, University of Chicago; J. Holtzman, New Mexico State University (NMSU); and M. Sako, Stanford University, on behalf of the SDSS Collaboration, report the discovery of 22 supernovae on g'- and r'-band images taken at the SDSS 2.5-m telescope. Spectroscopy was obtained during 2004 Oct. 14-Dec. 11 with the ARC 3.5-m telescope (+ DIS) at Apache Point and the Hobby-Eberly Telescope (+ LRS) at McDonald Observatory. Imaging was obtained with the ARC 3.5-m and the NMSU 1-m telescopes. Date of maximum observed g' flux and approximate g' magnitude on that date are tabulated below, together with supernova position, type, and redshift. Discovery dates: Sept. 22, 2004ht-hy, 2004ia; 24, 2004hz; Oct. 8, 2004ib, 2004id, 2004if; 10, 2004ic, 2004ie; 16, 2004ig, 2004ih; Nov. 3, 2004ii, 2004il-io; 5, 2004ij, 2004ik. SN 2004 UT R.A. (2000.0) Decl. g' Type z 2004ht Sept. 22 1 04 48.67 - 0 53 45.5 21.1 II 0.067 2004hu Sept. 22 1 15 02.42 + 0 15 42.9 19.3 Ia 0.049 2004hv Sept. 22 23 48 25.95 + 1 03 50.3 20.2 II 0.061 2004hw Sept. 22 23 51 17.35 + 1 13 39.4 20.1 Ia 0.060 2004hx Sept. 24 2 41 12.60 - 0 52 46.0 17.2 II 0.014 2004hy Sept. 24 21 06 04.25 + 1 12 57.0 20.3 II 0.058 2004hz Oct. 8 2 05 03.00 + 0 50 11.9 20.1 Ia 0.143 2004ia Oct. 8 2 18 02.30 - 0 33 32.4 19.5 Ia 0.143 2004ib Oct. 10 2 40 56.40 - 0 10 48.3 20.3 Ic 0.056 2004ic Oct. 10 20 40 48.05 + 1 02 34.2 20.5 II 0.093 2004id Oct. 16 0 06 29.64 - 0 28 22.3 19.6 Ia 0.144 2004ie Oct. 16 22 01 46.58 + 1 14 12.0 17.5 Ia 0.052 2004if Oct. 16 22 39 08.54 - 0 51 54.6 21.5 Ia 0.322 2004ig Oct. 24 0 05 51.79 - 0 59 45.1 20.6 Ia 0.183 2004ih Oct. 24 2 15 54.31 + 1 04 09.9 20.0 Ia 0.154 2004ii Nov. 3 0 16 51.80 - 0 24 56.9 20.7 Ia 0.197 2004ij Nov. 5 1 21 11.54 - 0 55 09.2 21.3 Ia 0.218 2004ik Nov. 5 1 44 55.51 - 0 05 58.1 21.3 Ia 0.169 2004il Nov. 5 3 07 02.69 - 0 00 40.1 19.5 Ia 0.108 2004im Nov. 5 23 43 07.78 - 0 07 55.5 19.8 Ia 0.14 2004in Nov. 11 1 30 26.06 + 0 41 32.3 20.3 Ia 0.161 2004io Nov. 20 21 23 37.39 - 0 28 00.6 19.7 Ia 0.150 (C) Copyright 2005 CBAT 2005 February 9 (8481) Daniel W. E. Green
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