Luckas Observatory

SUPERNOVA DISCOVERIES SN2006ai Electronic Telegram No. 406 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION M.S. 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 SUPERNOVA 2006ai IN ESO 5-G9 P. Luckas, Perth, W. Australia; O. Trondal, Oslo, Norway; and M. Schwartz, Patagonia, AZ, report the discovery of an apparent supernova on unfiltered CCD frames taken with the 0.35-m Tenagra telescope at Perth on Feb. 17.54 (at mag 16.2) and 19.52 UT (mag 16.0) in the course of the Tenagra Observatory Supernova Search. SN 2006ai is located at R.A. = 7h29m52s.16, Decl. = -84o02'20".5 (equinox 2000.0), which is 2".5 west and 1".8 south of the center of ESO 5-G9 (which itself has position end figures 29m53s.77, 02'18".7). Nothing was visible at the position of 2006ai on an image taken by Luckas on 2005 Dec. 16.79 (limiting magnitude about 18.5). SUPERNOVAE 2006Y AND 2006ai N. Morrell and G. Folatelli, on behalf of the Carnegie Supernova Project, report that spectroscopy (range 380-930 nm) of SN 2006Y (cf. IAUC 8668), obtained on Feb. 27.14 UT with the Las Campanas 2.5-m du Pont telescope (+ WFCCD spectrograph), showing it to be a type-II event, nearly one month after explosion. A spectrum of the apparent nucleus of the host galaxy was also obtained, from which is derived a recession velocity of 10074 km/s (redshift 0.0336 +/- 0.0001). From nebular emission lines superimposed on the supernova spectrum, a slightly different redshift of 0.0333 +/- 0.0001 is derived; using this value, an expansion velocity of 7650 km/s for this supernova is derived from the minimum of the H_beta absorption. A redshift of 0.0341 +/- 0.0002 was also measured for ESO 207-G27 (a galaxy located southeast of the supernova host). A spectrum of SN 2006ai (cf. IAUC 8674), obtained on Mar. 5.12 with the same instrumental configuration, shows it to be a type-II supernova, at least one month after explosion, for which an expansion velocity of 8050 km/s is derived from the minimum of the H_beta absorption, considering a redshift of 7426 km/s (z = 0.0158 +/- 0.0001) measured from emission lines in the spectrum of the host galaxy.
2008bq	Type Ia	April 2, 2008	ESO 308-G25
2007as	Type Ia	March 13, 2007	ESO 18-G18
2006du	Type II	July 18, 2006	IC 1529
2006ck	Type Ic	May 20, 2006	UGC 8238
2006bs	Type II	April 19, 2006	MCG +0-27-14
2006ai	Type II	February 17, 2006	ESO 5-G9
2006y	Type II	February 3, 2006	Anon
2005my	Type II	December 30, 2005	ESO 302-G27
2005gm	Type IIn	October 9, 2005	NGC 1423
2005dk	Type II	August 21, 2005	IC 4882
2005dc	Type Ia	July 26, 2005	NGC 7107
Tenagra Western Australia \| Luckas Observatory

SUPERNOVA DISCOVERIES