Supernova 1999cb in the galaxy Markarian 881.

The galaxy has a red shift of Z = 0.02881 ( RV = 8637 km/s ),
it is probably a Type Ia supernova with peak magnitude 15.7

Using Hubble constant Ho = 72(km / s) / Mpc
Distance = V / Ho Mpc = V / Ho * 3.2616*10^6 l.y. = 8637 / 72 * 3.2616*10^6 = 391 millioner light years.

Light curve.

Discovery image. Date : 4.April 1999 Time : 02:42 Field 7' x 7' The supernova 15" SW of galaxy is at mag.16.1 Integration time : 100 seconds. ST-4 CCD and 0.61m f/2.2 telescope. ( North up, East to the left. ) Nice weather, no wind Telescopes tracking was optimal Letter from AAVSO and IAU Circular No. 7163.

Discovery image by Michael Schwartz.

NOT = ( 2.5m Telescope at La Palma ) Date : 9.May 1999 Time : 20:55 The supernova is at mag.17.8 ? Integration time 60 seconds on ALFOSC 2102 X 2052 CCD Camera. V-filter ( #75 ) Picture by Ragnvald J. Irgens and Henning Holen More info on NOT.

Magnitudes from USNO-A2.0 and picture from Digitized Sky Survey. Red magnitude top. Blue magnitude bottom. 167 175 175 170 159 157 173 188 178 176 171 174

Image by NOT Date : 23.May 1999 Time : 05:09 The supernova is at V mag. ? Integration time 90 seconds on ALFOSC 2102 X 2052 CCD Camera. V-filter Picture by Margrethe Wold

Image by NOT Date : 23.May 1999 Time : 05:13 The supernova is at B mag. ? Integration time 60 seconds on ALFOSC 2102 X 2052 CCD Camera. B-filter Picture by Margrethe Wold

================================= Date Universal time Magnitude filter . observers etc. ================================= 04 Apr 1999 02:42UT 16.1 CR . Trondal ST-4 10 Apr 1999 01:13UT 15.7 CR . Trondal ST-4 25 Apr 1999 01:26UT 16.1 CR . Trondal ST-4 01.May 1999 01:24UT 16.8 CR . Trondal ST-4 05.May 1999 23:58UT 17.0 CR . Trondal ST-4 09.May 1999 20:55UT 17.8 V . Irgens Holen 2.5m NOT 14.May 1999 02.39UT 17.5 CR . Juan Goncalves J.Porto 0.3m SC SX CCD 16.May 1999 23:17UT 18.3? CR . Trondal ST-4 17.May 1999 23:40UT 18.5? CR . Trondal ST-4 23.May 1999 05:09UT 17.8? V . Margrethe Wold 2.5m NOT 23.May 1999 05:13UT 18.8? B . Margrethe Wold 2.5m NOT 25.May 1999 01:30UT 17.7 C . R. Szabo 1.0m Piszkesteto Hungary ( R mag. ) 04.June 1999 00:51UT 18.8 C . Juan Goncalves J.Porto 0.3m SC SX CCD CR = Unfiltered CCD ( Compaired with USNO-A2 Rmags ) V = V filter + CCD B = Blue filter + CCD

The supernova was probably type Ia. See Circular 7169.

See best Supernova images

Brightness and Spectrogram of SN1999cb.

Atlas of Spectrograms.

David Bishop's Supernova Webb Page.
and Supernova SN1999cb.

Melding fra Institutt for Teoretisk Astrofysikk.

NOT picture by Irgens Holen Dahle

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