AAVSO Special Notice #228

Supernova 2011K in anonymous galaxy is Type-Ia pre-maximum

January 14, 2011: We have been informed by the Central Bureau for Astronomical Telegrams (CBET 2636, Daniel W. E. Green, Ed.) that A. J. Drake, California Institute of Technology, et al. report a Catalina Real-Time Transient Survey discovery of a supernova in a faint anonymous galaxy in Catalina Sky Survey unfiltered images on January 13.19 UT at magnitude 15.1.

Coordinates: 04:45:30.38  -07:20:52.7  (J2000.0)

Offset: 2" South of the galaxy center

After posting on the CBAT Transient Object Confirmation Page [1], the discovery was confirmed by R. A. Koff, Antelope Hills Obseratory, Colorado, whose CCD images taken around January 14.069 UT showed an object at magnitude 15.1.

Low-resolution spectroscopy by K. Ayani, Bisei Astronomical Observatory, and H. Yamaoka, Kyushi University, show that SN 2011K is a type-Ia supernova several days before maximum.

Finder charts for SN 2011K (AUID 000-BJY-013) may be created entering the coordinates into the Variable Star Plotter (VSP) [2].

Please submit observations to the AAVSO International Database using the name SN 2011K.

This Special Notice was compiled by Elizabeth O. Waagen.

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