IC 5145

IC 5145 is a type Sab spiral galaxy located in the constellation Pegasus. It is located 356 million light-years from the Solar System and was discovered by Edward Emerson Barnard, although the year he discovered it is unknown.

The luminosity class of IC 5145 is I-II and it has a broad H II region. Its dimensions measure 1.60 x 0.9 arcmin.

Supernovae
Five supernovae have been discovered in IC 5145 so far: SN 2002dn, SN 2003hy, SN 2010iq, PSN J21542359+1509224 and SN 2022lfa.

SN 2002dn

SN 2002dn was discovered in IC 5145 by astronomer W. D. Li from University of California at Berkeley via unfiltered KAIT CCD images taken on June 15 and June 17, 2002. It was located 8".8 west and 18".3 north of the nucleus. A further inspection done by A. V. Filippenko, R. Chornock and R. J. Foley, using the Shane 3-m reflector at Lick Observatory confirmed SN 2002dn was a Type Ic supernova which resembled SN 1987m.

SN 2003hy

SN 2003hy was discovered by British amateur astronomer, Tom Boles from Coddenham, England on September 14, through unfiltered CCD images using a 0.35-m reflector as part of the course done by U.K. Nova/Supernova Patrol. Surprising, SN 2003hy was also discovered by another amateur astronomer, Mark Armstrong who saw it on the same unfiltered CCD images and via a 0.35m reflector. It had a magnitude of 16.6 and was located 5".5 west and 12".5 north of the nucleus. The supernova was Type IIn.

A 14-minute exposure of SN 2003hy taken on December 28, 2003, shows it is much dimmer than 19.4 magnitude, which the dimmest stars are magnitude 20.

SN 2010iq

Lick Observatory Supernova Search discovered SN 2010iq on October 11, 2010. It was reported by A. Narla, S. B. Cenko, W. Li and A. V. Filippenko from University of California, Berkeley through unfiltered CCD images. It was located 2".8 east and 4".4 south of the nucleus with a magnitude of 18.2. This supernova was Type Ic.

PSN J21542359+1509224

PSN J21542359+1509224 was discovered on 13 May 2014 by Bin Wang and Xing Gao. It was located 5".3 east and 0".9 south of the nucleus with a magnitude of 18.3. This supernova had an unknown type.

SN 2022lfa

SN 2022lfa was discovered on May 28, 2022, by Zwicky Transient Facility (ZTF) through Palomar 1.2m Oschin telescope on the behalf of K. De from Caltech. On June 28, 2022, astronomers confirmed that SN 2022lfa is a Type Ic supernova via a spectrum obtained on MJD 59755.43 using the 3-m Shane telescope at Lick Observatory.