IC 5145

IC 5145 is a type Sab spiral galaxy^[1] located in the constellation Pegasus.^[2][3] It is located 356 million light-years from the Solar System^[4] and was discovered by Edward Emerson Barnard, although the year he discovered it is unknown.^[5]

IC 5145
SDSS image of IC 5145
Observation data (J2000 epoch)
Constellation	Pegasus
Right ascension	21h 54m 23.06s
Declination	+15° 09′ 24.6″
Redshift	0.024594
Heliocentric radial velocity	7,373 km/s
Distance	356 Mly (109.2 Mpc)
Apparent magnitude (V)	14.30
Surface brightness	13.8 arcmin
Characteristics
Type	Sab
Size	1.6 x 0.9 arcmin
Other designations
UGC 11844, CGCG 427-041, PGC 67619, NSA 149423, WBL 674-003, MCG +02-55-028, 2MASX J21542304+1509244, 2MASS J21542306+1509249, SDSS J215423.07+150924.9, LEDA 67619

The luminosity class of IC 5145 is I-II and it has a broad H II region.^[4] Its dimensions measure 1.60 x 0.9 arcmin.^[6]

Supernovae

Six supernovae have been discovered in IC 5145 so far: SN 2002dn, SN 2003hy, SN 2010iq, PSN J21542359+1509224, SN 2020pkj, and SN 2022lfa.

SN 2002dn

SN 2002dn^[7] 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.^[8] It was located 8".8 west and 18".3 north of the nucleus.^[9] 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.^[8][7]

SN 2003hy

SN 2003hy^[10] 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.^[11] 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.^[11] It had a magnitude of 16.6^[10] and was located 5".5 west and 12".5 north of the nucleus.^[12] The supernova was Type IIn.^[10]

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.^[13]

SN 2010iq

Lick Observatory Supernova Search discovered SN 2010iq on October 11, 2010.^[14] It was reported by A. Narla, S. B. Cenko, W. Li and A. V. Filippenko from University of California, Berkeley through unfiltered CCD images.^[15] It was located 2".8 east and 4".4 south of the nucleus with a magnitude of 18.2.^[14] This supernova was Type Ic.^[14]

PSN J21542359+1509224

PSN J21542359+1509224 was discovered on 13 May 2014 by Bin Wang and Xing Gao.^[16] 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.^[16]

SN 2020pkj

SN 2020pkj (type Ia, mag. 19.2) was discovered on 15 July 2020 by ZTF.^[17]

SN 2022lfa

SN 2022lfa^[18] 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.^[19] 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.^[20]