IC 5145
SDSS image of IC 5145
Observation data
Constellation	Pegasus
Right ascension	21h 54m 23.06s
Declination	+15d 09m24.6s
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

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]

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

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 ^[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 2022lfa

SN 2022lfa ^[17] 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. ^[18] 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. ^[19]

References