IC 3505

IC 3505 is a barred spiral galaxy^[1] located 640 million light-years^[2] away from the Solar System in the Coma Berenices constellation.^[3] With an apparent size of 0.95 by 0.35 arcmin, IC 3505 has an estimated diameter of 170,000 light-years, making it slightly larger compared to the Milky Way.^[2] It is categorized as a LINER galaxy^[4] with an active galactic nucleus^[5] emitting weak emission-lines.^[6]

IC 3505
IC 3505 captured by Sloan Digital Sky Survey
Observation data (J2000 epoch)
Constellation	Coma Berenices
Right ascension	12h 34m 10.31s
Declination	+15° 58′ 05.60″
Redshift	0.046090
Heliocentric radial velocity	13,843 km/s
Distance	645 Mly (197.8 Mpc)
Apparent magnitude (V)	12.412
Characteristics
Type	SBc
Size	170,000 ly
Apparent size (V)	1.01' x 0.41'
Other designations
IRAS 12316+1614, MCG+03-032-070, PGC 41792, 2MASX J12341031+1558058, VCC 1542, GASS 30439, ALFAFFA 1-349, AGC 220790, NVSS J123410+155803, LEDA 41792

IC 3505 was discovered by Royal Harwood Frost on May 7, 1904.^[7] According to Frost when he saw the object for the first time, he listed it as a type SBc at right ascension "12 34 10.3" and declination "+15 58 07".^[7] Despite being listed in the Virgo Cluster catalogue as VCC 1542, it is not part of the Virgo Cluster but a background galaxy.^[8]

Two supernovae have been discovered in IC 3505. SN 2019iaz (Type Ia, mag: 19.6) was discovered on June 21, 2019, by C. Fremling from Caltech on behalf on Zwicky Transient Facility (ZTF)^[9] and AT 2023gpz (unknown, mag: 20.2) which was discovered by K. De (also from ZTF) on April 21, 2023.^[10]