NGC 4375

NGC 4375 is a barred spiral galaxy in the constellation of Coma Berenices. Its velocity with respect to the cosmic microwave background is 9325 ± 20 km/s, which corresponds to a Hubble distance of 137.54 ± 9.63 Mpc (~448 million light-years).^[1] However, four non-redshift measurements give a closer distance of 105.5 Mpc (~344 million light-years).^[2] The galaxy was discovered by German-British astronomer William Herschel on 11 April 1785.^[3]

NGC 4375
NGC 4375 imaged by SDSS
Observation data (J2000 epoch)
Constellation	Coma Berenices
Right ascension	12h 25m 00.4734s[1]
Declination	+28° 33′ 30.952″[1]
Redshift	0.030153 [1]
Heliocentric radial velocity	9040 ± 3 km/s[1]
Distance	448.6 ± 31.4 Mly (137.54 ± 9.63 Mpc)[1]
Apparent magnitude (V)	12.6[1]
Characteristics
Type	SB(r)ab pec?[1]
Size	~148,000 ly (45.37 kpc) (estimated)[1]
Apparent size (V)	1.4′ × 1.2′[1]
Other designations
IRAS 12224+2850, 2MASX J12250049+2833306, UGC 7496, MCG +05-29-080, PGC 40449, CGCG 158-100[1]

The SIMBAD database lists NGC 4375 as a Seyfert II Galaxy, i.e. it has a quasar-like nuclei with very high surface brightnesses whose spectra reveal strong, high-ionisation emission lines, but unlike quasars, the host galaxy is clearly detectable.^[4]

Supernovae

Two supernovae have been observed in NGC 4375:

• SN 1960J (type unknown, mag. 18.5) was discovered by Milton Humason on 18 June 1960.^[5][6]
• SN 2023vsr (Type II, mag. 17.6478) was discovered by the Zwicky Transient Facility on 24 October 2023.^[7]

See also

• List of NGC objects (4001–5000)