NGC 2115
NGC 2115 (center) with PGC 18002 (below and to left of center) imaged by Legacy Surveys
Observation data (J2000 epoch)
Constellation	Pictor
Right ascension	05h 51m 19.8104s[1]
Declination	−50° 34′ 58.304″[1]
Redshift	0.023389±0.0000730[1]
Heliocentric radial velocity	7,012±22 km/s[1]
Distance	340.9 ± 23.9 Mly (104.52 ± 7.33 Mpc)[1]
Apparent magnitude (V)	14.15[1]
Characteristics
Type	S0+? pec[1]
Size	~229,500 ly (70.35 kpc) (estimated)[1]
Apparent size (V)	1.1′ × 0.5′[1]
Other designations
ESO 205- G 006 NED01, 2MASX J05511983-5034582, PGC 18001[1]

NGC 2115 is a large lenticular galaxy in the constellation of Pictor. Its velocity with respect to the cosmic microwave background is 7,087±23 km/s, which corresponds to a Hubble distance of 340.9 ± 23.9 Mly (104.52 ± 7.33 Mpc).^[1] It was discovered by British astronomer John Herschel on 4 January 1837.^[2]

Pair of interacting galaxies

The apparent magnitude of PGC 18002, the galaxy further south, is 15.1 and was certainly not observed by Herschel.^[2] The radial velocities of these two galaxies are almost equal, so they are at the same distance from us and, judging by their shape, they are in gravitational interaction.^[2]

Identification

In the NASA/IPAC Extragalactic Database, NGC 2115 appears as a pair of galaxies. To view the data for NGC 2115, it must be identified as NGC 2115A or PGC 18001.^[1] The other galaxy in the pair is identified in this database as NGC 2115B, which is PGC 18002.^[3] [Note: This can cause confusion, as other databases, such as SIMBAD, identify PGC 18002 as NGC 2115A.]^[4]

Supernova

One supernova has been observed in NGC 2115:

• SN 2021clw (Type Ia, mag. 16.7) was discovered by ASAS-SN on 10 February 2021.^[5]

See also

• List of NGC objects (2001–3000)

References

External links

• Media related to NGC 2115 at Wikimedia Commons
• NGC 2115 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images