NGC 918 | |
---|---|
![]() NGC 918 by the
Mount Lemmon SkyCenter | |
Observation data ( J2000 epoch) | |
Constellation | Aries |
Right ascension | 02h 25m 50s [1] |
Declination | +18° 29′ 46″ [1] |
Redshift | 0.005027 [2] |
Heliocentric radial velocity | 1507 ± 3 km/s [2] |
Distance | 20.6±1.5 mpc [3] |
Apparent magnitude (V) | 15.01 [1] |
Apparent magnitude (B) | 16.0 [1] |
Characteristics | |
Type | SAB(rs)c [2] |
Other designations | |
NGC 918, MCG+03-07-011, LEDA 9236 [1] |
NGC 918 is a barred spiral galaxy in the constellation Aries, about 67 million light years from the Milky Way. It was discovered by John Herschel on Jan 11, 1831. [4]
The brightness class of NGC 918 is III and it has a broad line of neutral hydrogen. NGC 918 is also an active nucleus galaxy (AGN). Moreover, it is a field galaxy; that is to say, it does not belong to a cluster or group and is therefore gravitationally isolated. [5]
Many non-redshift measures give a distance of 19,115 ± 6,160 Mpc (~62,3 million ly), [6] which is within the distances calculated using the value shift. [3]
Two supernovae have been observed in this galaxy. SN 2009js ( type II, mag. 17.2) was discovered on October 11, 2009. [5] [7] [8] [9] This was the first subluminous supernova to be studied in infrared wavelengths. [10] Supernova SN 2011ek ( type Ia, mag. 16.4) was discovered on Aug. 4, 2011 by Kōichi Itagaki. [11] [12]
NGC 918 | |
---|---|
![]() NGC 918 by the
Mount Lemmon SkyCenter | |
Observation data ( J2000 epoch) | |
Constellation | Aries |
Right ascension | 02h 25m 50s [1] |
Declination | +18° 29′ 46″ [1] |
Redshift | 0.005027 [2] |
Heliocentric radial velocity | 1507 ± 3 km/s [2] |
Distance | 20.6±1.5 mpc [3] |
Apparent magnitude (V) | 15.01 [1] |
Apparent magnitude (B) | 16.0 [1] |
Characteristics | |
Type | SAB(rs)c [2] |
Other designations | |
NGC 918, MCG+03-07-011, LEDA 9236 [1] |
NGC 918 is a barred spiral galaxy in the constellation Aries, about 67 million light years from the Milky Way. It was discovered by John Herschel on Jan 11, 1831. [4]
The brightness class of NGC 918 is III and it has a broad line of neutral hydrogen. NGC 918 is also an active nucleus galaxy (AGN). Moreover, it is a field galaxy; that is to say, it does not belong to a cluster or group and is therefore gravitationally isolated. [5]
Many non-redshift measures give a distance of 19,115 ± 6,160 Mpc (~62,3 million ly), [6] which is within the distances calculated using the value shift. [3]
Two supernovae have been observed in this galaxy. SN 2009js ( type II, mag. 17.2) was discovered on October 11, 2009. [5] [7] [8] [9] This was the first subluminous supernova to be studied in infrared wavelengths. [10] Supernova SN 2011ek ( type Ia, mag. 16.4) was discovered on Aug. 4, 2011 by Kōichi Itagaki. [11] [12]