| NGC 918 | |
|---|---|
NGC 918 by the Mount Lemmon SkyCenter
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| Observation data (J2000 epoch) | |
| Constellation | Aries |
| Right ascension | 02h25m50s[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]
Media related to NGC 918 at Wikimedia Commons|
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