NGC 918

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]

NGC 918
NGC 918 by the Mount Lemmon SkyCenter
Observation data (J2000 epoch)
Constellation	Aries
Right ascension	02h 25m 50.7648s[1]
Declination	+18° 29′ 46.987″[1]
Redshift	0.005037[1]
Heliocentric radial velocity	1510 ± 1 km/s[1]
Distance	20.6±1.5 mpc [2]
Apparent magnitude (V)	15.01[3]
Apparent magnitude (B)	16.0[3]
Characteristics
Type	SAB(rs)c[1]
Size	~70,500 ly (21.63 kpc) (estimated)[1]
Apparent size (V)	3.5′ × 2.0′[1]
Other designations
IRAS 02230+1816, UGC 1888, MCG +03-07-011, PGC 9236, CGCG 462-011[3][1]

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 which 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.^[2]

Supernovae

Two supernovae have been observed in NGC 918:

• SN 2009js (type II, mag. 17.2) was discovered by Kōichi Itagaki and independently by the Lick Observatory Supernova Search (LOSS) on October 11, 2009.^{[7][8][9][10][11]} This was the first subluminous supernova to be studied in infrared wavelengths.^[10]
• SN 2011ek (type Ia, mag. 16.4) was discovered by Kōichi Itagaki on Aug. 4, 2011.^[12][13][14]

NGC 918 and dust clouds within our Milky Way with the 10th data release of the Legacy Survey.

See also

• List of NGC objects (1–1000)