NGC 1084

NGC 1084 is an unbarred spiral galaxy in the constellation Eridanus. It is located at a distance of about 63 million light-years away from the Milky Way. The galaxy was discovered by William Herschel on 10 January 1785. It has multiple spiral arms, which are not well defined.^[6] It belongs in the same galaxy group with NGC 988, NGC 991, NGC 1022, NGC 1035, NGC 1042, NGC 1047, NGC 1052 and NGC 1110. This group is in turn associated with the Messier 77 group.^[7]

NGC 1084
NGC 1084 imaged by the Hubble Space Telescope in 2001
Observation data (J2000 epoch)
Constellation	Eridanus
Right ascension	02h 45m 59.926s[1]
Declination	−07° 34′ 43.10″[1]
Redshift	1,406 km/s[2]
Distance	62.7 Mly (19.23 Mpc)[2]
Apparent magnitude (V)	10.7
Characteristics
Type	SAc[3][4]
Apparent size (V)	3.2′ × 1.8′[3]
Other designations
LEDA 10464, MCG-01-08-007[5] PGC 10464[3]

Star formation in the galaxy is chaotic and not confined to the spiral arms, but the rate is not high enough to classify it as a starburst galaxy. Star formation has taken place in small bursts in the last 40 million years. The cause of this activity has been proposed as a merger with a gas-rich dwarf galaxy. A radio source has been detected 3.5' south-west of the galaxy, connected to it by a bridge.^[8]

Supernovae

Five supernovae have been observed in NGC 1084:^[9][10]

• SN 1963P (type Ia, mag. 14.5) was discovered by Paul Wild on 18 September 1963.^[11][12]
• SN 1996an (type II, mag. 14) was discovered by Masakatsu Aoki on 27 July 1996.^[13][14]
• SN 1998dl (Type II, mag. 16) was discovered by the Lick Observatory Supernova Search (LOSS) on 20 August 1998.^[15][16]
• SN 2009H (Type II, mag. 17.4) was discovered by the Lick Observatory Supernova Search (LOSS) on 2 January 2009.^[17][18]
• SN 2012ec (Type IIP, mag. 14.5) was discovered by Berto Monard on 11 August 2012.^[19][20]

Gallery

• 
  GALEX
• 
  NGC 1084 by 2MASS
• 
  SDSS
• 
  NGC 1084 by the Hubble Space Telescope
• 
  Hubble Space Telescope image of NGC 1084.
• 
  The galaxy as imaged by the Legacy surveys, showing the tidal structures of NGC 1084