NGC 739

NGC 739
NGC 739 (SDSS)
Observation data (J2000.0 epoch)
Constellation	Triangulum
Right ascension	01h 56m 54.70s [1]
Declination	+33° 16′ 00.00″ [1]
Redshift	0.015104 [1]
Heliocentric radial velocity	4528 ± 34 km/s [1]
Distance	193 Mly
Apparent magnitude (V)	14.10 [2]
Apparent magnitude (B)	15.00 [2]
Characteristics
Type	S0-a [2]
Apparent size (V)	0.9 x 0.6 [2]
Other designations
PGC 7312, MCG +05-05-030

NGC 739 is a spiral galaxy approximately 193 million light-years away from Earth in the constellation of Triangulum.^[1][3]

NGC 739 was discovered by English astronomer Ralph Copeland on January 9, 1874.^[4] He was using the 72" telescope at Birr Castle in an observation of Arp 166, which is composed of two interacting galaxies NGC 750 and NGC 751.^[4][5] Copeland reported the wrong direction of the newly observed galaxy, but gave the correct orientation as PA 292° (WNW) and separation 524" (8.7').^[4] Because of his error the derived position was in error and this was copied into the NGC Catalogue.^[4]

In 1913 American astronomer Heber Curtis noted there was nothing at that position and suggested MCG +05-05-030 was in fact NGC 739, based on Edward Crossley's photographs taken at Lick Observatory.^[4]

• Spiral galaxy
• List of NGC objects (1–1000)
• Triangulum (constellation)

Wikimedia Commons has media related to NGC 739.

• NGC 739 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
• SEDS