NGC 1684

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Galaxy
NGC 1684
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NGC 1684 & NGC 1682 [1]
NGC 1684 & NGC 1682
AladinLite
Constellation Orion
Position
equinox :  J2000.0 , epoch : J2000.0
Right ascension 04 h 52 m 31.150 s
declination -03 ° 06 ′ 21.80 ″
Appearance
Morphological type E + / pec:  
Brightness  (visual) 12.0 mag
Brightness  (B-band) 13.0 likes
Angular expansion 2.2 ′ × 1.7 ′
Position angle 93 °
Surface brightness 13.5 mag / arcmin²
Physical data
Redshift 0.014764 ± 0.000057  
Radial velocity 4426 ± 17 km / s  
Stroke distance
v rad  / H 0 		(194 ± 14)  ·  10 6  ly
(59.5 ± 4.2)  Mpc 
history
discovery William Herschel
Discovery date February 1, 1786
Catalog names
NGC  1684 • PGC  16219 • MCG  -01-13-031 • IRAS  04500-0311 • 2MASX  J04523116-0306220 • GC  920, GC 921, GC 924 • H  II 528 • h  334 • LDCE 351 NED012 • NVSS J045231-030622 • WISEA J045231.09-030621.6

NGC 1684 is an elliptical galaxy from the Hubble-type E2 in the constellation Orion the celestial equator . It is estimated to be 194 million light years from the Milky Way and about 125,000 light years in diameter . Presumably it forms a gravitationally bound galaxy pair together with NGC 1682 .

In the same area of ​​the sky are u. a. the galaxies NGC 1670 , NGC 1678 , NGC 1683 , NGC 1685 .

The object was discovered on February 1, 1786 by the astronomer William Herschel with an 18.7-inch telescope .

Web links

Individual evidence

  1. ^ Aladin Lite
  2. ↑ a b c d NASA / IPAC EXTRAGALACTIC DATABASE
  3. ↑ a b c d e f SEDS : NGC 1684
  4. ↑ Seligman