NGC 4609

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Open star cluster
NGC 4609
NGC 4609 large.png
AladinLite
Constellation southern Cross
Position
equinox : J2000.0
Right ascension 12 h 42 m 16.8 s
declination -62 ° 59 ′ 45 ″
Appearance

classification II1p
Brightness  (visual) 6.9 likes
Angular expansion 6.0 '
Redness ( excess color  E (BV)) 0.37 ± 0.03
Physical data

Affiliation Milky Way
Radial velocity −21.3 ± 0.1 km / s
distance  approx. 4000 ly
(1223 pc )
Age approx. 50 million years
history
Discovered by James Dunlop
Discovery time May 12, 1826
Catalog names
 NGC  4609 • C 1239-627 • OCl 890 •  Cr  263 •  Dun  272 • Lund 625 •  ESO  95-SC14 •  GC  3145 •  h  3407 •

NGC 4609 is a galactic open star cluster in the south of the constellation Crux , near the center of the Coalsack . The distance from NGC 4609 is estimated to be around 1300 parsecs. The cluster was discovered by the Scottish astronomer James Dunlop on May 12, 1826 .

literature

Web links

Individual evidence

  1. NASA / IPAC EXTRAGALACTIC DATABASE
  2. a b c SEDS : NGC 4609
  3. WEBDA page on NGC 4609
  4. Seligman