NGC 663

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Open star cluster
NGC 663
NGC663HunterWilson.jpg
NGC 663
AladinLite
Constellation Cassiopeia
Position
equinox : J2000.0
Right ascension 01 h 46 m 16.0 s
declination + 61 ° 13 ′ 05 ″
Appearance

classification III 2 m
Brightness  (visual) +7.1 mag
Angular expansion 15 '
Number of stars about 80
Brightest star +8.4 mag
Physical data

Affiliation Milky Way ,
Cas OB8
distance  approx. 6400 ly
(1952 pc )
history
Discovered by William Herschel
Discovery time November 3, 1787
Catalog names
 NGC  663 • C 0142 + 610 • OCl 333 •  Mel  11 •  Cr  20 • Lund 55 •  GC  392 •  H  VII 31 •

NGC 663 is an open star cluster in the constellation Cassiopeia . NGC 663 is 15 'in diameter and has an apparent magnitude of 7.1 mag. NGC 663 is a relatively young star cluster and contains numerous Be stars. The distance to the sun is about 6500 light years, its age is estimated to be about 20 million years.
NGC 663 is part of the OB association Cassiopeia OB8, which includes NGC 654 and Messier 103 , among others . NGC 663 is considered to be the most massive star cluster and core of Cassiopeia OB8. The double star Struve 152 is a member of the star cluster.

NGC 663 was discovered on November 3, 1787 by the German-British astronomer Friedrich Wilhelm Herschel .

Web links

Individual evidence

  1. ↑ NASA / IPAC EXTRAGALACTIC DATABASE
  2. ↑ a b c NGC 663
  3. ↑ WEBDA
  4. ↑ SuW 10.2016 p. 51
  5. ↑ Seligman