Herschel's jewelry box

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Open star cluster
Herschel's jewelry box
A Snapshot of the Jewel Box cluster with the ESO VLT.jpg
The open star cluster NGC 4755 imaged by the VLT
AladinLite
Constellation southern Cross
Position
equinox : J2000.0
Right ascension 12 h 53 m 37.1 s
declination -60 ° 21 ′ 23 ″
Appearance

classification I3r
Brightness  (visual) 4.2 likes
Angular expansion 10 '
Physical data

Affiliation Milky Way
Redshift (42 ± 11)  ·  10 −6
Radial velocity (−12.5 ± 3.21) km / s
distance  (6800 ± 700) ly
((2100 ± 200) pc )
history
Discovered by Nicolas Louis de Lacaille
Discovery time 1751
Catalog names
 NGC  4755 • C 1250-600 • OCl 892 •  Mel  114 •  Cr  264 •  Dun  301 • Lund 627 •  ESO  131-SC16 •  GC  3275 •

NGC 4755 , also known as the jewel box ( so named by John Herschel in 1830) or the Kappa Crucis Cluster , is an open star cluster in the Southern Cross and one of the most prominent star clusters in the southern sky .

NGC  4755 is 10 ′ in diameter, has an apparent magnitude of 4.2 m, and is approximately 6,800 light years from Earth. The stars of the star cluster have different masses from about half to 20 times the mass of the Sun, but all have the same chemical composition and were formed from the same gas and dust cloud about 16 million years ago.

Position of the “jewelry box” in the Southern Cross constellation
The "jewel box" in a recording of the La Silla Observatory of ESO

Web links

Commons : NGC 4755  - Collection of Images, Videos, and Audio Files

Individual evidence

  1. ↑ G. Lyngå: Catalog of Open Cluster Data
  2. ↑ a b NGC 2000.0 . VizieR catalog; Sky Publishing, ed. Sinnott 1988
  3. ↑ NASA / IPAC EXTRAGALACTIC DATABASE
  4. ↑ SIMBAD database
  5. ^ Sanner et al .: Photometric and kinematic studies of open star clusters III. NGC 4103, NGC 5281 and NGC 4755 . In: Astronomy and Astrophysics Volume 369, 2001, pp. 511 ff. Bibcode : 2001A & A ... 369..511S
  6. ↑ Seligman
  7. ↑ Janine Fohlmeister: The Cosmic Jewelry Store NGC 4755 . In: Stars and Space , No. 1/2010, pp. 18–19.