Blanco 1

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Blanco 1
Observation data (J2000 epoch)
Constellation Sculptor
Right ascension 00h 04m 24s[1]
Declination –29° 56.4′[1]
Distance 850+160
Physical characteristics
Estimated age 100–150[1] Myr
See also: Open cluster, List of open clusters

Blanco 1 is a nearby open cluster of stars located around 850 light years away from the Sun in the southern constellation of Sculptor. It was discovered by Puerto Rican astronomer Víctor Manuel Blanco in 1949,[1] who noticed an unusually high proportion of A-type stars in an area spanning 1.5°.[2] This cluster is relatively young, with an age of about 100–150 million years. It is positioned at a high galactic latitude of b = –79.3° and is located some 780 ly (240 pc) below the galactic plane.

Blanco 1 contains approximately 300 stars, around 170 of these being brighter than magnitude +12,[3] and it has a cross-sectional magnitudal density of about 30 per square parsec: less than half that of the Pleiades cluster. Of the confirmed members, eight have been found to radiate an excess of infrared energy, indicating that they host orbiting debris disks.[4] Roughly half the stars in the cluster are members of binary star systems; six of the member stars are confirmed spectroscopic binaries.[5] There are also some 30–40 brown dwarf members.[1]


  1. ^ a b c d e f Moraux, E.; et al. (August 2007), "The lower mass function of the young open cluster Blanco 1: from 30 MJup to 3 M", Astronomy and Astrophysics, 471 (2): 499–513, arXiv:0706.2102Freely accessible, Bibcode:2007A&A...471..499M, doi:10.1051/0004-6361:20066308. 
  2. ^ Blanco, Victor M. (August 1949), "A New Galactic Star Cluster in Sculptor", Publications of the Astronomical Society of the Pacific, 61 (361): 183, Bibcode:1949PASP...61..183B, doi:10.1086/126171. 
  3. ^ Bagnall, Philip M. (2012), The Star Atlas Companion: What You Need to Know about the Constellations, Springer, p. 409, ISBN 146140830X. 
  4. ^ Stauffer, John R.; et al. (August 1949), "Debris Disks of Members of the Blanco 1 Open Cluster", The Astrophysical Journal, 719 (2): 1859–1871, arXiv:1007.0239Freely accessible, Bibcode:2010ApJ...719.1859S, doi:10.1088/0004-637X/719/2/1859. 
  5. ^ González, J. F.; Levato, H. (November 2009), "Spectroscopic study of the open cluster Blanco 1", Astronomy and Astrophysics, 507 (1): 541–547, Bibcode:2009A&A...507..541G, doi:10.1051/0004-6361/200912772.