Blanco 1
Blanco 1 is a nearby open cluster of stars located around 850 light years away from the Sun in the southern constellation of Sculptor near the star ζ Sculptoris. It was discovered by Puerto Rican astronomer Víctor Manuel Blanco in 1949, who noticed an unusually high proportion of A-type stars in an area spanning 1.5°. 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 below the galactic plane.
Blanco 1 contains approximately 300 stars, around 170 of these being brighter than magnitude +12, 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. Roughly half the stars in the cluster are members of binary star systems; six of the member stars are confirmed spectroscopic binaries. There are also some 30–40 brown dwarf members.
