Blanco 1 contains approximately 300 stars, around 170 of these being brighter thanmagnitude +12,[3] the brightest of which is HD 225187, a 7th-magnitude B8V star. It has a cross-sectional magnitudal density of about 30 per square parsec: less than half that of thePleiades cluster. Of the confirmed members, eight have been found to radiate anexcess of infrared energy, indicating that they host orbitingdebris disks.[4] Roughly half the stars in the cluster are members ofbinary star systems; six of the member stars are confirmedspectroscopic binaries.[5] A system known as NGTS J0002-29 is a triple system that contains one of only a few well-characterisedeclipsing binaries with twored dwarfs: they orbit each other with a period of 1.098 days.[6] There are also some 30–40brown dwarf members.[1]
^Smith, Gareth D.; Gillen, Edward; Queloz, Didier; Hillenbrand, Lynne A.; Acton, Jack S.; Alves, Douglas R.; Anderson, David R.; Bayliss, Daniel; Briegal, Joshua T.; Burleigh, Matthew R.; Casewell, Sarah L.; Delrez, Laetitia; Dransfield, Georgina; Ducrot, Elsa; Gill, Samuel; Gillon, Michaël; Goad, Michael R.; Günther, Maximilian N.; Henderson, Beth A.; Jenkins, James S.; Jehin, Emmanuël; Moyano, Maximiliano; Murray, Catriona A.; Pedersen, Peter P.; Sebastian, Daniel; Thompson, Samantha; Tilbrook, Rosanna H.; Triaud, Amaury H M J.; Vines, Jose I.; Wheatley, Peter J. (2021)."NGTS clusters survey – III. A low-mass eclipsing binary in the Blanco 1 open cluster spanning the fully convective boundary".Monthly Notices of the Royal Astronomical Society.507 (4):5991–6011.arXiv:2109.00836.doi:10.1093/mnras/stab2374.
