Zeta2 Scorpii (Zeta2 Sco, ζ2 Scorpii, ζ2 Sco) is a
K-type orange
giantstar in the
constellation of
Scorpius.[8] It has an
apparent visual magnitude which varies between 3.59 and 3.65,[2] and is located near the blue-white supergiant star
ζ1 Scorpii in Earth's sky. In astronomical terms, ζ2 is much closer to the Sun and unrelated to ζ1 except for line-of sight co-incidence. ζ1 is about 6,000 light-years away and probably an outlying member of
open star clusterNGC 6231 (also known as the "northern jewel box" cluster), whereas ζ2 is a mere 135 light-years distant and thus much less luminous in real terms. ζ2 can also be distinguished from its optical partner, ζ1, because of its orangish colour especially in long-exposure
astrophotographs.
^Landi Dessy, J.; Keenan, P. C. (November 1966), "Spectral Types on the MK System for Forty-Three Bright Southern Stars, K2-M6", Astrophysical Journal, 146: 587,
Bibcode:
1966ApJ...146..587L,
doi:10.1086/148925.
^
abcHR 6271, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr.,
CDS ID
V/50. Accessed on line November 20, 2009.
^Evans, D. S. (June 20–24, 1966), Batten, Alan Henry; Heard, John Frederick (eds.), "The Revision of the General Catalogue of Radial Velocities", Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30, vol. 30, University of Toronto:
International Astronomical Union, p. 57,
Bibcode:
1967IAUS...30...57E.
^Jofré, E.; Petrucci, R.; Saffe, C.; Saker, L.; de la Villarmois, E. Artur; Chavero, C.; Gómez, M.; Mauas, P. J. D. (2015), "Stellar parameters and chemical abundances of 223 evolved stars with and without planets", Astronomy & Astrophysics, 574: A50,
arXiv:1410.6422,
Bibcode:
2015A&A...574A..50J,
doi:
10.1051/0004-6361/201424474,
S2CID53666931, A50.