Kappa Scorpii

Starbox begin
name=Kappa Scorpii Starbox observe
epoch=J2000
ra=17^h 42^m 29.3^s
dec=-39° 01′ 48″
appmag_v=2.39
constell=Scorpius Starbox character
class=B1.5 III
b-v=-0.22
u-b=-0.89
variable=β Cephei Starbox astrometry
radial_v=-14
prop_mo_ra=-6.49
prop_mo_dec=-25.55
parallax=7.03
p_error=0.73
absmag_v=-3.38 Starbox catalog
names=Girtab, HR 6580, CD -38°12137, HD 160578, SAO 209163, FK5 660, CPD P-38 6992, HIP 86670.

Kappa Scorpii (κ Sco / κ Scorpii) is a star in the constellation Scorpius. It also has the traditional name Girtab.

The name Girtab is actually (or perhaps originally) applied to an asterism comprising this star, Lambda Scorpii, Upsilon Scorpii, and Iota Scorpii.

This star is a spectroscopic binary, and the primary is also a Beta Cephei variable-type pulsating star. Spectroscopic measurements have given an orbital period of 195 days. The pulsations have a primary component of 4.80 hours and a secondary period of 4.93 hours.

References

* K. Uytterhoeven "et al", 2005, "Disentangling component spectra of kappa Scorpii, a spectroscopic binary with a pulsating primary," "Astronomy and Astrophysics", Volume 432, Issue 3.