Gacrux

Gam Cru

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Gacrux glows a distinct red, its B–V colour index of 1.6 among the highest of the bright stars and the visual mark of an M-type classification. Designated Gamma Crucis, it forms the top of the Southern Cross in the constellation Crux and, at 88.6 light-years, is the nearest red star of first magnitude. It appears at magnitude 1.59, and its absolute magnitude of −0.58 shows an intrinsic brightness above the Sun's. From a southern declination of −57° Gacrux stays below the horizon for most northern observers. Its warm colour contrasts sharply with the blue-white glow of the Cross's other members.

คุณสมบัติทางกายภาพ

ประเภทสเปกตรัม M Class M — M-type (Red)
ดัชนีสี (B−V) 1.600

การสังเกต

โชติมาตรปรากฏ +1.59
โชติมาตรสัมบูรณ์ -0.58
ระยะทาง 88.6 ly
กลุ่มดาว Crux

ตำแหน่ง

ไรต์แอสเซนชัน 12h 31.17m
เดคลิเนชัน -57° 6.79′

Frequently Asked Questions

What type of star is Gacrux?
Gacrux is a Class M — M-type (Red) star.
How far is Gacrux from Earth?
Gacrux is approximately 88.6 light-years from Earth.
Can you see Gacrux with the naked eye?
With an apparent magnitude of 1.59, Gacrux is visible to the naked eye.
What constellation is Gacrux in?
Gacrux is located in the constellation Crux.