G Scorpii

G Scorpii

Template:Location mark Location of G Scorpii (circled)
Observation data Epoch J2000      Equinox J2000
Constellation	Scorpius
Right ascension	Template:RA
Declination	Template:DEC
Apparent magnitude (V)	3.21
Characteristics
Evolutionary stage	horizontal branch
Spectral type	K2 III
U−B Template:Engvar	+1.19
B−V Template:Engvar	+1.17
Astrometry
Radial velocity (Rv)	+24.7 km/s
Proper motion (μ)	RA: +40.59 mas/yr Dec.: +27.24 mas/yr
Parallax (π)	25.92±0.15 mas
Distance	Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)	+0.24
Details
Mass	Template:Val Template:Solar mass
Radius	16.4 Template:Solar radius
Luminosity	Template:Val Template:Solar luminosity
Surface gravity (log g)	2.2 cgs
Temperature	Template:Val K
Metallicity [Fe/H]	Template:Val dex
Rotational velocity (v sin i)	<1.0 km/s
Metallicity [Fe/H]	{{{metal_fe2}}} dex
Other designations
Template:Odlist
Database references
SIMBAD	data

G Scorpii (abbreviated G Sco), also named Fuyue, is a giant star in the constellation of Scorpius. It has an apparent magnitude of +3.19. It is approximately 126 light-years from the Sun.

Nomenclature

File:NGC 6441 HST 10775 R814B606.png

G Scorpii below and right (ie. west) of NGC 6441

G Scorpii is the star's Bayer designation. It was formerly situated in the constellation of Telescopium where it was designated γ Telescopii, Latinised to Gamma Telescopii. It was resited in Scorpius and redesignated G Scorpii by Benjamin Apthorp Gould.

G Scorpii bore the traditional name Fuyue (Template:Zh) in ancient China. Fu Yue was a former slave that became a high-ranking minister to Shang dynasty ruler Wu Ding. In 2016, the IAU organized a Working Group on Star Names (WGSN) to catalog and standardize proper names for stars. The WGSN approved the name Fuyue for this star on 30 June 2017 and it is now so included in the IAU Catalog of Star Names.

Properties

G Scorpii is an orange K-type giant. It is about 20% more massive than the Sun. The measured angular diameter is Template:Val. At the estimated distance of this system, this yields a physical size 16.4 times that of the Sun. With an effective surface temperature of Template:Val, it has a bolometric luminosity of Template:Solar luminosity.

Evolutionary models show that G Scorpii has probably left the red giant branch and is now fusing helium in its core. This makes it a red clump star, at the cool end of the horizontal branch.

Just 5 arcminutes to the east is the globular cluster NGC 6441. At magnitude 3.2, G Scorpii is around 40 times brighter than the entire globular cluster.