G Scorpii

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G Scorpii
Scorpius constellation map.svg
Red circle.svg
Location of G Scorpii (circled)
Observation data
Epoch J2000       Equinox J2000
Constellation Scorpius
Right ascension 17h 49m 51.48081s [1]
Declination −37° 02 35.8975 [1]
Apparent magnitude  (V)3.21 [2]
Characteristics
Evolutionary stage horizontal branch [3]
Spectral type K2 III [4]
U−B color index +1.19 [2]
B−V color index +1.17 [2]
Astrometry
Radial velocity (Rv)+24.7 [5]  km/s
Proper motion (μ)RA: 40.59 [1]   mas/yr
Dec.: 27.24 [1]   mas/yr
Parallax (π)25.92 ± 0.15  mas [1]
Distance 125.8 ± 0.7  ly
(38.6 ± 0.2  pc)
Absolute magnitude  (MV)+0.24 [6]
Details [3]
Mass 1.2±0.2  M
Radius 20±1  R
Luminosity 93±4  L
Surface gravity (log g)2.2  cgs
Temperature 4,535±125  K
Metallicity [Fe/H]−0.20 [7]   dex
Rotational velocity (v sin i)<1.0 [8]  km/s
Other designations
Fuyue, G Sco, γ Tel, FK5  669, HD  161892, HIP  87261, HR  6630, SAO  209318
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.

Contents

Nomenclature

G Scorpii below and right (ie. west) of NGC 6441 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. [9] It was resited in Scorpius and redesignated G Scorpii by Benjamin Apthorp Gould. [10]

In 2016, the IAU organized a Working Group on Star Names (WGSN) [11] 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 List of IAU-approved Star Names. [12]

G Scorpii bore the traditional name Fuyue (simplified Chinese :傅说; traditional Chinese :傅說) in ancient China. Fu Yue was a former slave that became a high-ranking minister to Shang dynasty ruler Wu Ding.

Properties

G Scorpii is an orange K-type giant. The measured angular diameter is 3.94±0.21  mas . [13] At the estimated distance of this system, this yields a physical size of about 16 times the radius of the Sun. [14] Calculations based on its physical properties give a diameter if about 20 R. With an effective surface temperature of 4,535  K , it has a bolometric luminosity of 93  L. [3]

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. [3]

Just 5 arcminutes to the east is the globular cluster NGC 6441. [15] At magnitude 3.2, G Scorpii is around 40 times brighter than the entire globular cluster.

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