Loading AI tools
Star in the constellation Hercules From Wikipedia, the free encyclopedia
g Herculis is a binary star[12] system in the northern constellation of Hercules. It has the Flamsteed designation 30 Herculis, while g Herculis is the Bayer designation. This system is visible to the naked eye as a faint, red-hued point of light. Based upon a measured parallax of 9.2 mas, it is located around 354 light years away from the Sun. The system is moving further from the Earth with a heliocentric radial velocity of 1.5 km/s.[6]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Hercules |
Right ascension | 16h 28m 38.54859s[2] |
Declination | +41° 52′ 54.0406″[2] |
Apparent magnitude (V) | 4.3 - 6.3[3] |
Characteristics | |
Evolutionary stage | AGB[4] |
Spectral type | M6− III[5] |
B−V color index | 1.289±0.024[6] |
Variable type | SRb[3] |
Astrometry | |
Radial velocity (Rv) | 1.49±0.38[6] km/s |
Proper motion (μ) | RA: +30.16[2] mas/yr Dec.: −5.14[2] mas/yr |
Parallax (π) | 9.21 ± 0.18 mas[2] |
Distance | 354 ± 7 ly (109 ± 2 pc) |
Absolute magnitude (MV) | −0.41[7] |
Orbit[4] | |
Period (P) | 843.7±21.1 d |
Eccentricity (e) | 0.37±0.11 |
Periastron epoch (T) | 2,451,918.2±43.9 HJD |
Argument of periastron (ω) (secondary) | 246±21° |
Semi-amplitude (K1) (primary) | 2.3±0.3 km/s |
Details | |
g Her A | |
Mass | 1.65±0.30[8] M☉ |
Radius | 230[9] R☉ |
Luminosity | 5,395[9] L☉ |
Surface gravity (log g) | 0.20[10] cgs |
Temperature | 3,263±23[9] K |
Metallicity [Fe/H] | −0.01[10] dex |
Other designations | |
Database references | |
SIMBAD | data |
This is a single-lined spectroscopic binary with an orbital period of 2.310 years and an eccentricity of 0.37.[4] The visible component is an aging red giant on the asymptotic giant branch[4] with a stellar classification of M6− III.[5] According to Samus et al. (2017), it is a semiregular variable of subtype SRb, which ranges between visual magnitudes 4.3 and 6.3 over 89.2 days.[3][13] It displays cyclical periods of 62.3, 89.5, and 888.9 days.[4] The star is surrounded by a circumstellar dust shell that seems primarily composed of oxides of iron, magnesium, and aluminium, rather than silicates.[14]
Seamless Wikipedia browsing. On steroids.
Every time you click a link to Wikipedia, Wiktionary or Wikiquote in your browser's search results, it will show the modern Wikiwand interface.
Wikiwand extension is a five stars, simple, with minimum permission required to keep your browsing private, safe and transparent.