| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Hercules |
| Right ascension | 18h23m 41.88971s[1] |
| Declination | +21° 46′ 11.1096″[1] |
| Apparent magnitude (V) | 3.84[2] |
| Characteristics | |
| Evolutionary stage | horizontal branch[3] |
| Spectral type | K2IIIab[4] |
| B−V color index | 1.168±0.005[5] |
| Astrometry | |
| Radial velocity (Rv) | −57.55±0.27[6] km/s |
| Proper motion (μ) | RA: +195.971 mas/yr[1] Dec.: −243.234 mas/yr[1] |
| Parallax (π) | 26.9636 ± 0.1049 mas[1] |
| Distance | 121.0 ± 0.5 ly (37.1 ± 0.1 pc) |
| Absolute magnitude (MV) | +0.87[7] |
| Details[8] | |
| Mass | 1.05±0.18 M☉ |
| Radius | 11.55+0.20 −0.19 R☉ |
| Luminosity | 52.4±3 L☉ |
| Surface gravity (log g) | 2.24 cgs |
| Temperature | 4,569±60 K |
| Metallicity [Fe/H] | −0.06 dex |
| Rotational velocity (v sin i) | 4.4[6] km/s |
| Age | 6.39±2.71 Gyr |
| Other designations | |
109 Her, BD+21°3411, FK5 690, HD 169414, HIP 90139, HR 6895, SAO 86003, WDS J18237+2146[9] | |
| Database references | |
| SIMBAD | data |
109 Herculis is a single[10] star in the northern constellationofHercules. It is visible to the naked eye as a faint, orange-hued point of light with an apparent visual magnitude of 3.84.[2] The star is located around 121 light-years (37 parsecs) distant, based on parallax.[1] It is moving closer to the Earth with a heliocentric radial velocity of −58 km/s,[6] and may come as close as 81 light-years away in around 328,000 years.[5]
This is an aging giant star with a stellar classification of K2IIIab.[4] It is a red clump giant,[3] meaning it on the horizontal branch and is generating energy through helium fusion at its core. The star is roughly six billion years old with slightly more mass than the Sun.[8] With the supply of hydrogen at its core exhausted, it has expanded to nearly 12 times the Sun's radius.[8] The star is radiating 52 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,569 K.[8]
This star, together with 93 Her, 95 Her, and 102 Her, were consist Cerberus, the obsolete constellation[11]
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