Global InformationUpsilon Herculis information
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Hercules |
| Right ascension | 16h 02m 47.89764s[1] |
| Declination | +46° 02′ 12.1371″[1] |
| Apparent magnitude (V) | 4.74[2] |
| Characteristics | |
| Spectral type | B9 III[3] |
| U−B color index | −0.32[2] |
| B−V color index | −0.11[2] |
| Astrometry | |
| Radial velocity (Rv) | +4.1±0.5[4] km/s |
| Proper motion (μ) | RA: +55.42[1] mas/yr Dec.: −61.29[1] mas/yr |
| Parallax (π) | 8.78 ± 0.18 mas[1] |
| Distance | 371 ± 8 ly (114 ± 2 pc) |
| Absolute magnitude (MV) | 0.32[5] |
| Details | |
| Radius | 4.0[6] R☉ |
| Luminosity | 173[7] L☉ |
| Surface gravity (log g) | 3.80[8] cgs |
| Temperature | 10,152[7] K |
| Metallicity [Fe/H] | −0.30[8] dex |
| Rotational velocity (v sin i) | 7.5[4] km/s |
| Age | 254[5] Myr |
| Other designations | |
υ Her, 6 Her, BD+46° 2142, HD 144206, HIP 78592, HR 5982, SAO 45865.[9] | |
| Database references | |
| SIMBAD | data |
Upsilon Herculis (υ Her) is a solitary[10] star in the constellation Hercules. It is visible to the naked eye with an apparent visual magnitude of 4.74.[2] Based upon an annual parallax shift of 8.78 mas as seen from Earth, it is located around 371 light years from the Sun. At that distance, the visual magnitude is diminished by an extinction factor of 0.09 due to interstellar dust.[5]
At an estimated age of 254 million years,[5] this appears to be an evolved B-type giant star with a stellar classification of B9 III.[3] It is a mercury-manganese chemically peculiar star, indicating the spectrum shows abnormal abundances of these elements.[4] The star has about four times the radius of the Sun and it radiates 173[7] times the Sun's luminosity from its photosphere at an effective temperature of 10,152 K.[7]
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