| Observation data EpochJ2000.0 EquinoxJ2000.0 | |
|---|---|
| Constellation | Hercules[1] |
| Right ascension | 16h 32m 35.7s[2] |
| Declination | +5° 31′ 16″[2] |
| Apparent magnitude (V) | 5.63[3] |
| Characteristics | |
| Evolutionary stage | main sequence[4] |
| Spectral type | B9.5III[5] |
| U−Bcolor index | −0.18[6] |
| B−Vcolor index | −0.06[6] |
| Astrometry | |
| Radial velocity (Rv) | −23.38±0.21[2] km/s |
| Proper motion (μ) | RA: +15.556[2]mas/yr Dec.: −0.282[2]mas/yr |
| Parallax (π) | 8.5519±0.1394 mas[2] |
| Distance | 381 ± 6 ly (117 ± 2 pc) |
| Absolute magnitude (MV) | +0.27[1] |
| Details | |
| Mass | 2.75[7] M☉ |
| Radius | 2.94[7] R☉ |
| Luminosity | 99[7] L☉ |
| Surface gravity (log g) | 3.94[7] cgs |
| Temperature | 10,623[7] K |
| Rotational velocity (v sin i) | 9.6[8] km/s |
| Age | 237[9] Myr |
| Other designations | |
| 28 Herculis,BD+05°3223,HD 149121,HIP 81007,HR 6158,SAO 121676[10] | |
| Database references | |
| SIMBAD | data |
n Herculis, also known as 28 Herculis, is amercury-manganese star[11] in the constellationHercules at a distance of approximately 381light-years (about 117parsecs) from theSun. Theapparent magnitude of the star is +5.6. Once in the constellationOphiuchus, it was also catalogued as 11 Ophiuchi.[10]
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 | This main-sequence-star-related article is astub. You can help Wikipedia byadding missing information. |
