| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Scorpius |
| Right ascension | 16h30m 12.47514s[1] |
| Declination | −25° 06′ 54.8043″[1] |
| Apparent magnitude (V) | 4.78[2] |
| Characteristics | |
| Spectral type | B3 V[3] |
| Astrometry | |
| Proper motion (μ) | RA: −4.45[1] mas/yr Dec.: −26.33[1] mas/yr |
| Parallax (π) | 7.89 ± 0.24 mas[1] |
| Distance | 410 ± 10 ly (127 ± 4 pc) |
| Absolute magnitude (MV) | −0.72[4] |
| Details | |
| Mass | 6.1±0.1[5] M☉ |
| Luminosity | 334.57[4] L☉ |
| Temperature | 19,600[2] K |
| Rotational velocity (v sin i) | 169±4[2] km/s |
| Age | 10.5±2.1[5] Myr |
| Other designations | |
i Sco, 22 Sco, CD−24°12695, HD 148605, HIP 80815, HR 6141, SAO 184429[6] | |
| Database references | |
| SIMBAD | data |
22 Scorpii (i Scorpii) is a single[7] star in the southern zodiac constellationofScorpius, about one degree from Antares. It is faintly visible to the naked eye with an apparent visual magnitude of 4.78.[2] The distance to this star is estimated to be around 410 light years, as derived from its annual parallax shiftof7.89±0.24 mas.[1] The star is embedded in, or adjacent to, the diffuse nebulous cloud IC 4605 located in the western regions of the Rho Ophiuchi cloud complex.[8]
22 Scorpii is a B-type main-sequence star with a stellar classification of B3 V.[3] It is ten[5] million years old and has a high rate of spin with a projected rotational velocity of 169 km/s.[2] The star has about six[5] times the mass of the Sun and is radiating 335[4] times the Sun's luminosity from its photosphere at an effective temperatureof19,600 K.[2]
