106 Aquarii
| Observation data Epoch J2000.0 (ICRS) Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 23h 44m 12.07852s |
| Declination | −18° 16′ 36.9999″ |
| Apparent magnitude (V) | +5.244 |
| Characteristics | |
| Spectral type | B9 V |
| U−B color index | −0.239 |
| B−V color index | −0.086 |
| Astrometry | |
| Radial velocity (Rv) | +14.0 km/s |
| Proper motion (μ) | RA: +27.23 mas/yr Dec.: −2.94 mas/yr |
| Parallax (π) | 8.7588±0.2859 mas |
| Distance | 370 ± 10 ly (114 ± 4 pc) |
| Absolute magnitude (MV) | −0.07 |
| Details | |
| Mass | 3.0 M☉ |
| Radius | 2.7–3.2 R☉ |
| Luminosity | 151.88 L☉ |
| Surface gravity (log g) | 3.791±0.011 cgs |
| Temperature | 11,555±50 K |
| Rotational velocity (v sin i) | 328±48 km/s |
| Other designations | |
| i1 Aqr, 106 Aqr, BD−19°6500, FK5 1621, HD 222847, HIP 117089, HR 8998, SAO 165854 | |
| Database references | |
| SIMBAD | data |
106 Aquarii, abbreviated 106 Aqr, is a single star in the equatorial constellation of Aquarius. 106 Aquarii is the Flamsteed designation, and it also bears the Bayer designation i1 Aquarii. It has an apparent visual magnitude of +5.2, making it bright enough to be viewed from the suburbs according to the Bortle Dark-Sky Scale. An annual parallax shift of 8.61 milliarcseconds yields an estimated distance of around 380 light-years (120 parsecs) from Earth.
The spectrum of this star fits a stellar classification of B9 V, indicating this is a B-type main sequence star. It is spinning rapidly with a projected rotational velocity of 328 km/s. The star has 3 times the mass of the Sun and is radiating 152 times the Sun's luminosity from its photosphere at an effective temperature of 11,555 K. X-ray emission with a luminosity of 6.0×1029 erg s−1 has been detected from this star. This is unusual since a B-type star normally does not have any significant X-ray emission. Instead, it may have an undetected lower mass companion.