106 Aquarii
Star in the constellation Aquarius
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106 Aquarii, abbreviated 106 Aqr, is a single[12] 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,[4] making it bright enough to be viewed from the suburbs according to the Bortle Dark-Sky Scale. An annual parallax shift of 8.61[8] milliarcseconds yields an estimated distance of around 380 light-years (120 parsecs) from Earth.
 | |
| Observation data Epoch J2000.0 (ICRS) Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Aquarius[2] |
| Right ascension | 23h 44m 12.07852s[3] |
| Declination | â18° 16â² 36.9999â³[3] |
| Apparent magnitude (V) | +5.244[4] |
| Characteristics | |
| Evolutionary stage | main sequence[5] |
| Spectral type | B9 V[6] |
| UâB color index | â0.239[4] |
| BâV color index | â0.086[4] |
| Astrometry | |
| Radial velocity (Rv) | +14.0[7] km/s |
| Proper motion (μ) | RA: +27.23[8] mas/yr Dec.: â2.94[8] mas/yr |
| Parallax (Ï) | 8.7588±0.2859 mas[3] |
| Distance | 370 ± 10 ly (114 ± 4 pc) |
| Absolute magnitude (MV) | â0.07[2] |
| Details | |
| Mass | 3.0[9] Mâ |
| Radius | 3.0[9] Râ |
| Luminosity | 146[9] Lâ |
| Surface gravity (log g) | 3.95±0.07[9] cgs |
| Temperature | 11,505±142[9] K |
| Rotational velocity (v sin i) | 328±48[10] km/s |
| Other designations | |
| i1 Aqr, 106 Aqr, BDâ19°6500, FK5 1621, HD 222847, HIP 117089, HR 8998, SAO 165854[11] | |
| Database references | |
| SIMBAD | data |
The spectrum of this star fits a stellar classification of B9 V,[6] indicating this is a B-type main sequence star. It is spinning rapidly with a projected rotational velocity of 328 km/s.[10] The star has three times the mass of the Sun and is radiating 146 times the Sun's luminosity from its photosphere at an effective temperature of 11,505 K.[9] X-ray emission with a luminosity of 6.0Ã1029 erg sâ1 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.[13]