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| Observation data Epoch J2000.0 (ICRS) Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 23h44m 12.07852s[2] |
| Declination | –18° 16′ 36.9999″[2] |
| Apparent magnitude (V) | +5.244[3] |
| Characteristics | |
| Spectral type | B9 V[4] |
| U−B color index | –0.239[3] |
| B−V color index | –0.086[3] |
| Astrometry | |
| Radial velocity (Rv) | +14.0[5] km/s |
| Proper motion (μ) | RA: +27.23[6] mas/yr Dec.: –2.94[6] mas/yr |
| Parallax (π) | 8.7588 ± 0.2859 mas[2] |
| Distance | 370 ± 10 ly (114 ± 4 pc) |
| Absolute magnitude (MV) | −0.07[7] |
| Details | |
| Mass | 3.0[8] M☉ |
| Radius | 2.7–3.2[9] R☉ |
| Luminosity | 151.88[7] L☉ |
| Surface gravity (log g) | 3.791±0.011[8] cgs |
| Temperature | 11,555±50[8] K |
| Rotational velocity (v sin i) | 328±48[8] km/s |
| Other designations | |
i1 Aqr, BD−19°6500, FK5 1621, HD 222847, HIP 117089, HR 8998, SAO 165854[10] | |
| Database references | |
| SIMBAD | data |
106 Aquarii, abbreviated 106 Aqr, is a single[11] star in the equatorial constellationofAquarius. 106 Aquarii is the Flamsteed designation, and it also bears the Bayer designation i1 Aquarii. It has an apparent visual magnitude of +5.2,[3] making it bright enough to be viewed from the suburbs according to the Bortle Dark-Sky Scale. An annual parallax shift of 8.61[6] 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,[4] indicating this is a B-type main sequence star. It is spinning rapidly with a projected rotational velocity of 328 km/s.[8] The star has 3[8] times the mass of the Sun and is radiating 152[7] times the Sun's luminosity from its photosphere at an effective temperature of 11,555 K.[8] X-ray emission with a luminosity of 6.0×1029 ergs−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.[12]
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