101 Aquarii
Star in the constellation Aquarius
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101 Aquarii (abbreviated 101 Aqr) is a star in the equatorial constellation of Aquarius. 101 Aquarii is the Flamsteed designation, although it also bears the Bayer designation b3 Aquarii. 101 Aqr is a double star with the designation B 1900. The combined apparent visual magnitude of the pair is 4.71,[2] which is bright enough to be seen with the naked eye from the suburbs. The distance of this star from Earth is estimated as 290 light-years (89 parsecs) based upon parallax measurements.[1]
 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 23h 33m 16.62300s[1] |
| Declination | â20° 54â² 52.2155â³[1] |
| Apparent magnitude (V) | 4.71[2] |
| Characteristics | |
| Evolutionary stage | main sequence[3] |
| Spectral type | A0 V[4] |
| UâB color index | +0.00[2] |
| BâV color index | +0.02[2] |
| Astrometry | |
| Radial velocity (Rv) | +15[5] km/s |
| Proper motion (μ) | RA: â3.41[1] mas/yr Dec.: +8.46[1] mas/yr |
| Parallax (Ï) | 11.11±0.67 mas |
| Distance | 290 ± 20 ly (90 ± 5 pc) |
| Details | |
| Rotational velocity (v sin i) | 180[6] km/s |
| Other designations | |
| BDâ21 6437, HD 221565, HIP 116247, HR 8939, SAO 191988[7] | |
| Database references | |
| SIMBAD | data |
The brighter member of this system has an apparent magnitude of 4.81. It is an A-type main sequence star with a stellar classification of A0 V.[4] This star is spinning rapidly with a projected rotational velocity of 1 km/s.[6] The fainter companion is a magnitude 7.43 star at an angular separation of 0.840 arcseconds.[8]