Tau1 Aquarii
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 Location of τ1 Aquarii (circled) |
|
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Aquarius |
| Right ascension | 22h 47m 42.76932s[1] |
| Declination | –14° 03′ 23.1409″[1] |
| Apparent magnitude (V) | +5.66[2] |
| Characteristics | |
| Spectral type | B9 V[3] |
| U−B color index | –0.25[4] |
| B−V color index | –0.05[4] |
| Astrometry | |
| Radial velocity (Rv) | +15[5] km/s |
| Proper motion (μ) | RA: +30.61[1] mas/yr Dec.: –9.23[1] mas/yr |
| Parallax (π) | 10.27 ± 0.46[1] mas |
| Distance | 320 ± 10 ly (97 ± 4 pc) |
| Details | |
| Radius | 2.0[6] R☉ |
| Age | 100[7] Myr |
| Other designations | |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) |
|
Tau1 Aquarii (τ1 Aqr, τ1 Aquarii) is the Bayer designation for a star in the equatorial constellation of Aquarius. With an apparent visual magnitude of 5.66,[2] it is a faint naked eye that requires dark suburban skies for viewing. Parallax measurements made during the Hipparcos mission yield a distance estimate of roughly 320 light-years (98 parsecs) from Earth.[1]
τ1 Aquarii has a stellar classification of B9 V;[3] right along the borderline between a B- and A-type main sequence star. It is around 100[7] million years old and has twice the Sun's radius.[6] When examined in the infrared band, it displays an excess emission that is a characteristic of stars with an orbiting debris disk. Indeed, the model that best fits the data suggests there are two concentric circumstellar disks.[7]
References
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