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Star in the constellation Aquarius From Wikipedia, the free encyclopedia
Tau1 Aquarii, Latinized from τ1 Aquarii, is the Bayer designation for a single[11] 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 355 light-years (109 parsecs) from Earth.[1] The star is drifting further away with a radial velocity of +15 km/s.[5] It is a candidate member of the Pisces-Eridanus stellar stream.[12]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Aquarius |
Right ascension | 22h 47m 42.76996s[1] |
Declination | –14° 03′ 23.1419″[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: +29.960[1] mas/yr Dec.: –9.009[1] mas/yr |
Parallax (π) | 9.1849 ± 0.1301 mas[1] |
Distance | 355 ± 5 ly (109 ± 2 pc) |
Absolute magnitude (MV) | +0.74[6] |
Details | |
Mass | 2.68±0.05[7] M☉ |
Radius | 2.0[8] R☉ |
Luminosity | 63.5[7] L☉ |
Temperature | 10,617[7] K |
Rotational velocity (v sin i) | 185[7] km/s |
Age | 100[9] Myr |
Other designations | |
Database references | |
SIMBAD | data |
The stellar classification of τ1 Aquarii is B9 V;[3] right along the borderline between a B- and A-type main sequence star. This is a candidate silicon star; a type of Ap star of class CP2 that shows a magnetic field.[13] It is around 100[9] million years old and is spinning rapidly with a projected rotational velocity of 185 km/s.[7] The star has 2.7[7] times the mass of the Sun and double the Sun's radius.[8] It is radiating 63.5[7] times the luminosity of the Sun from its photosphere at an effective temperature of 10,617 K.[7] When examined in the infrared band, it displays an excess emission that is a characteristic of stars with an orbiting debris disk. The model that best fits the data suggests there are two concentric circumstellar disks.[9]
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