Theta Aquarii
Star in the constellation Aquarius / From Wikipedia, the free encyclopedia
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"Ancha" redirects here. Not to be confused with Ankaa.
Theta Aquarii (θ Aquarii, abbreviated Theta Aqr, θ Aqr), officially named Ancha /ˈæŋkə/[7] (distinguish Ankaa, with the same pronunciation), is a star in the equatorial constellation of Aquarius. Visible to the naked eye at apparent magnitude 4.175,[2] it is located at a distance of around 187 light-years (57 parsecs) from the Sun.[1] Since it is near the ecliptic it can be occulted by the Moon, or very rarely by planets.
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Aquarius |
Right ascension | 22h 16m 50.03635s[1] |
Declination | –07° 46′ 59.8480″[1] |
Apparent magnitude (V) | 4.175[2] |
Characteristics | |
Spectral type | G8 III–IV[3] |
U−B color index | +0.818[2] |
B−V color index | +0.983[2] |
Astrometry | |
Radial velocity (Rv) | –13.77 ± 0.17[4] km/s |
Proper motion (μ) | RA: +118.80[1] mas/yr Dec.: –22.18[1] mas/yr |
Parallax (π) | 17.40 ± 0.23 mas[1] |
Distance | 187 ± 2 ly (57.5 ± 0.8 pc) |
Absolute magnitude (MV) | +0.23[3] |
Details | |
Mass | 2.39[5] to 2.78[3] M☉ |
Radius | 12[4] R☉ |
Luminosity | 72[4] to 83[3] L☉ |
Surface gravity (log g) | 2.8[4] cgs |
Temperature | 4,864[4] K |
Metallicity [Fe/H] | +0.01[4] to +0.09[3] dex |
Rotational velocity (v sin i) | 1.6[4] km/s |
Age | 437[3] Myr |
Other designations | |
Database references | |
SIMBAD | data |
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