Chi Aquarii, Latinized from χ Aquarii, is the Bayer designation of a star in the equatorial constellation of Aquarius. The distance to this star, based upon parallax measurements with a 7% margin of error, is roughly 610 light-years (190 parsecs). It is visible to the naked eye with an apparent visual magnitude of about 5.
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Aquarius |
Right ascension | 23h 16m 50.93916s[1] |
Declination | −07° 43′ 35.4023″[1] |
Apparent magnitude (V) | 4.75 - 5.10[2] |
Characteristics | |
Spectral type | M3 III[3] |
U−B color index | +1.60[4] |
B−V color index | +1.60[4] |
Variable type | SRb?[2] |
Astrometry | |
Radial velocity (Rv) | −13.72 ± 0.86[5] km/s |
Proper motion (μ) | RA: −19.18[1] mas/yr Dec.: −14.10[1] mas/yr |
Parallax (π) | 5.32 ± 0.37 mas[1] |
Distance | 610 ± 40 ly (190 ± 10 pc) |
Absolute magnitude (MV) | −1.43[6] |
Details | |
Radius | 142[7] R☉ |
Luminosity | 2,598[7] L☉ |
Surface gravity (log g) | 0.128[7] cgs |
Temperature | 3,456[7] K |
Other designations | |
Database references | |
SIMBAD | data |
This is a red giant star with a spectral classification of M3 III.[3] The interferometry-measured angular diameter of this star is 6.70 ± 0.15 mas,[10] which, at its estimated distance, equates to a physical radius of about 137 times the radius of the Sun.[lower-alpha 1] It is classified as a semi-regular variable star and its brightness varies by an amplitude of 0.0636 in magnitude.[11] The identified pulsation periods are 32.3, 38.5, and 44.9 days.[12]
Notes
- The radius (R*) is given by [13]
References
External links
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