Chi Aquarii
Template:Location mark Location of χ Aquarii (circled) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquarius[1] |
| Right ascension | Template:RA[2] |
| Declination | Template:DEC[2] |
| Apparent magnitude (V) | Script error: No such module "val".[3] |
| Characteristics | |
| Spectral type | M3 III[4] |
| U−B Template:Engvar | +1.60[5] |
| B−V Template:Engvar | +1.60[5] |
| Variable type | SRb?[3] |
| Astrometry | |
| Radial velocity (Rv) | −13.72±0.86[6] km/s |
| Proper motion (μ) | RA: −17.721 mas/yr[2] Dec.: −13.676 mas/yr[2] |
| Parallax (π) | 6.1612±0.2060 mas[2] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | −1.43[1] |
| Details | |
| Radius | 142[7] Template:Solar radius |
| Luminosity | 2,598[7] Template:Solar luminosity |
| Surface gravity (log g) | 0.128[7] cgs |
| Temperature | 3,456[7] K |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[8] | |
| Database references | |
| SIMBAD | data |
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Chi Aquarii is a star in the equatorial constellation of Aquarius. Its name is a Bayer designation that is Latinized from χ Aquarii, and abbreviated Chi Aqr or χ Aqr. The distance to this star, based upon parallax measurements with a 7% margin of error,[2] is Script error: No such module "convert".. It is visible to the naked eye with an apparent visual magnitude of about 5.[3]
The variability of the brightness of Chi Aquarii was announced by Joel Stebbins and Charles Morse Huffer in 1928, based on observations made at Washburn Observatory.[10] 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]
This is an aging red giant star with a spectral classification of M3 III.[4] After the supply of hydrogen at its core was exhausted, it evolved off the main sequence, expanding to about 142 times the radius of the Sun.[7] The star is radiating 2,598 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 3,456 K.[7]
References
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