Chi Aquarii

χ Aquarii
Location of χ Aquarii (circled)
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]
Distance610 ± 40 ly
(190 ± 10 pc)
Absolute magnitude (MV)−1.43[6]
Details
Radius142[7] R☉
Luminosity2,598[7] L☉
Surface gravity (log g)0.128[7] cgs
Temperature3,456[7] K
Other designations
χ Aqr, 92 Aquarii, BD−08 6076, HD 219576, HIP 114939, HR 8850, SAO 146612.[8]
Database references
SIMBADdata

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.

A light curve for Chi Aquarii, plotted from Hipparcos data[9]

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.[a] 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]

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  7. ^ a b c d Cite error: The named reference mcdonald2017 was invoked but never defined (see the help page).
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  11. ^ Cite error: The named reference mnras331_1_45 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference mnras400_4_1945 was invoked but never defined (see the help page).


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