Xi Aquarii

ξ Aquarii
Location of ξ Aquarii (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 21h 37m 45.10931s[1]
Declination –07° 51′ 15.1299″[1]
Apparent magnitude (V) 4.682[2]
Characteristics
Spectral type A7 V[3]
U−B color index +0.187[2]
B−V color index +0.181[2]
Astrometry
Radial velocity (Rv)–26.2[4] km/s
Proper motion (μ) RA: +114.20[1] mas/yr
Dec.: –25.03[1] mas/yr
Parallax (π)18.26 ± 0.24 mas[1]
Distance179 ± 2 ly
(54.8 ± 0.7 pc)
Absolute magnitude (MV)1.9[5]
Orbit[6]
Period (P)8,016 days
Eccentricity (e)0.54
Details
ξ Aqr A
Mass1.9[5] M☉
Surface gravity (log g)3.76[7] cgs
Temperature7,691[7] K
Metallicity [Fe/H]–0.03[7] dex
Rotational velocity (v sin i)170[8] km/s
ξ Aqr B
Mass0.9 ± 0.6[5] M☉
Other designations
Bunda, ξ Aqr, 23 Aqr, BD–08 5701, FK5 1569, HD 205767, HIP 106786, HR 8264, SAO 145537.[9]
Database references
SIMBADdata

Xi Aquarii (ξ Aquarii, abbreviated Xi Aqr, ξ Aqr) is a binary star system in the equatorial constellation of Aquarius. It is visible to the naked eye with an apparent visual magnitude of 4.7.[2] Based upon parallax measurements made during the Hipparcos mission, this system lies at a distance of around 179 light-years (55 parsecs) from the Sun.[1]

The two components are designated Xi Aquarii A (also named Bunda[10]) and B.

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  2. ^ a b c d Cite error: The named reference sps1966 was invoked but never defined (see the help page).
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  5. ^ a b c Cite error: The named reference al28_4_261 was invoked but never defined (see the help page).
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  7. ^ a b c Cite error: The named reference aaa515_A11 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference aaa463_2_671 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ "Naming Stars". IAU.org. Retrieved 18 June 2018.