89 Aquarii

This article is about c3 Aquarii. For other star systems with this Bayer designation, see c Aquarii.
89 Aquarii
Diagram showing star positions and boundaries of the Aquarius constellation and its surroundings
Location of 89 Aquarii (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 23h 09m 54.89736s[1]
Declination –22° 27′ 27.4192″[1]
Apparent magnitude (V) +4.69[2]
Characteristics
Spectral type G3 II + A2 V[3]
U−B color index +0.39[2]
B−V color index +0.65[2]
Astrometry
Radial velocity (Rv)-4.8[4] km/s
Proper motion (μ) RA: +32.61[1] mas/yr
Dec.: –9.76[1] mas/yr
Parallax (π)6.47 ± 0.68 mas[1]
Distanceapprox. 500 ly
(approx. 150 pc)
Absolute magnitude (MV)0.1/1.5[5]
Details
89 Aqr A
Mass2.9[5] M☉
Surface gravity (log g)3.62[6] cgs
Temperature5,640[6] K
Metallicity [Fe/H]+0.27[6] dex
Age320[5] Myr
89 Aqr B
Mass2.0[5] M☉
Temperature8,912[5] K
Other designations
CD–23 17771, HIP 114375, HR 8817, SAO 191687.[7]
89 Aqr A: HD 218640.
89 Aqr B: HD 218641.
Database references
SIMBADdata

89 Aquarii (abbreviated 89 Aqr) is a binary star[3] system in the equatorial constellation of Aquarius. 89 Aquarii is the Flamsteed designation, though it also bears the Bayer designation c3 Aquarii.[8] The apparent visual magnitude of +4.69[2] is bright enough to be seen with the naked eye. Its distance from Earth is roughly 500 light-years (150 pc), based upon parallax measurements with an 11% margin of error.[1]

The primary component of this system has a magnitude of 5.27 and a stellar classification of G3 II, which suggests this is an evolved star in the bright giant stage. The companion is an A-type main sequence star with a stellar classification of A2 V.[3] As of 2010, it is located at an angular separation of 0.1843 arcseconds along a position angle of 135.1°.[9] They orbit each other with an estimated period of 201 years and a semimajor axis of 0.45 arcseconds.[5]

  1. ^ a b c d e f Cite error: The named reference aaa474_2_653 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference aass34_1 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference mnras389_2_869 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference gcrv1953 was invoked but never defined (see the help page).
  5. ^ a b c d e f Cite error: The named reference aj127_5_2915 was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference apjss74 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ [1] database record, HD-DM-GC-HR-HIP-Bayer-Flamsteed Cross Index, N. D. Kostjuk, Institute of Astronomy of Russian Academy of Sciences, 2002; CDS ID IV/27A.
  9. ^ Cite error: The named reference pasp122_898_1483 was invoked but never defined (see the help page).