89 Aquarii
 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[1] mas |
| Distance | approx. 500 ly (approx. 150 pc) |
| Absolute magnitude (MV) | 0.1/1.5[5] |
| Details | |
| 89 Aqr A | |
| Mass | 2.9[5] M☉ |
| Surface gravity (log g) | 3.62[6] cgs |
| Temperature | 5,640[6] K |
| Metallicity [Fe/H] | +0.27[6] dex |
| Age | 320[5] Myr |
| 89 Aqr B | |
| Mass | 2.0[5] M☉ |
| Temperature | 8,912[5] K |
| Other designations | |
| 89 Aqr A: HD 218640. | |
| 89 Aqr B: HD 218641. | |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) |
|
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]
References
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- ↑ [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.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
