Epsilon2 Arae
From Infogalactic: the planetary knowledge core
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 The location of ε2 Arae (circled) |
|
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Ara |
| Right ascension | 17h 03m 08.70964s[1] |
| Declination | –53° 14′ 13.3020″[1] |
| Apparent magnitude (V) | 5.29[2] (5.44/8.65)[3] |
| Characteristics | |
| Spectral type | F5 V Fe+0.5[4] |
| U−B color index | +0.015[5] |
| B−V color index | +0.48[2] |
| Astrometry | |
| Radial velocity (Rv) | +4.9[6] km/s |
| Proper motion (μ) | RA: +0.15[1] mas/yr Dec.: −165.20[1] mas/yr |
| Parallax (π) | 36.73 ± 0.63[1] mas |
| Distance | 89 ± 2 ly (27.2 ± 0.5 pc) |
| Absolute magnitude (MV) | 3.27[7] |
| Details | |
| Surface gravity (log g) | 4.29[7] cgs |
| Temperature | 6,577[7] K |
| Metallicity [Fe/H] | +0.02[7] dex |
| Rotational velocity (v sin i) | 45.4[8] km/s |
| Age | 1.9[6] Gyr |
| Other designations | |
Epsilon2 Arae (ε2 Arae, ε2 Ara) is the Bayer designation for a double star in the southern constellation of Ara. It is approximately 89 light-years (27 parsecs) distant from Earth. With an apparent visual magnitude of 5.3,[2] it is faintly visible to the naked eye.
The brighter star is a magnitude 5.44 F-type main sequence star with a stellar classification of F5 V Fe+0.5.[4] The Fe+0.5 notation indicates that it has a somewhat higher than normal abundance of iron. It has a magnitude 8.65 companion at an angular separation of 0.590 arcseconds.[3] It has a common proper motion white dwarf companion, WDS J17031-5314, with a magnitude of 13.47.[9]
References
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- ↑ 2.0 2.1 2.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 3.0 3.1 Lua error in package.lua at line 80: module 'strict' not found.
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- ↑ 5.0 5.1 Lua error in package.lua at line 80: module 'strict' not found.
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- ↑ 7.0 7.1 7.2 7.3 Lua error in package.lua at line 80: module 'strict' not found.
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