21 Aquilae
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Aquila |
| Right ascension | 19h 13m 42.70359s[1] |
| Declination | +02° 17′ 37.3403″[1] |
| Apparent magnitude (V) | 5.140[2] |
| Characteristics | |
| Spectral type | B8 II-III[3] |
| U−B color index | –0.399[2] |
| B−V color index | –0.065[2] |
| Variable type | α2 CVn |
| Astrometry | |
| Radial velocity (Rv) | –5.2[4] km/s |
| Proper motion (μ) | RA: +6.95[1] mas/yr Dec.: –3.28[1] mas/yr |
| Parallax (π) | 4.59 ± 0.29[1] mas |
| Distance | 710 ± 40 ly (220 ± 10 pc) |
| Details | |
| Radius | 4.3[5] R☉ |
| Surface gravity (log g) | 3.27[3] cgs |
| Temperature | 13,175[3] K |
| Metallicity [Fe/H] | –0.14[3] dex |
| Other designations | |
21 Aquilae (abbreviated 21 Aql) is a star in the equatorial constellation of Aquila. 21 Aquilae is its Flamsteed designation. Its apparent magnitude is 5.14[2] and it is located at a distance of around 710 light-years (220 parsecs) from Earth, give or take a 40 light-year margin of error.[1] The stellar classification of this star is B8 II-III,[3] with the luminosity class of II-III suggesting that the spectrum displays elements of both a giant star and a bright giant. The outer atmosphere has an effective temperature of 13,175 K;[3] this searing heat gives it the blue-white glow of a B-type star.[7]
References
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- ↑ 2.0 2.1 2.2 2.3 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 Lua error in package.lua at line 80: module 'strict' not found.
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- ↑ Lua error in package.lua at line 80: module 'strict' not found.
External linkls
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