15 Aquilae
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Aquila |
| Right ascension | 19h 04m 57.67233s[1] |
| Declination | –04° 01′ 53.1059″[1] |
| Apparent magnitude (V) | 5.41[2] |
| Characteristics | |
| Spectral type | K1 III[3] |
| U−B color index | +1.01[2] |
| B−V color index | +1.12[2] |
| Astrometry | |
| Radial velocity (Rv) | –23.17 ± 0.61[4] km/s |
| Proper motion (μ) | RA: +21.90[1] mas/yr Dec.: -26.05[1] mas/yr |
| Parallax (π) | 11.27 ± 0.36[1] mas |
| Distance | 289 ± 9 ly (89 ± 3 pc) |
| Absolute magnitude (MV) | 0.414[5] |
| Details | |
| Radius | 14[4] R☉ |
| Luminosity | 83[4] L☉ |
| Surface gravity (log g) | 2.65[3] cgs |
| Temperature | 4,560[3] K |
| Metallicity [Fe/H] | –0.25[3] dex |
| Rotational velocity (v sin i) | 3.4[4] km/s |
| Age | 4.09 ± 2.07[5] Gyr |
| Other designations | |
15 Aquilae (abbreviated 15 Aql) is a star in the equatorial constellation of Aquila. 15 Aquilae is the Flamsteed designation though it also bears the Bayer designation h Aquilae. The apparent visual magnitude of this star is 5.41,[2] meaning that it is faintly visible to the naked eye. It has a nearby optical companion, HD 177442.[7] The distance to 15 Aquilae can be estimated from its annual parallax shift of 11.27 mas,[1] yielding a range of approximately 289 light-years (89 parsecs) from Earth with a 9 light-year margin of error.
With a stellar classification of K1 III,[3] the spectrum of 15 Aquilae matches a giant star with an estimated age of roughly four billion years.[5] At this stage of its evolution, the outer atmosphere of the star has expanded to 14[4] times the radius of the Sun. It is radiating 83[4] times the Sun's luminosity into space at an effective temperature of 4,560 K.[3] This heat gives it the orange-hued glow of a K-type star.[8]
This star is most likely a member of the thin disk population of the Milky Way. It is orbiting through the galaxy with an eccentricity of 0.06, which carries it as close as 24.30 kly (7.45 kpc) to the Galactic Core, and as far away as 27.60 kly (8.46 kpc). The orbital inclination carries it no more than 196 ly (60 pc) from the galactic plane.[5]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 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.
- ↑ 4.0 4.1 4.2 4.3 4.4 4.5 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 5.0 5.1 5.2 5.3 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
