15 Aquilae
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquila |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 5.41[2] |
| Characteristics | |
| Spectral type | K1 III[3] |
| U−B Template:Engvar | +1.01[2] |
| B−V Template:Engvar | +1.12[2] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[4] km/s |
| Proper motion (μ) | RA: +21.90[1] mas/yr Dec.: −26.05[1] mas/yr |
| Parallax (π) | 11.27±0.36 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | 0.414[5] |
| Details | |
| Radius | 14[4] Template:Solar radius |
| Luminosity | 83[4] Template:Solar luminosity |
| 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 |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[6] | |
| Database references | |
| SIMBAD | data |
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15 Aquilae (abbreviated 15 Aql) is a star in the equatorial constellation of Aquila. 15 Aquilae is the Flamsteed designation; it also bears the Bayer designation h Aquilae. The apparent visual magnitude is 5.41,[2] so it is faintly visible to the naked eye. An optical companion, HD 177442, is 39 arc seconds away from it[7] The distance to 15 Aquilae can be estimated from its annual parallax shift of 11.27 mas,[1] yielding a range of approximately Script error: No such module "convert". 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 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 Script error: No such module "convert". to the Galactic Center, and as far away as Script error: No such module "convert".. The orbital inclination carries it no more than Script error: No such module "convert". from the galactic plane.[5]
References
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- ↑ Template:Cite simbad
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