Psi Aquilae
 Location of ψ Aquilae (circled) |
|
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Aquila |
| Right ascension | 19h 44m 34.19197s[1] |
| Declination | +13° 18′ 10.0203″[1] |
| Apparent magnitude (V) | 6.25[2] |
| Characteristics | |
| Spectral type | B9 III-IV[3] |
| U−B color index | –0.22[4] |
| B−V color index | –0.04[4] |
| Astrometry | |
| Radial velocity (Rv) | –18.3[5] km/s |
| Proper motion (μ) | RA: +2.17[1] mas/yr Dec.: –10.56[1] mas/yr |
| Parallax (π) | 3.22 ± 0.41 mas |
| Distance | approx. 1,000 ly (approx. 310 pc) |
| Details | |
| Radius | 3.7[6] R☉ |
| Temperature | 10,814 ± 232[7] K |
| Rotational velocity (v sin i) | 20[8] km/s |
| Other designations | |
Psi Aquilae (ψ Aql, ψ Aquilae) is the Bayer designation for a star in the equatorial constellation of Aquila. It is a faint star with an apparent visual magnitude of 6.25,[2] which, according to the Bortle Dark-Sky Scale, can be seen with the naked eye in dark rural skies. The orbit of the Earth causes an annual parallax shift of 3.22 mas,[1] which indicates a distance of roughly 1,000 light-years (310 parsecs).
The spectrum of Psi Aquilae matches a stellar classification of B9 III-IV,[3] with the luminosity class of III-IV indicating the spectrum lies part way between that of a subgiant and a giant star. The effective temperature of the star's outer atmosphere is 10,814 K,[7] giving it the blue-white hue of a B-type star.[9] It has nearly four[6] times the radius of the Sun and has a projected rotational velocity of 20 km/s.[8]
References
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- ↑ 2.0 2.1 2.2 Lua error in package.lua at line 80: module 'strict' not found.
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- ↑ 4.0 4.1 Lua error in package.lua at line 80: module 'strict' not found.
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- ↑ 6.0 6.1 Lua error in package.lua at line 80: module 'strict' not found.
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