| |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquila |
| Right ascension | 19h44m 34.19086s[1] |
| Declination | +13° 18′ 10.0063″[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: +0.561[1] mas/yr Dec.: –9.950[1] mas/yr |
| Parallax (π) | 2.8253 ± 0.0752 mas |
| Distance | 1,150 ± 30 ly (354 ± 9 pc) |
| Absolute magnitude (MV) | −1.17[6] |
| Details | |
| Radius | 3.7[7] R☉ |
| Luminosity | 341[6] L☉ |
| Temperature | 10,814±232[8] K |
| Rotational velocity (v sin i) | 20[9] km/s |
| Age | ~247[10] Myr |
| Other designations | |
ψ Aql, 48 Aquilae, BD+12° 4059, HD 186547, HIP 97139, HR 7511, SAO 105199[2] | |
| Database references | |
| SIMBAD | data |
Psi Aquilae, Latinized as ψ Aquilae, is the Bayer designation for a star in the equatorial constellationofAquila. 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 2.83 mas,[1] which indicates a distance of approximately 1,150 light-years (350 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,[8] giving it the blue-white hue of a B-type star.[11] It has nearly four[7] times the radius of the Sun and has a projected rotational velocity of 20 km/s.[9]
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