  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquila |
| Right ascension | 19h 48m 42.05765s[1] |
| Declination | +11° 48′ 57.2177″[1] |
| Apparent magnitude (V) | 5.85 (6.47/6.75)[2] |
| Characteristics | |
| Spectral type | G8 III: + A1 V[2][3] |
| Astrometry | |
| Radial velocity (Rv) | +12.6[3] km/s |
| Proper motion (μ) | RA: +16.16[1]mas/yr Dec.: –10.60[1]mas/yr |
| Parallax (π) | 6.34±0.52 mas[1] |
| Distance | 510 ± 40 ly (160 ± 10 pc) |
| Absolute magnitude (MV) | −0.22[4] |
| Details | |
| Luminosity | 108[4] L☉ |
| Other designations | |
| π Aql,52 Aquilae,BD+11 3994,HIP 97473,HR 7544,SAO 105282[5] | |
| A:HD 187259 | |
| B:HD 187260 | |
| Database references | |
| SIMBAD | data |
| A | |
| B | |
Pi Aquilae,Latinised from π Aquilae, is theBayer designation for abinary star[2] system in theequatorialconstellation ofAquila, about 3° to the north of the bright starAltair.[3] Theapparent visual magnitude of the system is 5.85,[2] making it faintly visible to the naked eye fromdark suburban skies. Based upon an annualparallax shift of 6.34 mas, the distance to this system is roughly 510light-years (160parsecs).[1]
The binary nature of this system was first discovered byWilliam Herschel in 1785.[3] The primary component of is a magnitude 6.47[2]giant star with astellar classification of G8 III:.[2] A companion star at anangular separation of 1.437 arcseconds is anA-type main-sequence star with a classification of A1 V.[2] It is slightly fainter, with an apparent magnitude of 6.75.[2]
