Psi Aquilae
Location of ψ Aquilae (circled) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquila[1] |
| Right ascension | 19h 44m 34.19086s[2] |
| Declination | +13° 18′ 10.0063″[2] |
| Apparent magnitude (V) | 6.25[3] |
| Characteristics | |
| Spectral type | B9 III-IV[4] |
| U−B color index | −0.22[5] |
| B−V color index | −0.04[5] |
| Astrometry | |
| Radial velocity (Rv) | −19.7±2.5[6] km/s |
| Proper motion (μ) | RA: +0.561 mas/yr[2] Dec.: −9.950 mas/yr[2] |
| Parallax (π) | 2.8253±0.0752 mas[2] |
| Distance | 1,150 ± 30 ly (354 ± 9 pc) |
| Absolute magnitude (MV) | −1.17[1] |
| Details | |
| Mass | 3.8[7] M☉ |
| Radius | 6.5[8] R☉ |
| Luminosity | 506[9] L☉ |
| Surface gravity (log g) | 3.41[7] cgs |
| Temperature | 10,167[7] K |
| Metallicity [Fe/H] | 0.21[7] dex |
| Rotation | 7.1[10] days |
| Rotational velocity (v sin i) | 20[11] km/s |
| Age | ~247[12] Myr |
| Other designations | |
| ψ Aql, 48 Aquilae, BD+12°4059, GC 27321, HD 186547, HIP 97139, HR 7511, SAO 105199, PPM 136885[3] | |
| Database references | |
| SIMBAD | data |
Psi Aquilae is a star in the equatorial constellation of Aquila. Its name is a Bayer designation that is Latinized from ψ Aquilae, and abbreviated Psi Aql or ψ Aql. This is a faint star with an apparent visual magnitude of 6.25,[3] 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,[2] which indicates a distance of approximately 1,150 light-years (350 parsecs). It is drifting closer to the Sun with a radial velocity of −20 km/s.[6]
The spectrum of Psi Aquilae matches a stellar classification of B9 III-IV,[4] 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 10,167 K,[7] giving it the blue-white hue of a B-type star.[13] It has nearly four times the mass of the Sun,[7] 6.5 times its radius,[8] and has a projected rotational velocity of 20 km/s.[11]
References
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- ^ a b c d e Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value). Gaia DR2 record for this source at VizieR.
- ^ a b c Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b c d e f Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
