  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquila |
| Right ascension | 19h 18m 32.49672s [1] |
| Declination | +01° 05′ 06.4941″ [1] |
| Apparent magnitude (V) | 5.10 [2] |
| Characteristics | |
| Spectral type | K1 II/III [3] |
| U−B color index | +1.01 [2] |
| B−V color index | +1.15 [2] |
| Astrometry | |
| Radial velocity (Rv) | −23.13±0.19 [4] km/s |
| Proper motion (μ) | RA: +11.242 [1] mas/yr Dec.: +15.753 [1] mas/yr |
| Parallax (π) | 8.0976±0.3042 mas |
| Distance | 400 ± 20 ly (123 ± 5 pc) |
| Absolute magnitude (MV) | +0.7 [5] |
| Details | |
| Mass | 1.1 [6] M☉ |
| Radius | 21 [7] R☉ |
| Luminosity | 197 [7] L☉ |
| Surface gravity (log g) | 1.85 [6] cgs |
| Temperature | 4,202 [6] K |
| Metallicity [Fe/H] | 0.13 [6] dex |
| Rotational velocity (v sin i) | 10 [8] km/s |
| Other designations | |
| 23 Aql, BD+00°4168, HD 180972, HIP 94885, HR 7319, SAO 124487 [9] | |
| Database references | |
| SIMBAD | data |
23 Aquilae is a binary star [10] system in the equatorial constellation of Aquila. 23 Aquilae is its Flamsteed designation. It is at a distance of about 400 light-years (120 parsecs ) with an apparent visual magnitude of 5.10, [2] which is bright enough to be faintly visible to the naked eye as an orange-hued star. The brightness of the star is diminished by 0.21 in magnitude because of extinction from interstellar dust and gas. [4] The system is moving closer to the Earth with a heliocentric radial velocity of –23 km/s. [4]
The primary component of this system is a magnitude 5.31 K-type giant star or bright giant with a stellar classification of K1. [11] The star is radiating 197 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,202 K . [6] Orbiting at an angular separation of 3.25 arcseconds is a magnitude 8.76 companion star. [10]
