 Image captured from Mount Laguna, California | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Aquila |
| Right ascension | 19h 08m 59.90684s [1] |
| Declination | +06° 04′ 23.4857″ [1] |
| Apparent magnitude (V) | 5.227 [2] |
| Characteristics | |
| Spectral type | F0 III-IV [3] |
| Apparent magnitude (U) | 5.59±0.010 [4] |
| Apparent magnitude (B) | 5.57±0.007 [5] |
| Apparent magnitude (V) | 5.23±0.009 [5] |
| U−B color index | +0.020 [2] |
| B−V color index | +0.345 [2] |
| Variable type | suspected γ Dor [6] |
| Astrometry | |
| Radial velocity (Rv) | −46.7 [7] km/s |
| Proper motion (μ) | RA: −5.485 [1] mas/yr Dec.: −73.785 [1] mas/yr |
| Parallax (π) | 22.9563±0.2397 mas [1] |
| Distance | 142 ± 1 ly (43.6 ± 0.5 pc) |
| Absolute magnitude (MV) | 1.94 [8] |
| Details | |
| Mass | 1.54 [9] M☉ |
| Radius | 2.50+0.25 −0.05 [1] R☉ |
| Luminosity | 12.8±0.2 [1] L☉ |
| Surface gravity (log g) | 4.13 [3] cgs |
| Temperature | 6,784±53 [9] K |
| Metallicity [Fe/H] | +0.03 [3] dex |
| Rotational velocity (v sin i) | 57.0 [10] km/s |
| Age | 2.25 [9] Gyr |
| Other designations | |
| 19 Sge, BD+05°4040, FK5 3530, HD 178596, HIP 94068, HR 7266, SAO 124318 [11] | |
| Database references | |
| SIMBAD | data |
19 Aquilae is a single [12] star located 142 light-years (44 parsecs ) away from the Sun in the equatorial constellation of Aquila. 19 Aquilae is the Flamsteed designation. It is visible to the naked eye as a dim, yellow-white hued star with an apparent visual magnitude of 5.23. [2] The star is moving closer to the Earth with a heliocentric radial velocity of −46.7 km/s. [7]
This object has a stellar classification of F0 III-IV, [3] with the luminosity class matching an evolving star transitioning from the subgiant to a giant stage. Poretti et al. (2003) list it as a suspected Gamma Doradus variable, and it is located near the cooler end of the instability strip on the Hertzsprung–Russell diagram. [6] These spatial coordinates are a source of X-ray emission, which is most likely coming from the star. [13]
19 Aquilae is an estimated 2.25 [9] billion years old with a moderately high rate of spin, showing a projected rotational velocity of 57.0 km/s. [10] It has 1.54 [9] times the mass of the Sun and 2.50 [1] times the Sun's radius. The star is radiating 12.8 [1] times the luminosity of the Sun from its photosphere at an effective temperature of 6,784 K. [9]
