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]
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 | |
Database references | |
SIMBAD | data |
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]