Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Aquila |
Right ascension | 20h 29m 38.99995s [1] |
Declination | −02° 53′ 07.9176″ [1] |
Apparent magnitude (V) | 4.91 [2] |
Characteristics | |
Evolutionary stage | giant [3] |
Spectral type | K1/2 III [4] |
B−V color index | 1.162 [3] |
Astrometry | |
Radial velocity (Rv) | −22.51±0.16 [1] km/s |
Proper motion (μ) |
RA: +70.355
[1]
mas/
yr Dec.: –21.523 [1] mas/ yr |
Parallax (π) | 16.2388 ± 0.2271 mas [1] |
Distance | 201 ± 3
ly (61.6 ± 0.9 pc) |
Absolute magnitude (MV) | 0.97 [2] |
Details [3] | |
Mass | 1.54 [5] M☉ |
Radius | 11 R☉ |
Luminosity | 45.7 L☉ |
Surface gravity (log g) | 2.5 cgs |
Temperature | 4,529±5 K |
Metallicity [Fe/H] | 0.03 dex |
Rotational velocity (v sin i) | 4.0 km/s |
Age | 3.44 [5] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
69 Aquilae, abbreviated 69 Aql, is a star in the equatorial constellation of Aquila. 69 Aquilae is its Flamsteed designation. It is visible to the naked eye with an apparent visual magnitude of 4.91. [2] Based upon an annual parallax shift of 16.2 mas, [1] it is located 201 light years away. The star is moving closer to the Earth with a heliocentric radial velocity of −22.5 km/s. [1]
The stellar classification of 69 Aquilae is K1/2 III, [4] which means this is an evolved giant star. It belongs to a sub-category called the red clump, indicating that it is on the horizontal branch and is generating energy through helium fusion at its core. [7] The star is about 3.4 billion years old with 1.54 [5] times the mass of the Sun and has expanded to 11 times the Sun's radius. [3] It is radiating 45.7 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,529 K. [3]