69 Aquilae

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]

69 Aquilae

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	red clump[3]
Spectral type	K1/2 III[4]
B−V color index	1.162[5]
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[5]
Mass	1.54[6] 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[6] Gyr
Other designations
69 Aql, BD−03°4918, HD 195135, HIP 101101, HR 7831, SAO 144495[7]
Database references
SIMBAD	data

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.^[3] The star is about 3.4 billion years old with 1.54^[6] times the mass of the Sun and has expanded to 11 times the Sun's radius.^[5] It is radiating 45.7 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,529 K.^[5]