69 Aquilae
Star in the constellation Aquila
From Wikipedia, the free encyclopedia
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]
| 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]