69 Aquilae

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 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]
Distance201 ± 3 ly
(61.6 ± 0.9 pc)
Absolute magnitude (MV)0.97[2]
Details[3]
Mass1.54[5] M☉
Radius11 R☉
Luminosity45.7 L☉
Surface gravity (log g)2.5 cgs
Temperature4,529±5 K
Metallicity [Fe/H]0.03 dex
Rotational velocity (v sin i)4.0 km/s
Age3.44[5] Gyr
Other designations
69 Aql, BD−03° 4918, HD 195135, HIP 101101, HR 7831, SAO 144495[6]
Database references
SIMBADdata

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]

  1. ^ a b c d e f g h Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b c d e Cite error: The named reference Massarotti2008 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Houk1999 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference Luck2015 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Alves2000 was invoked but never defined (see the help page).