66 Aquilae

66 Aquilae
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila
Right ascension 20h 13m 13.87230s[1]
Declination −01° 00′ 33.7724″[1]
Apparent magnitude (V) 5.44[2]
Characteristics
Spectral type K5 III[3]
B−V color index 1.430±0.001[2]
Astrometry
Radial velocity (Rv)−30.1±1.7[4] km/s
Proper motion (μ) RA: +32.872[1] mas/yr
Dec.: –15.851[1] mas/yr
Parallax (π)4.4436 ± 0.3133 mas[1]
Distance730 ± 50 ly
(230 ± 20 pc)
Absolute magnitude (MV)−1.20[2]
Details
Radius59[5] R☉
Luminosity634.65[2] L☉
Surface gravity (log g)1.84[6] cgs
Temperature4040[6] K
Metallicity [Fe/H]−0.20[6] dex
Other designations
66 Aql, BD−01° 3920, GC 28068, HD 192107, HIP 99631, HR 7720, SAO 144181[7]
Database references
SIMBADdata

66 Aquilae, abbreviated 66 Aql, is a fifth-magnitude star in the constellation of Aquila. 66 Aquilae is its Flamsteed designation. It is visible to the naked eye, having an apparent visual magnitude of 5.44.[2] The star shows an annual parallax shift of 4.4 mas,[1] which provides a distance estimate of around 730 light years. It is moving closer to the Earth with a heliocentric radial velocity of −30 km/s.[4] The motion of the star over time suggests some displacement, which may indicate it is a close binary system.[8]

This is an aging giant star with a stellar classification of K5 III,[3] which indicates it has exhausted the supply of hydrogen at its core and expanded off the main sequence. The measured angular diameter of this star, after correcting for limb darkening, is 2.44±0.03 mas.[9] At its estimated distance, this yields a physical size of roughly 59 times the radius of the Sun.[5] It is radiating 635[2] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,040 K,[6] giving the star an orange hue. This star was part of the obsolete constellation Anguilla.

  1. ^ a b c d e f Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Houk1999 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference lang2006 was invoked but never defined (see the help page).
  6. ^ a b c d Cite error: The named reference McWilliam1990 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference mason1999 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Richichi2005 was invoked but never defined (see the help page).