Mu Aquilae

Mu Aquilae
Location of μ Aquilae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila
Right ascension 19h 34m 05.3529s[1]
Declination +07° 22′ 44.189″[1]
Apparent magnitude (V) 4.45[2]
Characteristics
Spectral type K3-IIIb Fe0.5[3]
U−B color index +1.24[2]
B−V color index +1.176[4]
R−I color index 0.61
Astrometry
Radial velocity (Rv)−24.73±0.13[5] km/s
Proper motion (μ) RA: +213.73[1] mas/yr
Dec.: −156.55[1] mas/yr
Parallax (π)30.31 ± 0.24 mas[1]
Distance107.6 ± 0.9 ly
(33.0 ± 0.3 pc)
Absolute magnitude (MV)1.80[5]
Details[6]
Mass1.16±0.10 M☉
Radius7.43±0.15[7] R☉
Luminosity24.5 L☉
Surface gravity (log g)2.70±0.06 cgs
Temperature4,567±79 K
Metallicity [Fe/H]0.16 dex
Rotational velocity (v sin i)0.0[4] km/s
Age6.71±2.19 Gyr
Other designations
μ Aql, 38 Aql, BD+07 4132, FK5 1511, GJ 9661, HD 184406, HIP 96229, HR 7429, SAO 124799, LTT 15709[8]
Database references
SIMBADdata

Mu Aquilae, Latinized from μ Aquilae, is the Bayer designation for a single[9] star in the equatorial constellation of Aquila. With an apparent visual magnitude of 4.45,[2] it is visible to the naked eye. The measured annual parallax shift of this star is 30.31 mas,[1] which gives a distance estimate of 107.6 light-years (33.0 parsecs) from Earth. It is drifting closer with a radial velocity of −25 km/s,[5] and displays a relatively high proper motion, traversing the celestial sphere at the rate of 0.264″ per year.[10]

The stellar classification of Mu Aquilae is K3-IIIb Fe0.5,[3] indicating that this is an evolved giant star with a mild overabundance of iron appearing in its spectrum. It belongs to a sub-category of giants called the red clump, which means it is generating energy through the fusion of helium at its core.[11] Compared to the Sun, it has 116% of the mass and has expanded to 7.7 times the size. This inflated outer envelope has an effective temperature of 4,567 K and is radiating 24.5 times the Sun's luminosity.[6] At this heat, Mu Aquilae glows with the orange hue of a K-type star.[12] It is roughly seven billion years old.[6]

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  2. ^ a b c Cite error: The named reference clpl4_99 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Keenan_McNeil_1989 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference aj135_1_209 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference aaa454_3_943 was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference Villaver_et_al_2013 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Baines2023 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Eggleton_Tokovinin_2008 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Lepine_Shara_2005 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference apj539_2_732 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference csiro was invoked but never defined (see the help page).