19 Aquilae

19 Aquilae

Image captured from Mount Laguna, California
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Aquila
Right ascension 19h 08m 59.90684s[1]
Declination +06° 04′ 23.4857″[1]
Apparent magnitude (V) 5.227[2]
Characteristics
Spectral type F0 III-IV[3]
Apparent magnitude (U) 5.59±0.010[4]
Apparent magnitude (B) 5.57±0.007[5]
Apparent magnitude (V) 5.23±0.009[5]
U−B color index +0.020[2]
B−V color index +0.345[2]
Variable type suspected γ Dor[6]
Astrometry
Radial velocity (Rv)−46.7[7] km/s
Proper motion (μ) RA: −5.485[1] mas/yr
Dec.: −73.785[1] mas/yr
Parallax (π)22.9563 ± 0.2397 mas[1]
Distance142 ± 1 ly
(43.6 ± 0.5 pc)
Absolute magnitude (MV)1.94[8]
Details
Mass1.54[9] M☉
Radius2.50+0.25
−0.05[1] R☉
Luminosity12.8±0.2[1] L☉
Surface gravity (log g)4.13[3] cgs
Temperature6,784±53[9] K
Metallicity [Fe/H]+0.03[3] dex
Rotational velocity (v sin i)57.0[10] km/s
Age2.25[9] Gyr
Other designations
19 Sge, BD+5°4040, FK5 3530, HD 178596, HIP 94068, HR 7266, SAO 124318[11]
Database references
SIMBADdata

19 Aquilae is a single[12] star located 142 light-years (44 parsecs) away from the Sun in the equatorial constellation of Aquila. 19 Aquilae is the Flamsteed designation. It is visible to the naked eye as a dim, yellow-white hued star with an apparent visual magnitude of 5.23.[2] The star is moving closer to the Earth with a heliocentric radial velocity of −46.7 km/s.[7]

This object has a stellar classification of F0 III-IV,[3] with the luminosity class matching an evolving star transitioning from the subgiant to a giant stage. Poretti et al. (2003) list it as a suspected Gamma Doradus variable, and it is located near the cooler end of the instability strip on the Hertzsprung–Russell diagram.[6] These spatial coordinates are a source of X-ray emission, which is most likely coming from the star.[13]

19 Aquilae is an estimated 2.25[9] billion years old with a moderately high rate of spin, showing a projected rotational velocity of 57.0 km/s.[10] It has 1.54[9] times the mass of the Sun and 2.50[1] times the Sun's radius. The star is radiating 12.8[1] times the luminosity of the Sun from its photosphere at an effective temperature of 6,784 K.[9]

  1. ^ a b c d e f g h i Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference aaass65_2_405 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference apj354 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Oja1984 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Oja1993 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference poretti was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference scfs was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference cgssn09 was invoked but never defined (see the help page).
  9. ^ a b c d e f Cite error: The named reference Luck2015 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference aaa493_3_1099 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Simbad was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Haakonsen2009 was invoked but never defined (see the help page).