23 Aquilae

23 Aquilae
Location of 23 Aql (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila
Right ascension 19h 18m 32.49672s[1]
Declination +01° 05′ 06.4941″[1]
Apparent magnitude (V) 5.10[2]
Characteristics
Spectral type K1 II/III[3]
U−B color index +1.01[2]
B−V color index +1.15[2]
Astrometry
Radial velocity (Rv)−23.13±0.19[4] km/s
Proper motion (μ) RA: +11.242[1] mas/yr
Dec.: +15.753[1] mas/yr
Parallax (π)8.0976 ± 0.3042 mas
Distance400 ± 20 ly
(123 ± 5 pc)
Absolute magnitude (MV)+0.7[5]
Details
Radius19.04+0.41
−0.17[1] R☉
Luminosity164.789±6.995[1] L☉
Temperature4,740+153
−51[1] K
Rotational velocity (v sin i)10[6] km/s
Other designations
23 Aql, BD+00°4168, HD 180972, HIP 94885, HR 7319, SAO 124487[7]
Database references
SIMBADdata

23 Aquilae is a binary star[8] system in the equatorial constellation of Aquila. 23 Aquilae is its Flamsteed designation. It is at a distance of about 400 light-years (120 parsecs) with an apparent visual magnitude of 5.10,[2] which is bright enough to be faintly visible to the naked eye as an orange-hued star. The brightness of the star is diminished by 0.21 in magnitude because of extinction from interstellar dust and gas.[4] The system is moving closer to the Earth with a heliocentric radial velocity of –23 km/s.[4]

The primary component of this system is a magnitude 5.31 K-type giant star or bright giant with a stellar classification of K1.[9] The star is radiating 165 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,740 K.[1] Orbiting at an angular separation of 3.25 arcseconds is a magnitude 8.76 companion star.[8]

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  2. ^ a b c d Cite error: The named reference aass34_1 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference mk was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference aaa430_165 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference wilson was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference csrv239_1 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. ^ a b Cite error: The named reference mnras389_2_869 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference rob51 was invoked but never defined (see the help page).