23 Aquilae

From Wikipedia, the free encyclopedia
Jump to: navigation, search
23 Aquilae
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila
Right ascension 19h 18m 32.49608s[1]
Declination +01° 05′ 06.4602″[1]
Apparent magnitude (V) 5.10[2]
Spectral type K2 Iab[3]
U−B color index +1.01[2]
B−V color index +1.15[2]
R−I color index 0.58
Radial velocity (Rv) –23.13 ± 0.19[4] km/s
Proper motion (μ) RA: +12.30[1] mas/yr
Dec.: +17.47[1] mas/yr
Parallax (π) 8.79 ± 0.51 mas
Distance 370 ± 20 ly
(114 ± 7 pc)
Rotational velocity (v sin i) 10[5] km/s
Other designations
23 Aql, BD+00 4168, HD 180972, HIP 94885, HR 7319, SAO 124487.[6]

23 Aquilae is the Flamsteed designation for a binary star[7] in the equatorial constellation of Aquila. It is at a distance of about 370 light-years (110 parsecs) with an apparent visual magnitude of 5.10.[2] The brightness of the star is diminished by 0.21 in magnitude because of extinction from interstellar dust and gas.[4] The primary component of this system is a magnitude 5.31 K-type supergiant star with a stellar classification of K2 Iab.[3] At an angular separation of 3.25 arcseconds is a magnitude 8.76 companion star.[7]


  1. ^ a b c d van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357. 
  2. ^ a b c d Nicolet, B. (1978), "Photoelectric photometric Catalogue of homogeneous measurements in the UBV System", Astronomy and Astrophysics Supplement Series 34: 1–49, Bibcode:1978A&AS...34....1N. 
  3. ^ a b Eggen, O. J. (1962), "Space-velocity vectors for 3483 stars with proper motion and radial velocity", Royal Observatory Bulletin 51, Bibcode:1962RGOB...51...79E. 
  4. ^ a b Famaey, B. et al. (January 2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters", Astronomy and Astrophysics 430 (1): 165–186, arXiv:astro-ph/0409579, Bibcode:2005A&A...430..165F, doi:10.1051/0004-6361:20041272. 
  5. ^ Bernacca, P. L.; Perinotto, M. (1970), "A catalogue of stellar rotational velocities", Contributi Osservatorio Astronomico di Padova in Asiago 239 (1), Bibcode:1970CoAsi.239....1B. 
  6. ^ "23 Aql -- Star", SIMBAD Astronomical Object Database (Centre de Données astronomiques de Strasbourg), retrieved 2012-07-25 
  7. ^ a b Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x. 

External links[edit]