11 Aquilae

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11 Aquilae
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila
Right ascension 18h 59m 05.74018s[1]
Declination +13° 37′ 20.0807″[1]
Apparent magnitude (V) 5.220[2]
Spectral type F8 V[3]
U−B color index +0.07[4]
B−V color index +0.53[4]
R−I color index 0.3
Radial velocity (Rv)+13.6[2] km/s
Proper motion (μ) RA: +18.86[1] mas/yr
Dec.: –125.16[1] mas/yr
Parallax (π)20.65 ± 0.25[1] mas
Distance158 ± 2 ly
(48.4 ± 0.6 pc)
Absolute magnitude (MV)2.96[5]
Luminosity19[6] L
Surface gravity (log g)3.94[5] cgs
Temperature6,074[5] K
Metallicity [Fe/H]–0.07[5] dex
Rotational velocity (v sin i)24.6 ± 0.7[7] km/s
Age1.5[2] Gyr
Other designations
BD+13° 3841, HD 176303, HIP 93203, HR 7172, SAO 104308.[8]
Database references

11 Aquilae (abbreviated 11 Aql) is a single[9] star in the equatorial constellation of Aquila. 11 Aquilae is the Flamsteed designation. It has an apparent visual magnitude of 5.2,[2] which means it is faintly visible to the naked eye. Based upon an annual parallax shift of 20.65 mas,[1] the distance to this star is approximately 158 light-years (48 parsecs). The brightness of this star is diminished by 0.33 in magnitude because of extinction from interstellar gas and dust.[6]

This is an F-type main sequence star with a stellar classification of F8 V.[3] It is radiating about 19[6] times the luminosity of the Sun from its outer atmosphere at an effective temperature of 6,074 K,[5] giving it the yellow-white glow of an F-type star.[10] 11 Aquilae has been listed as a candidate for membership in the Ursa Major Moving Group, but most likely does not belong to that association.[11]


  1. ^ a b c d e f van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752Freely accessible, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357. 
  2. ^ a b c d Holmberg, J.; Nordstrom, B.; Andersen, J. (July 2009), "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics", Astronomy and Astrophysics, 501 (3): 941–947, arXiv:0811.3982Freely accessible, Bibcode:2009A&A...501..941H, doi:10.1051/0004-6361/200811191. 
  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 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. 
  5. ^ a b c d e Balachandran, Suchitra (May 1, 1990), "Lithium depletion and rotation in main-sequence stars", Astrophysical Journal, Part 1, 354: 310–332, Bibcode:1990ApJ...354..310B, doi:10.1086/168691. 
  6. ^ a b c van Belle, G. T.; et al. (May 2008), "The Palomar Testbed Interferometer Calibrator Catalog", The Astrophysical Journal Supplement Series, 176 (1): 276–292, arXiv:0711.4194Freely accessible, Bibcode:2008ApJS..176..276V, doi:10.1086/526548. 
  7. ^ Reiners, A.; Schmitt, J. H. M. M. (February 2003), "Rotation and differential rotation in field F- and G-type stars", Astronomy and Astrophysics, 398: 647–661, Bibcode:2003A&A...398..647R, doi:10.1051/0004-6361:20021642. 
  8. ^ "* 11 Aql". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-07-26. 
  9. ^ 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:0806.2878Freely accessible, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x. 
  10. ^ "The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original on March 10, 2012, retrieved 2012-01-16. 
  11. ^ King, Jeremy R.; et al. (April 2003), "Stellar Kinematic Groups. II. A Reexamination of the Membership, Activity, and Age of the Ursa Major Group", The Astronomical Journal, 125 (4): 1980–2017, Bibcode:2003AJ....125.1980K, doi:10.1086/368241. 

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