11 Aquarii

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11 Aquarii
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 21h 00m 33.84082s[1]
Declination –04° 43′ 48.9421″[1]
Apparent magnitude (V) 6.216[2]
Spectral type G1 V[3]
U−B color index +0.22[4]
B−V color index +0.63[4]
Radial velocity (Rv)-17.8 ± 2[2] km/s
Proper motion (μ) RA: 48.78[1] mas/yr
Dec.: –138.84[1] mas/yr
Parallax (π)37.80 ± 1.01[1] mas
Distance86 ± 2 ly
(26.5 ± 0.7 pc)
Absolute magnitude (MV)4.10[2]
[2] M
Radius1.30[5] R
Surface gravity (log g)4.39[6] cgs
Temperature5,973[6] K
Metallicity [Fe/H]0.11[2]–0.28[6] dex
Rotational velocity (v sin i)5[7] km/s
Age4.7[2] Gyr
Other designations
HD 199960, HR 8041, SAO 145022, HIP 103682, BD−05° 5433
Database references

11 Aquarii (abbreviated 11 Aqr) is a sunlike star (G1V) in the constellation of Aquarius with an apparent magnitude is 6.22. 11 Aquarii is the Flamsteed designation. It is approximately 86 ly from Earth and is a main-sequence star of spectral type G1 and luminosity class V. Compared to the Sun, this star has a higher abundance of elements more massive than helium. This indicates it belongs to a class of stars called metal-rich. The star is slightly older than the Sun, but it has slightly more mass and has a larger radius.[2][5]


  1. ^ a b c d e van Leeuwen, Floor (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752v1Freely accessible, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357  Note: see VizieR catalogue I/311.
  2. ^ a b c d e f g Nordström, B.; et al. (May 2004), "The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ˜14 000 F and G dwarfs", Astronomy and Astrophysics, 418: 989–1019, arXiv:astro-ph/0405198Freely accessible, Bibcode:2004A&A...418..989N, doi:10.1051/0004-6361:20035959 
  3. ^ Buscombe, W. (1962), "Spectral classification of Southern fundamental stars", Mount Stromlo Observatory Mimeogram, 4, Bibcode:1962MtSOM...4....1B 
  4. ^ a b Cousins, A. W. J. (1964), "Photometric Data for Stars in the Equatorial Zone (Seventh List)", Monthly Notes of the Astronomical Society of Southern Africa, 23: 175, Bibcode:1964MNSSA..23..175C 
  5. ^ a b Takeda, Genya; et al. (February 2007), "Structure and Evolution of Nearby Stars with Planets. II. Physical Properties of ~1000 Cool Stars from the SPOCS Catalog", The Astrophysical Journal Supplement Series, 168 (2): 297–318, arXiv:astro-ph/0607235Freely accessible, Bibcode:2007ApJS..168..297T, doi:10.1086/509763 
  6. ^ a b c Sousa, S. G.; et al. (August 2007), "Spectroscopic parameters for 451 stars in the HARPS GTO planet search program. Stellar [Fe/H] and the frequency of exo-Neptunes", Astronomy and Astrophysics, 487 (1): 373–381, arXiv:0805.4826Freely accessible, Bibcode:2008A&A...487..373S, doi:10.1051/0004-6361:200809698 
  7. ^ Takeda, Yoichi; et al. (February 2005), "High-Dispersion Spectra Collection of Nearby F--K Stars at Okayama Astrophysical Observatory: A Basis for Spectroscopic Abundance Standards", Publications of the Astronomical Society of Japan, 57 (1): 13–25, Bibcode:2005PASJ...57...13T, doi:10.1093/pasj/57.1.13 

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