41 Aquarii

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41 Aquarii
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension  22h 14m 18.03271s[1]
Declination –21° 04′ 28.4330″[1]
Apparent magnitude (V) 5.354[2]
Spectral type K0 III + F8 V[3]
U−B color index +0.465[2]
B−V color index +0.834[2]
Radial velocity (Rv)–23.7[4] km/s
Proper motion (μ) RA: +24.30[1] mas/yr
Dec.: +56.07[1] mas/yr
Parallax (π)13.97 ± 0.73[1] mas
Distance230 ± 10 ly
(72 ± 4 pc)
Surface gravity (log g)2.85[5] cgs
Temperature4,750[5] K
Metallicity [Fe/H]–0.13[5] dex
Other designations
BD–21 6180, HD 210960, HIP 109786, HR 8480, SAO 190986.[6]
Database references

41 Aquarii (abbreviated 41 Aqr) is a double star[3] in the equatorial constellation of Aquarius. 41 Aquarii is its Flamsteed designation. Its apparent magnitude is 5.354[2] and is located at a distance of around 230 light-years (71 parsecs) from Earth. The brighter component is a red clump[7] giant star with a stellar classification of K0 III and a magnitude of 5.73. At an angular separation of 5.148 arcseconds, the fainter companion is an F-type main sequence star with a magnitude 7.16 and a classification of F8 V.[3]


  1. ^ a b c d e 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 Rakos, K. D.; et al. (February 1982), "Photometric and astrometric observations of close visual binaries", Astronomy and Astrophysics Supplement Series, 47: 221–235, Bibcode:1982A&AS...47..221R.
  3. ^ a b c 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.
  4. ^ Wilson, Ralph Elmer (1953), General Catalogue of Stellar Radial Velocities, Washington: Carnegie Institution of Washington, Bibcode:1953GCRV..C......0W.
  5. ^ a b c McWilliam, Andrew (December 1990), "High-resolution spectroscopic survey of 671 GK giants", Astrophysical Journal Supplement Series, 74: 1075–1128, Bibcode:1990ApJS...74.1075M, doi:10.1086/191527.
  6. ^ "41 Aqr -- Star in double system", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2012-02-23.
  7. ^ Alves, David R. (August 2000), "K-Band Calibration of the Red Clump Luminosity", The Astrophysical Journal, 539 (2): 732–741, arXiv:astro-ph/0003329, Bibcode:2000ApJ...539..732A, doi:10.1086/309278.