17_Aquarii

17 Aquarii

17 Aquarii

Star in the constellation Aquarius

17 Aquarii, abbreviated 17 Aqr, is a spectroscopic binary[5] star system in the constellation of Aquarius. 17 Aquarii is the Flamsteed designation. It appears to the naked eye as a faint sixth magnitude star, having a combined apparent visual magnitude of 5.99.[2] The distance to 17 Aqr can be estimated from its annual parallax shift of 4.9 mas,[1] which yields a separation of around 660 light years. It is moving further away with a heliocentric radial velocity of 18 km/s.[4]

Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...

A preliminary orbit for the pair gives a period of 20 years and an eccentricity of 0.4.[5] The primary component is an aging giant star with a stellar classification of K4/5 III.[3] It is radiating 495[2] times the Sun's luminosity from its photosphere at an effective temperature of 3,951 K.[6]

References

  1. [1]
    Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051.
  2. [2]
    Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
  3. [3]
    Houk, N.; Swift, C. (1999), "Michigan catalogue of two-dimensional spectral types for the HD Stars", Michigan Spectral Survey, 5, Bibcode:1999MSS...C05....0H.
  4. [4]
    Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.
  5. [5]
    Famaey, B.; et al. (2009). "Spectroscopic binaries among Hipparcos M giants,. I. Data, orbits, and intrinsic variations". Astronomy and Astrophysics. 498 (2): 627–640. arXiv:0901.0934. Bibcode:2009A&A...498..627F. doi:10.1051/0004-6361/200810698. S2CID 18739721.
  6. [6]
    Wu, Yue; et al. (2010). "Coudé-feed stellar spectral library – atmospheric parameters". Astronomy & Astrophysics. 525: A71. arXiv:1009.1491. Bibcode:2011A&A...525A..71W. doi:10.1051/0004-6361/201015014. S2CID 53480665.
  7. [7]
    "17 Aqr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved October 22, 2018.
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