17 Aquarii

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17 Aquarii
Observation data
Epoch J2000       Equinox J2000
Constellation Aquarius
Right ascension 21h 22m 56.25866s [1]
Declination −09° 19′ 09.5823″ [1]
Apparent magnitude  (V)5.99 [2]
Characteristics
Spectral type K4/5 III [3]
B−V color index 1.516±0.008 [2]
Astrometry
Radial velocity (Rv)18.2±2.9 [4] km/s
Proper motion (μ)RA: −29.659 [1] mas/yr
Dec.: −29.022 [1] mas/yr
Parallax (π)4.9125±0.1260  mas [1]
Distance 660 ± 20  ly
(204 ± 5  pc)
Absolute magnitude  (MV)−0.73 [2]
Orbit [5]
Period (P)7,290 d
Eccentricity (e)0.4
Details
17 Aqr A
Luminosity 495.46 [2]   L☉
Surface gravity (log g)1.74±0.14 [6]   cgs
Temperature 3,951±14 [6]   K
Metallicity [Fe/H]−0.10±0.06 [6]   dex
Other designations
17 Aqr, BD−09°5728, FK5 3705, HD 203525, HIP 105574, HR 8175, SAO 145351 [7]
Database references
SIMBAD data

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]

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 2 3 4 5 6 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. 1 2 3 4 5 6 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. 1 2 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. 1 2 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. 1 2 3 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. 1 2 3 4 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. ↑ "17 Aqr". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved October 22, 2018.
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