Astronomy:17 Aquarii

From HandWiki
Short description: Star in the constellation Aquarius
17 Aquarii
Observation data
Equinox J2000.0]] (ICRS)
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[1] mas
Distance660 ± 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
Luminosity495.46[2] L☉
Surface gravity (log g)1.74±0.14[6] cgs
Temperature3,951±14[6] K
Metallicity [Fe/H]−0.10±0.06[6] dex
Other designations
BD−09° 5728, FK5 3705, HD 203525, HIP 105574, HR 8175, SAO 145351[7]
Database references
SIMBADdata

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. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A. 
  3. ↑ 3.0 3.1 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. ↑ 4.0 4.1 Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. doi:10.1134/S1063773706110065. Bibcode: 2006AstL...32..759G. 
  5. ↑ 5.0 5.1 5.2 Famaey, B. et al. (2009). "Spectroscopic binaries among Hipparcos M giants,. I. Data, orbits, and intrinsic variations". Astronomy and Astrophysics 498 (2): 627–640. doi:10.1051/0004-6361/200810698. Bibcode: 2009A&A...498..627F. 
  6. ↑ 6.0 6.1 6.2 6.3 Wu, Yue et al. (2010). "Coudé-feed stellar spectral library – atmospheric parameters". Astronomy & Astrophysics 525: A71. doi:10.1051/0004-6361/201015014. Bibcode: 2011A&A...525A..71W. 
  7. ↑ "17 Aqr". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=17+Aqr. 



Retrieved from "https://handwiki.org/wiki/index.php?title=Astronomy:17_Aquarii&oldid=3670715"