Astronomy:24 Aquarii

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Short description: Star in the constellation Aquarius
24 Aquarii
Observation data
Equinox J2000.0]] (ICRS)
Constellation Aquarius
Right ascension  21h 39m 31.53468s[1]
Declination −00° 03′ 04.1095″[1]
Apparent magnitude (V) 6.66[2]
Characteristics
Spectral type F7 III[3] OR F7V + ? + F9V[4]
B−V color index +0.52[5]
Astrometry
Radial velocity (Rv)−15.86±0.06[2] km/s
Proper motion (μ) RA: +215.367[1] mas/yr
Dec.: +17.077[1] mas/yr
Parallax (π)25.0839 ± 0.6277[1] mas
Distance130 ± 3 ly
(39.9 ± 1.0 pc)
Absolute magnitude (MV)3.45[2]
Orbit[6]
Period (P)48.65 yr
Semi-major axis (a)0.448″
Eccentricity (e)0.868
Inclination (i)58.0°
Longitude of the node (Ω)139.3°
Periastron epoch (T)1971.55
Argument of periastron (ω)
(secondary)		293.0°
Details[7]
24 Aqr Aa
Mass1.25 M☉
Radius1.42+0.05
−0.08[1] R☉
Luminosity2.864±0.080[1] L☉
Temperature6,231 K
Metallicity [Fe/H]–0.09 dex
Age3.5 Gyr
Other designations
Database references
SIMBADdata

24 Aquarii is a triple star[6] system in the equatorial constellation of Aquarius. 24 Aquarii is the Flamsteed designation. The apparent magnitude of this system is 6.66,[2] which, according to the Bortle Dark-Sky Scale, means it is a faint star that is just visible to the naked eye from dark, rural skies. It has an annual parallax shift of 25.08 mas,[1] which is equivalent to a distance of 130 light-years (40 parsecs) from Earth. The system is moving closer to the Earth with a heliocentric radial velocity of −16 km/s.[2]

The calculated orbit of the visual binary has a period of 48.65 years and a large eccentricity of 0.868.[6] The primary, component A, is itself a single-lined spectroscopic binary with a period of 5.8839 days and an eccentricity of 0.071±0.006.[4] One study gives the system a stellar classification of F7 III,[3] suggesting it contains an evolved giant star. Other classifications give classes matching F-type main-sequence stars for components Aa and B.[4]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 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.  Gaia DR2 record for this source at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 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 Fehrenbach, C. (1966), "La mesure des vitesses radiales au prisme objectif XIX. Liste de 893 vitesses radiales determinees au prisme objectif a vision directe", Publications de l'Observatoire de Haute-Provence 8: 25, Bibcode: 1966POHP....8...25F .
  4. ↑ 4.0 4.1 4.2 Griffin, R. F. et al. (June 1996), "Spectroscopic binary orbits from photoelectric radial velocities. Paper 128: 24 Aquarii", The Observatory 116: 162–175, Bibcode: 1996Obs...116..162G .
  5. ↑ Cousins, A. W. J.; Stoy, R. H. (1962), "Photoelectric magnitudes and colours of Southern stars", Royal Observatory Bulletin 64: 103, Bibcode: 1962RGOB...64..103C .
  6. ↑ 6.0 6.1 6.2 Branham, Richard L. Jr. (March 2005), "Calculating the Apparent Orbit of a Double Star", The Astrophysical Journal 622 (1): 613–61, doi:10.1086/427870, Bibcode: 2005ApJ...622..613B .
  7. ↑ Casagrande, L. et al. (June 2011), "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey", Astronomy and Astrophysics 530: A138, doi:10.1051/0004-6361/201016276, Bibcode: 2011A&A...530A.138C .

External links



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