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]
(7.08 + 15.11 + 7.90[3])
Characteristics
Evolutionary stage main sequence[3]
Spectral type F5.5V + M5V + F8V[3]
U−B color index +0.04[3]
+0.005 (Aa)[3]
+1.13 (Ab)[3]
+0.15 (B)[3]
B−V color index +0.514[3]
+0.459 (Aa)[3]
+1.701 (Ab)[3]
+0.642 (B)[3]
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)22.63 ± 0.25[3] mas
Distance144 ± 2 ly
(44.2 ± 0.5 pc)
Absolute magnitude (MV)3.45[2]
Orbit[3]
Primary24 Aqr A
Companion24 Aqr B
Period (P)48.98±0.07 yr
Semi-major axis (a)0.4250±0.0005″
Eccentricity (e)0.8610±0.0002
Inclination (i)55.00±0.04°
Longitude of the node (Ω)140.26±0.05°
Periastron epoch (T)2020.799±0.003
Argument of periastron (ω)
(secondary)		293.95±0.07°
Orbit[4]
Primary24 Aqr Aa
Companion24 Aqr Ab
Period (P)5.883933(15) days
Semi-major axis (a)0.0706±0.0019[3] AU
Eccentricity (e)0.071±0.006
Inclination (i)55.8±2.9[3]°
Periastron epoch (T)46,988.58±0.08 MJD
Argument of periastron (ω)
(secondary)		286±5°
Semi-amplitude (K1)
(primary)		14.60±0.09 km/s
Details[3]
24 Aqr Aa
Mass1.12±0.06 M☉
Radius1.23±0.04 R☉
Luminosity2.4±0.1 L☉
Surface gravity (log g)4.40±0.06 cgs
Temperature6,483±80 K
Metallicity [Fe/H]–0.09[5] dex
Age3.612 Gyr
24 Aqr Ab
Mass0.24±0.05 M☉
Radius0.28±0.04 R☉
Surface gravity (log g)4.80±0.06 cgs
Age3.612 Gyr
24 Aqr B
Mass1.06±0.05 M☉
Radius1.02±0.04 R☉
Luminosity1.33±0.05 L☉
Surface gravity (log g)4.47±0.06 cgs
Temperature6,150±80 K
Age3.612 Gyr
Other designations
24 Aqr, BD−00°4245, HD 206058, HIP 106942, SAO 145566, WDS J21395-0003, LTT 8626
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. Based on a dynamical parallax measurement,[3] the system is located at a distance of 144 light-years (44 parsecs). The system is moving closer to the Earth with a heliocentric radial velocity of −16 km/s.[2]

The components A and B make up a visual binary wiith an orbital period of 48.98 years and a high eccentricity of 0.8610.[6] Both are main sequence stars with spectral types of F5.5V and F8V, respectively. 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] being orbited by a faint red dwarf with a spectral type of M5V.[3]

References

  1. ↑ 1.0 1.1 1.2 1.3 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. ↑ 3.00 3.01 3.02 3.03 3.04 3.05 3.06 3.07 3.08 3.09 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 Abushattal, Ahmad A.; Al-Wardat, Mashhoor A.; Horch, Elliott P.; Georgakarakos, Nikolaos; Al-Ameryeen, Hatem A.; Abu-Alrob, Enas M.; Hussein, Abdallah M. (January 2024), "The 24 Aqr triple system: A closer look at its unique high-eccentricity hierarchical architecture" (in en), Advances in Space Research 73 (1): 1170–1184, doi:10.1016/j.asr.2023.10.044, ISSN 0273-1177, Bibcode: 2024AdSpR..73.1170A .
  4. ↑ 4.0 4.1 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. ↑ 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 .
  6. ↑ 6.0 6.1 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 .



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