24 Aquarii

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24 Aquarii
Observation data
Epoch J2000       Equinox J2000
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  mas [3]
Distance 144 ± 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
Mass 1.12±0.06  M☉
Radius 1.23±0.04  R☉
Luminosity 2.4±0.1  L☉
Surface gravity (log g)4.40±0.06  cgs
Temperature 6,483±80  K
Metallicity [Fe/H]–0.09 [5]   dex
Age 3.612  Gyr
24 Aqr Ab
Mass 0.24±0.05  M☉
Radius 0.28±0.04  R☉
Surface gravity (log g)4.80±0.06  cgs
Age 3.612  Gyr
24 Aqr B
Mass 1.06±0.05  M☉
Radius 1.02±0.04  R☉
Luminosity 1.33±0.05  L☉
Surface gravity (log g)4.47±0.06  cgs
Temperature 6,150±80  K
Age 3.612  Gyr
Other designations
24 Aqr, BD−00°4245, HD 206058, HIP 106942, SAO 145566, WDS J21395-0003, LTT 8626
Database references
SIMBAD data

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 2 3 4 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 . Gaia DR2 record for this source at VizieR .
  2. 1 2 3 4 5 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 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 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", Advances in Space Research, 73 (1): 1170–1184, arXiv: 2512.23645 , Bibcode:2024AdSpR..73.1170A, doi:10.1016/j.asr.2023.10.044, ISSN   0273-1177 .
  4. 1 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. ↑ 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, arXiv: 1103.4651 , Bibcode:2011A&A...530A.138C, doi:10.1051/0004-6361/201016276, S2CID   56118016 .
  6. 1 2 Branham, Richard L. Jr. (March 2005), "Calculating the Apparent Orbit of a Double Star", The Astrophysical Journal, 622 (1): 613–61, Bibcode:2005ApJ...622..613B, doi: 10.1086/427870 .
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