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HD 224635 and HD 224636

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HD 224635/HD 224636
Observation data
Epoch J2000      Equinox ICRS
Constellation Andromeda[1]
HD 224635
Right ascension 23h 59m 29.2915s[2]
Declination +33° 43′ 25.8773″[2]
Apparent magnitude (V) 6.46[3]
HD 224636
Right ascension 23h 59m 29.2054s[4]
Declination +33° 43′ 27.6539″[4]
Apparent magnitude (V) 6.72[3]
Characteristics
HD 224635
Evolutionary stage main sequence[2]
Spectral type F8[5]
B−V color index 0.51[6]
HD 224636
Evolutionary stage main sequence[4]
Spectral type G1[5]
B−V color index 0.55[6]
Astrometry
Radial velocity (Rv)−7.90±0.2[7] km/s
Proper motion (μ) RA: −59.68±0.65[8] mas/yr
Dec.: −113.19±0.35[8] mas/yr
Parallax (π)34.57±0.51 mas[8]
Distance94 ± 1 ly
(28.9 ± 0.4 pc)
Absolute magnitude (MV)+3.5[1]
Orbit[9]
Period (P)1,224±320 yr
Semi-major axis (a)5.048±0.849″
Eccentricity (e)0.449±0.066
Inclination (i)58.9±1.0°
Longitude of the node (Ω)4.8±1.4°
Periastron epoch (T)1973±12
Argument of periastron (ω)
(secondary)		282±10°
Details
HD 224635
Mass1.19[10] M☉
Radius1.20[11] R☉
Luminosity1.90[11] L☉
Surface gravity (log g)4.36[11] cgs
Temperature6,191[11] K
Metallicity−0.070[12]
Age1.42[13] Gyr
HD 224636
Mass1.13[10] M☉
Radius1.15[11] R☉
Luminosity1.58[11] L☉
Surface gravity (log g)4.36[11] cgs
Temperature6,023[11] K
Metallicity−0.070[12]
Age1.46[13] Gyr
Other designations
BD+32 4747, HIP 118281, SAO 73656, ADS 17149, WDS J23595+3343
HD 224635: HR 9074
HD 224636: HR 9075
Database references
SIMBADHD 224635
HD 224636

HD 224635 and HD 224636 is a pair of stars comprising a binary star system in the constellation Andromeda. They are located approximately 94 light years away[8] and they orbit each other every 1,200 years.[9]

The primary star is HD 224635, a magnitude 6.46[3] star (making it visible by the naked eye under very favourable conditions) with a spectral type F8[5] that is 1.19 times more massive than the Sun.[10]

The secondary star is the slightly fainter HD 224636, with an apparent visual magnitude of 6.72,[3] a spectral type G1,[5] and 1.13 times more massive than the Sun.[10]

References

[edit]
  1. 1 2 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. XHIP record for this object at VizieR.
  2. 1 2 3 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.
  3. 1 2 3 4 Malkov, O. Yu.; et al. (2012), "Dynamical Masses of a Selected Sample of Orbital Binaries", Astronomy & Astrophysics, 546: 5, Bibcode:2012A&A...546A..69M, doi:10.1051/0004-6361/201219774, A69
  4. 1 2 3 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.
  5. 1 2 3 4 Struve, Otto; Franklin, K. L. (1955). "Spectrographic Observations of Visual Double Stars". The Astrophysical Journal. 121: 337. Bibcode:1955ApJ...121..337S. doi:10.1086/145993.
  6. 1 2 Fabricius, C.; Høg, E.; Makarov, V. V.; Mason, B. D.; Wycoff, G. L.; Urban, S. E. (2002). "The Tycho double star catalogue". Astronomy and Astrophysics. 384: 180–189. Bibcode:2002A&A...384..180F. doi:10.1051/0004-6361:20011822.
  7. ↑ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
  8. 1 2 3 4 van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
  9. 1 2 Kiyaeva, O. V.; Izmailov, I. S. (December 2025). "A Comparison of Three Approaches to Determining Orbits of Visual Double Stars Based on Observations of Their Short-Arced Orbits". Astronomy Reports. 69 (12): 1315–1325. Bibcode:2025ARep...69.1315K. doi:10.1134/S1063772925702415. ISSN 1063-7729.
  10. 1 2 3 4 Tokovinin, Andrei (2014). "From Binaries to Multiples. II. Hierarchical Multiplicity of F and G Dwarfs". The Astronomical Journal. 147 (4): 14. arXiv:1401.6827. Bibcode:2014AJ....147...87T. doi:10.1088/0004-6256/147/4/87. S2CID 56066740. 87.
  11. 1 2 3 4 5 6 7 8 Stassun, Keivan G.; et al. (2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467.
  12. 1 2 Soubiran, Caroline; et al. (2016), "The PASTEL catalogue: 2016 version", Astronomy & Astrophysics, 591: A118, arXiv:1605.07384, Bibcode:2016A&A...591A.118S, doi:10.1051/0004-6361/201628497, S2CID 119258214.
  13. 1 2 Luck, R. Earle (2017). "Abundances in the Local Region II: F, G, and K Dwarfs and Subgiants". The Astronomical Journal. 153 (1): 21. arXiv:1611.02897. Bibcode:2017AJ....153...21L. doi:10.3847/1538-3881/153/1/21.


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