36 Andromedae Binary star system in the constellation Andromeda
36 Andromedae
Location of 36 Andromedae (circled)
Observation dataEpoch J2000 Equinox ICRS
Constellation Andromeda
36 Andromedae A
Right ascension 00h 54m 58.25579s [ 1]
Declination +23° 37′ 41.3002″ [ 1]
Apparent magnitude (V)6.12[ 2] [ 3]
36 Andromedae B
Right ascension 00h 54m 58.21490s [ 4]
Declination +23° 37′ 42.2805″ [ 1]
Apparent magnitude (V)6.54[ 2]
Characteristics
Spectral type G8 IV + K3 IV [ 5]
B−V color index
± 0.010[ 6]
Astrometry Radial velocity (Rv )± 0.12[ 7] km/s Proper motion (μ) RA: ± 1.00 mas /yr [ 8] Dec.: ± 0.48 mas /yr [ 8] Parallax (π)26.33± 0.65 mas [ 8] Distance 124 ± 3 ly pc ) Absolute magnitude (MV )2.56[ 6] Orbit [ 9] Primary 36 And A Name 36 And B Period (P)± 0.37 yr Semi-major axis (a)″ ± 0.0017″ AU )[ a] Eccentricity (e)± 0.0014Inclination (i)± 0.18° Longitude of the node (Ω)± 0.32° Periastron epoch (T)± 0.17Argument of periastron (ω)± 0.6° Details 36 And A Mass 1.45[ 10] M ☉ Radius 3.71[ 11] R ☉ Luminosity 7.75[ 11] L ☉ Temperature 5,000[ 11] K 36 And B Mass 1.34[ 10] M ☉ Other designations 36 And , NSV 343BD +22°146HD 5286HIP 4288HR 258SAO 74359PPM 90284ADS 755WDS J00550+2338AB[ 12] Database references SIMBAD system 36 Andromedae A 36 Andromedae B
36 Andromedae is a binary star system in the northern constellation of Andromeda , which is part of a triple star system.[ 10] designation is from the star catalogue of English astronomer John Flamsteed , first published in 1712. It is faintly visible to the naked eye with an apparent visual magnitude of 5.45.[ 3] parallax shift of 26.33 mas yields a distance estimate of about 124 light years . The system is moving closer to the Sun with a radial velocity of −0.8 km/s.[ 7]
Characteristics
The binary nature of 36 Andromedae was discovered in 1832 by the German-Russian astronomer Wilhelm von Struve .[ 5] orbital period of 169.1 years and an eccentricity of 0.31. Their semi-major axis is of 37 astronomical units (au), larger than that of Neptune .[ 9] [ a] angular separation of 0.90 arc seconds along a position angle of 330°.[ 2]
The primary, component A, is a magnitude 6.12[ 2] G-type star with a stellar classification of G8 IV,[ 5] [ 2] K-type star of class K3 IV.[ 5] evolving subgiant stars . However, at least one of the components is subject to flare activity, which may suggest they are instead pre-main sequence stars .[ 5]
36 Andromedae makes part of a triple star system. A third star, which shares a common proper motion with the inner pair and hence is believed to form a triple system, is separated by the AB pair by 1,407" (0.39°). At the system's distance, this implies a projected separation of astronomical units0.84 light-years)[ b] K-type main-sequence star with 0.68 times the mass of the Sun and an apparent magnitude of 10.92.[ 10]
Notes
1 2 Calculated from angular separation of ″ [ 9] parsecs .[ 8] ↑ Calculated from angular separation of ″ [ 10] parsecs .[ 8]
References
1 2 3 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties" . Astronomy and Astrophysics . 674 : A1. arXiv :2208.00211 Bibcode :2023A& A...674A...1G . doi :10.1051/0004-6361/202243940 S2CID 244398875 . Gaia DR3 record for this source at VizieR .1 2 3 4 5 Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal , 122 (6): 3466– 3471, Bibcode :2001AJ....122.3466M , doi :10.1086/323920 1 2 Ducati, J. R. (2002), "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system", CDS/ADC Collection of Electronic Catalogues , 2237 , Bibcode :2002yCat.2237....0D . ↑ Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties" . Astronomy and Astrophysics . 674 : A1. arXiv :2208.00211 Bibcode :2023A& A...674A...1G . doi :10.1051/0004-6361/202243940 S2CID 244398875 . Gaia DR3 record for this source at VizieR .1 2 3 4 5 Tamazian, V. S.; et al. (November 2000), "Spectral, photometric and speckle observations of visual binary WDS 00550+2338", Astronomy and Astrophysics , 363 : 1019−1025, Bibcode :2000A& A...363.1019T . 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 , S2CID 119257644 . 1 2 Famaey, B.; et al. (2005). "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters". Astronomy and Astrophysics . 430 : 165– 186. arXiv :astro-ph/0409579 Bibcode :2005A& A...430..165F . doi :10.1051/0004-6361:20041272 . S2CID 17804304 . 1 2 3 4 5 van Leeuwen, F. (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 . Vizier catalog entry 1 2 3 Izmailov, Igor; Khovritchev, Maxim (January 2025), "New Orbital Parameters of 850 Wide Visual Binary Stars and Their Statistical Properties", Research in Astronomy and Astrophysics , 25 (1): 015016, Bibcode :2025RAA....25a5016I , doi :10.1088/1674-4527/ad9da3 , ISSN 1674-4527 36 Andromedae's database entry at VizieR .1 2 3 4 5 Tokovinin, Andrei (2018-03-01). "The Updated Multiple Star Catalog" . The Astrophysical Journal Supplement Series . 235 (1): 6. arXiv :1712.04750 Bibcode :2018ApJS..235....6T . doi :10.3847/1538-4365/aaa1a5 ISSN 0067-0049 . 36 Andromedae's database entry at VizieR .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 .↑ "36 And" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved 2018-02-02 .
