Binary star system in the constellation Sagittarius
52 Sagittarii
Location of 52 Sagittarii (circled)
Observation dataEpoch J2000 Equinox J2000
Constellation
Sagittarius
Right ascension 19h 36m 42.43288s [ 1]
Declination
−24° 53′ 01.0288″[ 1]
Apparent magnitude (V)4.59[ 2]
Characteristics
Evolutionary stage
main sequence[ 3]
Spectral type
B8/9V[ 4]
U−B color index
−0.15[ 5]
B−V color index
−0.06[ 5]
Astrometry Radial velocity (Rv )−19.00[ 6] Proper motion (μ) RA: +68.30[ 1] mas /yr Dec.: −21.51[ 1] mas /yr Parallax (π)17.20 ± 0.23 mas [ 1] Distance 190 ± 3 ly pc ) Absolute magnitude (MV )0.77[ 2] Details 52 Sgr A Mass ± 0.1[ 7] M ☉ Radius 2.1[ 8] R ☉ Luminosity +1.9 [ 3] L ☉ Surface gravity (log g )4.19[ 9] cgs Temperature +74 [ 3] K Metallicity 0.00[ 10] dex Rotational velocity (v sin i )48[ 3] Age ± 11.7[ 7] Myr Other designations h2 Sgr ,
52 Sgr ,
NSV 12191,
CD −25°14184,
GC 27089,
HD 184707,
HIP 96465,
HR 7440,
SAO 188337,
CCDM J19367-2453AB,
WDS J19367-2453AB,
GSC 06893-02132[ 11] Database references SIMBAD data
52 Sagittarii is a binary star [ 12] constellation of Sagittarius . It has the Bayer designation h2 Sagittarii , while 52 Sagittarii is the Flamsteed designation . This system is visible to the naked eye as a faint, blue-white hued point of light with an apparent visual magnitude of 4.59.[ 2] parallax ,[ 1] radial velocity of −19 km/s.[ 6]
The primary component is a B-type main-sequence star with a stellar classification of B8/9V.[ 4] kB8 hB9 HeA0 Va (Sr Fe II) ,[ 13] calcium K line of a B8 class star, the hydrogen lines of a B9 star, and the helium lines of an A0 star, along with overabundances of strontium and iron. It is around 57[ 7] [ 7] mass of the Sun and about 2.1[ 8] Sun's radius . It is radiating 60.5[ 3] luminosity of the Sun from its photosphere at an effective temperature of 10,592 K.[ 3] projected rotational velocity of 48 km/s.[ 3]
52 Sagittarii has one companion at an angular separation of ″ [ 14] [ 15]
References
^ a b c d e f 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 ^ a b c 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 . Vizier catalog entry ^ a b c d e f g Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars". Astronomy & Astrophysics . 537 : A120. arXiv :1201.2052 Bibcode :2012A&A...537A.120Z . doi :10.1051/0004-6361/201117691 . S2CID 55586789 . Vizier catalog entry ^ a b Houk, Nancy; Smith-Moore, M. (1978). Michigan catalogue of two-dimensional spectral types for the HD stars . Vol. 4. Ann Arbor: Dept. of Astronomy, University of Michigan. Bibcode :1988mcts.book.....H . ^ a b Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers . 42 (2): 443. Bibcode :2014JAVSO..42..443M . Vizier catalog entry ^ a b Wilson, R. E. (1953). "General Catalogue of Stellar Radial Velocities". Carnegie Institute Washington D.C. Publication . Carnegie Institution for Science . Bibcode :1953GCRV..C......0W . LCCN 54001336 . ^ a b c d Tetzlaff, N.; et al. (2011). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun" . Monthly Notices of the Royal Astronomical Society . 410 (1): 190– 200. arXiv :1007.4883 Bibcode :2011MNRAS.410..190T . doi :10.1111/j.1365-2966.2010.17434.x S2CID 118629873 . Vizier catalog entry ^ a b Allende Prieto, C.; Lambert, D. L. (1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: Masses, radii and effective temperatures". Astronomy and Astrophysics . 352 : 555– 562. arXiv :astro-ph/9911002 Bibcode :1999A&A...352..555A . Vizier catalog entry ^ David, Trevor J.; Hillenbrand, Lynne A. (2015). "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal . 804 (2): 146. arXiv :1501.03154 Bibcode :2015ApJ...804..146D . doi :10.1088/0004-637X/804/2/146 . S2CID 33401607 . Vizier catalog entry ^ Gontcharov, G. A. (2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters . 38 (12): 771– 782. arXiv :1606.08814 Bibcode :2012AstL...38..771G . doi :10.1134/S1063773712120031 . S2CID 118345778 . Vizier catalog entry ^ "h02 Sgr" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved 2019-07-27 .^ Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems" . Monthly Notices of the Royal Astronomical Society 389 (2): 869– 879. arXiv :0806.2878 Bibcode :2008MNRAS.389..869E . doi :10.1111/j.1365-2966.2008.13596.x S2CID 14878976 . ^ Garrison, R. F.; Gray, R. O. (1994). "The late B-type stars: Refined MK classification, confrontation with stromgren photometry, and the effects of rotation". The Astronomical Journal . 107 : 1556. Bibcode :1994AJ....107.1556G . doi :10.1086/116967 . ^ Hubrig, S.; et al. (2007). "Establishing the nature of companion candidates to X-ray-emitting late B-type stars" . Monthly Notices of the Royal Astronomical Society . 381 (4): 1569. arXiv :0708.0860 Bibcode :2007MNRAS.381.1569H . doi :10.1111/j.1365-2966.2007.12325.x S2CID 15143368 . ^ Mason, Brian D.; et al. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog" . The Astronomical Journal . 122 (6): 3466. Bibcode :2001AJ....122.3466M . doi :10.1086/323920 Vizier catalog entry
