Back Atlas (Stern) ALS أطلس (نجم) Arabic Atles (estrella) AST Atles (estrella) Catalan HD23850 CE Atlas (Stern) German Άτλας (αστέρας) Greek Atlas (estrella) Spanish ستاره اطلس Persian Atlas (étoile) French

Atlas (star)

Atlas
Image of the Pleiades star cluster
Atlas in the Pleiades cluster (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Taurus
Right ascension 03h 49m 09.74258s[1]
Declination +24° 03′ 12.3003″[1]
Apparent magnitude (V) 3.63[2] (3.84 / 5.46)[3]
Characteristics
Spectral type B8III[4]
U−B color index −0.36[5]
B−V color index −0.08[5]
Variable type SPB[6]
Astrometry
Radial velocity (Rv)8.5±2[7] km/s
Proper motion (μ) RA: +19.079 mas/yr[1]
Dec.: −46.193 mas/yr[1]
Parallax (π)8.1184 ± 0.4791 mas[1]
Distance431 ± 13 ly
(132±4[8] pc)
Absolute magnitude (MV)−1.82[9]
Orbit[8]
PrimaryAa1
CompanionAa2
Period (P)290.984±0.079 d
Semi-major axis (a)13.08±0.12 mas
Eccentricity (e)0.2385±0.0063
Inclination (i)107.87±0.49°
Longitude of the node (Ω)154.0±0.7°
Periastron epoch (T)JD 2450583.0±1.9
Argument of periastron (ω)
(secondary)		151.9±2.2°
Semi-amplitude (K1)
(primary)		26.55±1.41 km/s
Semi-amplitude (K2)
(secondary)		36.89±0.22 km/s
Details
Aa1
Mass4.74±0.25[8] M☉
Radius5.98±0.67[10] R☉
Surface gravity (log g)3.5±0.25[10] cgs
Temperature13500±300[10] K
Rotational velocity (v sin i)182[10] km/s
Aa2
Mass3.42±0.25[8] M☉
Radius3.2[11] R☉
Surface gravity (log g)3.96±0.09[11] cgs
Temperature13,660[11] K
Ab
Mass2.09[12] M☉
Other designations
27 Tau, BD+23°557, FK5 142, HD 23850, HIP 17847, HR 1178, SAO 76228
Database references
SIMBADdata

Atlas /ˈætləs/,[13] designation 27 Tauri, is a triple star system in the constellation of Taurus. It is a member of the Pleiades, an open star cluster (M45). It is 431 light-years (132 parsecs) away,[8] and is 3.92 degrees north of the ecliptic.

  1. ^ a b c d Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  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.
  3. ^ "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Archived from the original on 1 August 2017. Retrieved 21 June 2017.
  4. ^ 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.
  5. ^ a b Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
  6. ^ "NSV 1345". The International Variable Star Index. AAVSO. Retrieved 8 October 2022.
  7. ^ Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Washington. Bibcode:1953GCRV..C......0W.
  8. ^ a b c d e Zwahlen, N.; North, P.; Debernardi, Y.; Eyer, L.; Galland, F.; Groenewegen, M. A. T.; Hummel, C. A. (2004). "A purely geometric distance to the binary star Atlas, a member of the Pleiades". Astronomy & Astrophysics. 425 (3): L45. arXiv:astro-ph/0408430. Bibcode:2004A&A...425L..45Z. doi:10.1051/0004-6361:200400062. S2CID 37047575.
  9. ^ 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.
  10. ^ a b c d Gordon, Kathryn D.; Gies, Douglas R.; Schaefer, Gail H.; Huber, Daniel; Ireland, Michael (2019). "Angular Sizes, Radii, and Effective Temperatures of B-type Stars from Optical Interferometry with the CHARA Array". The Astrophysical Journal. 873 (1): 91. Bibcode:2019ApJ...873...91G. doi:10.3847/1538-4357/ab04b2. S2CID 125181833.
  11. ^ a b c Cite error: The named reference WhiteMNRAS471 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference msc was invoked but never defined (see the help page).
  13. ^ Kunitzsch, Paul; Smart, Tim (2006). A Dictionary of Modern star Names: A Short Guide to 254 Star Names and Their Derivations (2nd rev. ed.). Cambridge, Massachusetts: Sky Pub. ISBN 978-1-931559-44-7.

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