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.