Mu2 Scorpii

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μ2 Scorpii
Observation data
Epoch J2000      Equinox J2000
Constellation Scorpius
Right ascension 16h 52m 20.14532s[1]
Declination −38° 01′ 03.1258″[1]
Apparent magnitude (V) +3.56[2]
Spectral type B2 IV[3]
U−B color index −0.878[2]
B−V color index −0.219[2]
Radial velocity (Rv) +1.4[4] km/s
Proper motion (μ) RA: −11.09[1] mas/yr
Dec.: −23.32[1] mas/yr
Parallax (π) 6.88 ± 0.12[1] mas
Distance 474 ± 8 ly
(145 ± 3 pc)
Mass 8.7±0.2[5] M
Radius 7.0[6] R
Luminosity 2,385[7] L
Temperature 23,113[6] K
Rotational velocity (v sin i) 58[8] km/s
Age 18.5±3.2[5] Myr
Other designations
μ2 Scorpii, CD−37° 11037, HD 151985, HIP 82545, HR 6252, SAO 208116.[9]
Database references

Mu2 Scorpii2 Sco, μ2 Scorpii) is a star in the zodiac constellation of Scorpius. It has an apparent visual magnitude of +3.56,[2] which is bright enough to be seen with the naked eye. The distance to μ2 Sco is about 474 light years, as determined by parallax measurements.[1]

This is a blue-white, B-type subgiant star with a stellar classification of B2 IV.[3] It has an estimated 7 times the radius of the Sun, almost 9 times the Sun's radius,[5] and shines with 2,385 times the Sun's luminosity.[7] The outer atmosphere has an effective temperature of 23,113 K.[6] It is some 18.5[5] million years old and is spinning with a projected rotational velocity of 58 km/s.[8] μ2 Sco is a member of the Upper Centaurus-Lupus subgroup of the Scorpius–Centaurus Association.[10]

In Chinese astronomy, Mu2 Scorpii is called 神宮, Pinyin: Shéngōng, meaning Changing Room, because this star is marking itself and stand alone in Changing Room asterism, Tail mansion (see : Chinese constellation).[11] 神宮 (Shéngōng), westernized into Shing Kung, but the name Shing Kung was designated for the formation was applied to the stars of the tail (of Scorpio) by R.H. Allen and the meaning is "a Divine Temple."[12]


  1. ^ a b c d e f van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752Freely accessible, doi:10.1051/0004-6361:20078357. 
  2. ^ a b c d Gutierrez-Moreno, Adelina; Moreno, Hugo (June 1968), "A photometric investigation of the Scorpio-Centaurus association", Astrophysical Journal Supplement, 15: 459, Bibcode:1968ApJS...15..459G, doi:10.1086/190168. 
  3. ^ a b Hiltner, W. A.; et al. (July 1969), "MK Spectral Types for Bright Southern OB Stars", The Astrophysical Journal, 157: 313, Bibcode:1969ApJ...157..313H, doi:10.1086/150069. 
  4. ^ Evans, D. S. (June 20–24, 1966), Batten, Alan Henry; Heard, John Frederick, eds., "The Revision of the General Catalogue of Radial Velocities", Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30, University of Toronto: International Astronomical Union, Bibcode:1967IAUS...30...57E. 
  5. ^ 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: 190–200, Bibcode:2011MNRAS.410..190T, arXiv:1007.4883Freely accessible, doi:10.1111/j.1365-2966.2010.17434.x. 
  6. ^ a b c Underhill, A. B.; et al. (November 1979), "Effective temperatures, angular diameters, distances and linear radii for 160 O and B stars", Monthly Notices of the Royal Astronomical Society, 189: 601–605, Bibcode:1979MNRAS.189..601U, doi:10.1093/mnras/189.3.601. 
  7. ^ a b McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, Bibcode:2012MNRAS.427..343M, arXiv:1208.2037Freely accessible, doi:10.1111/j.1365-2966.2012.21873.x. 
  8. ^ a b Uesugi, Akira; Fukuda, Ichiro (1970), "Catalogue of rotational velocities of the stars", Contributions from the Institute of Astrophysics and Kwasan Observatory, University of Kyoto, 
  9. ^ "mu.02 Sco -- Variable Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2016-09-20. 
  10. ^ Bobylev, V. V.; Bajkova, A. T. (September 2007), "Kinematics of the Scorpius-Centaurus OB association", Astronomy Letters, 33 (9): 571–583, Bibcode:2007AstL...33..571B, doi:10.1134/S1063773707090010. 
  11. ^ (Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 10 日
  12. ^ Allen, Richard Hinckley (1899), "Scorpio", Star-Names and Their Meanings (1963 Dover reprint ed.), New York: G.E. Stechert, 1899, retrieved 2016-09-22.