Mizar an Alcor

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Mizar
Mizar an Alcor in constellation Ursa Major
Mizar an Alcor in constellation Ursa Major
Observation data
Epoch J2000      Equinox J2000
Constellation Ursa Major
Richt ascension 13h 23m 55.5s[1]
Declination +54° 55′ 31″[1]
Apparent magnitude (V) 2.27[1]
Chairactereestics
Spectral type A2Vp/A2Vp/A1m/A5V[2]
B−V colour index 0.02[1]
Astrometry
Radial velocity (Rv)−6.31[1] km/s
Proper motion (μ) RA: 119.01[1] mas/yr
Dec.: −25.97[1] mas/yr
Parallax (π)38.01 ± 1.71[1] mas
Distance86 ± 4 ly
(26 ± 1 pc)
Absolute magnitude (MV)0.33
Ither designations
Mizat, Mirza, Mitsar, Vasistha, ζ Ursae Majoris, ζ UMa, Zeta UMa, 79 Ursae Majoris, BD+55 1598A, CCDM J13240+5456AB, FK5 497, GC 18133, HD 116656, HIP 65378, HR 5054, PPM 34007, SAO 28737, WDS J13239+5456Aa,Ab.
Database references
SIMBADdata
Alcor
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Ursa Major
Richt ascension 13h 25m 13.5s[1]
Declination +54° 59′ 17″[1]
Apparent magnitude (V) +3.99[3]
Absolute magnitude (V)+2.00[3]
Distance81.7 ± 0.2[citation needit] ly
(25.1 ± 0.08[citation needit] pc)
Spectral teepA5Vn / M[3]
Ither designations
Saidak, Suha, Arundhati, g Ursae Majoris, 80 Ursae Majoris, BD+55 1603, CCDM J13240+5456D, GC 18155, HD 116842, HIP 65477, HR 5062, PPM 34021, SAO 28751, WDS J13239+5456Ca,Cb.
Database references
SIMBADdata

Mizar an Alcor form a nakit-ee dooble starn in the haundle o the Big Dipper asterism in the constellation Ursa Major. Mizar is itsel a quadruple seestem an Alcor is a binary, the pair thegither formin a sextuple seestem.

References[eedit | eedit soorce]

  1. 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 van Leeuwen, F. (November 2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. 
  2. Eggleton, P. P.; Tokovinin, A. A. (2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869. arXiv:0806.2878Freely accessible. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. 
  3. 3.0 3.1 3.2 Mamajek, Eric E.; Kenworthy, Matthew A.; Hinz, Philip M.; Meyer, Michael R. (2010). "Discovery of a Faint Companion to Alcor Using MMT/AO 5 μm Imaging". The Astronomical Journal. 139 (3): 919–925. arXiv:0911.5028Freely accessible. Bibcode:2010AJ....139..919M. doi:10.1088/0004-6256/139/3/919. 

Coordinates: Sky map 13h 23m 55.5s, +54° 55′ 31″