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Alpha Ursae Minoris Polaris as seen by the Hubble Space Telescope. Observation data Epoch J2000      Equinox J2000 Constellation Ursa Minor Right ascension 02h 31m 49.09s Declination +89° 15' 50.8? Apparent magnitude (V) 1.97 Characteristics Spectral type F7 Ib-II SB U-B color index 0.38 B-V color index 0.60 Variable type Cepheid variable Astrometry Radial velocity (Rv) -17 km/s Proper motion (µ) RA: 44.48 ± 0.11 mas/yr Dec.: -11.85 ± 0.13 mas/yr Parallax (p) 7.54 ± 0.11 mas Distance 433 ± 6 ly (133 ± 2 pc) Absolute magnitude (MV) -3.63±0.14 Details Mass 7.54±0.6 M? Radius 30 R? Luminosity 2200 L? Temperature 7200 K Metallicity 112% solar Rotation ~17 km/s Age ? years Other designations Polaris (a UMi, a Ursae Minoris, Alpha Ursae Minoris, commonly North(ern) Star or Pole Star, also Lodestar) is the brightest star in the constellation Ursa Minor. It is very close to the north celestial pole, making it the current northern pole star.Polaris is about 434 light-years from Earth and is a multiple star. It consists of the main star a UMi A, two smaller companions, a UMi B and a UMi Ab, and two distant components a UMi C and a UMi D. a UMi B was discovered in 1780 by William Herschel. Cite error: There are tags on this page, but the references will not show without a {{Reflist}} template or a tag; see the help page.
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