Alpha Ursae Minoris

Polaris as seen by the Hubble Space Telescope.
Observation data
Epoch J2000      Equinox J2000
Constellation Ursa Minor
Right ascension 02
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
Parallax (π) 7.54 ± 0.11mas
Distance 433 ± 6 ly
(133 ± 2 pc)
Absolute magnitude (MV) -3.63±0.14
Details
Mass 7.54 ± 0.6M
Radius 46 ± 3R
Luminosity 2200 L
Temperature 7200 K
Metallicity 112% solar
Rotation ~17 km/s
Age ? years
Other designations
Polaris, Cynosura, Alruccabah, Phoenice, Navigatoria, Star of Arcady, Yilduz, Mismar, Поля́рная звезда́ (Polyarnaya zvyezda), 1 Ursae Minoris, HR 424, BD +88°8, HD 8890, SAO 308, FK5 907, GC 2243, ADS 1477, CCDM 02319+8915, HIP 11767

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This article uses material from the Wikipedia article
Polaris, which is released under the Creative Commons Attribution-Share-Alike License 3.0