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Pherkard, Delta Ursae Minoris, 23 Ursae Minoris

Proper NamesYildun, Pherkard
Bayer DesignationDelta Ursae Minoris
Flamsteed Number23 Ursae Minoris
HR (BSC)6789
ConstellationUrsa Minor
Right Ascension17h 32m 13s
Declination+86° 35' 11"
Distance172 light years
53 parsecs
MagnitudeApparent: +4.3
Absolute: +0.7
Spectral ClassA1Vn white main sequence star
Optimum VisibilityJune / July (Usually visible from northern latitudes)
NotesA white main sequence star with no known companions, fourth magnitude Yildun is unremarkable in stellar terms. Probably its most notable feature is the fact that it lies just 3½° from the Northern Celestial Pole in the skies of Earth, placing it very close to the brighter Pole Star, Polaris.

A white, A-type star lying more than 170 light years from the Sun. After Polaris, this is one of the closest named stars to the Northern Celestial Pole.

Image of Yildun

A close-up view of Yildun in Ursa Minor. Matter thrown outward from the star's photosphere forms loops and fan shapes ('prominences') thousands of miles across.


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