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Yildun

Pherkard, Delta Ursae Minoris, 23 Ursae Minoris

Proper NamesYildun, Pherkard
Bayer DesignationDelta Ursae Minoris
Flamsteed Number23 Ursae Minoris
HR (BSC)6789
HD166205
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)

A white, A-type star lying more than 170 light years from the Sun. After Polaris, this is one of the closest 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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