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Arrakis, Errakis, Mu Draconis, 21 Draconis

Proper NamesAlrakis, Arrakis, Errakis
Bayer DesignationMu Draconis
Flamsteed Number21 Draconis
HR (BSC)6370
Right Ascension17h 5m 20s
Declination+54° 28' 12"
Distance89 light years
27 parsecs
MagnitudeApparent: +4.9
Absolute: +2.8
Spectral ClassF7 Bright Yellow Dwarf
Optimum VisibilityJune (Usually visible from northern latitudes)
NotesThe heart of the Alrakis system consists of two yellow-white stars orbiting one another at a distance of about 90 AU, a mutual orbit that take nearly seven centuries to complete.

Imagery provided by Aladin sky atlas

Image of Alrakis

The view from a hypothetical planet in the Alrakis system. Bright in the sky are the twin stars that make up the core of the system. The third and more distant component, Alrakis C, shines like a 'morning star'.

The name Alrakis (or commonly Arrakis) comes from Arabic, and means 'The Dancer'. This is indeed an appropriate name for a three-star system, where the two major components are almost identical stars rotating around their common centre of gravity. A third, fainter, star pursues a more distant orbit around these two.


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