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Mu Draconis: Wikis

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Mu Draconis
Observation data
Epoch J2000      Equinox J2000
Constellation Draco
Right ascension 17h 05m 19.7s
Declination +54° 28′ 13″
Apparent magnitude (V) 5.8 / 5.61
Spectral type F7V
U-B color index 0.05
B-V color index 0.48
Variable type -
Radial velocity (Rv) −4.5 km/s
Proper motion (μ) RA: −68.4 mas/yr
Dec.: 88.7 mas/yr
Parallax (π) 37.08 ± 0.89 mas
Distance 88 ± 2 ly
(27 ± 0.6 pc)
Absolute magnitude (MV) ?
Companion HIP 83608
Period (P) ? yr
Semimajor axis (a) ?"
Eccentricity (e) ?
Inclination (i)
Longitude of the node (Ω)
Periastron epoch (T) ?
Other designations
Alrakis, 21 Draconis (21 Dra), HR 6370, BD +54°1857, HD 154906, SAO 30239, HIP 83608.

Mu Draconis (μ Draconis / μ Dra) is a 5th-magnitude star near the head of the constellation Draco.

Mu Draconis is also known by its older name name Alrakis,[1] [2] which is derived from name given to it in Arabic by Arabian stargazers, al-Rāqiṣ, "the Trotting Camel"[1][3] or "the Dancer."[2][3] This name is also sometimes spelled in the English as "Arrakis" or "Errakis."[3]

Science fiction writer Frank Herbert chose Arrakis as the name of the primary planet in his famous Dune series of novels, aware that the word "Arrakis" is the transliteration into English of the Arabic words for "the dancer" (al-Raqis).[citation needed]

Mu Draconis, the Binary Star

Mu Draconis is a binary star.[citation needed] Each component star is of the spectral class F7V and the visual magnitude of 5.8m. Their combined magnitude is 4.92m. Mu Draconis is located approximately 85 light years from the Solar System, and reportedly consists of two nearly-identical yellow-white stars in a close orbit about each other.


  1. ^ a b Kunitzsch, P., & Smart, T., (2006). A Dictionary of Modern star Names: A Short Guide to 254 Star Names and Their Derivations (2nd rev. ed.). Cambridge, MA: Sky Pub. p. 35. ISBN 9781931559447. 
  2. ^ a b Davis, Jr., G. A., (1971). Pronunciations, Derivations, and Meanings of a Selected List of Star Names (rep. ed.). Cambridge, MA: Sky Pub. Corp. p. 13. 
  3. ^ a b c Allen, R. H., (1963). Star Names: Their Lore and Meaning (rep. ed.). New York, NY: Dover Publications Inc.. p. 211. ISBN 0486210790. 

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