Theta Cassiopeiae

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θ Cassiopeiae
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cassiopeia
Right ascension 01h11m06.2s
Declination +55°08′59″
Apparent magnitude (V) +4.34
Distance 137 ± 4 ly
(42 ± 1 pc)
Spectral type A7V
Other designations
Marfak, 33 Cassiopeiae, HR 343, HD 6961, BD+54°236, HIP 5542, SAO 22070, GC 1424, CCDM J01112+5508
The Bayer-designated stars in Cassiopeia. Theta Cassiopeiae is circled.

Theta Cassiopeiae (θ Cas, θ Cassiopeiae) is a star in the constellation Cassiopeia. It has the traditional name Marfark or Marfak, which it shares with μ Cassiopeiae, and the name was from Al Marfik or Al Mirfaq (المرفق), meaning "the elbow".[1]

In Chinese, 閣道 (Gé Dào), meaning Flying Corridor, refers to an asterism consisting of θ Cassiopeiae, ι Cassiopeiae, ε Cassiopeiae, δ Cassiopeiae, ν Cassiopeiae and ο Cassiopeiae.[2] Consequently, θ Cassiopeiae itself is known as 閣道四 (Gé Dào sì, English: the Fourth Star of Flying Corridor.)[3]

θ Cassiopeiae is a white A-type main sequence dwarf with an apparent magnitude of +4.34. It is approximately 137 light years from Earth.


  1. ^ Allen, R. H. (1963). Star Names: Their Lore and Meaning (Reprint ed.). New York: Dover Publications Inc. p. 148. ISBN 0-486-21079-0. Retrieved 2010-12-12. 
  2. ^ (Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7.
  3. ^ (Chinese) 香港太空館 - 研究資源 - 亮星中英對照表, Hong Kong Space Museum. Accessed on line November 23, 2010.