Quadrans Muralis

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The obsolete constellation Quadrans Muralis was composed of the faint stars above Boötes.
Map of the obsolete constellation Quadrans Muralis.

Quadrans Muralis (Latin for mural quadrant) was a constellation created by the French astronomer Jérôme Lalande in 1795. It depicted a wall-mounted quadrant that he and his nephew Michel Lefrançois de Lalande had charted the celestial sphere with.[1] It was between the constellations of Boötes and Draco, near the tail of Ursa Major,[2] containing stars between β Bootis and η Ursae Majoris (Alkaid).[3] This constellation is not recognized by the IAU. However, the Quadrantid meteor shower is named after it.

Johann Elert Bode converted its name to Latin as Quadrans Muralis and shrank the constellation a little in his 1801 Uranographia star atlas, to avoid it clashing with neighboring constellations.[1]

Notable features[edit]

  • The variable star BP Boötis was a member of the constellation.
  • 39 Boötis is a double star that was transferred by Lalande into Quadrans.[4]
Quadrans Muralis can be seen at the top left of this 1825 star chart from Urania's Mirror.


  1. ^ a b Ridpath, Ian. "Quadrans Muralis". Star Tales. Self-published. Retrieved 25 March 2016. 
  2. ^ Ridpath, Ian. "Lalande's Quadrans Muralis". Star Tales. Self-published. Retrieved 25 March 2016. 
  3. ^ Inglis, Mike; Moore, Patrick (2015). The Observer's Year: 366 Nights of the Universe: 2015 – 2020. New York, New York: Springer. p. 178. ISBN 978-3-31918-678-8. 
  4. ^ Smyth, William Henry (1844). A Cycle of Celestial Objects: For the Use of Naval, Military, and Private Astronomers. 2. London, United Kingdom: John W. Parker. p. 329.