Quadrans Muralis

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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]

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 other constellations.[1]

It is no longer in use, but the Quadrantid meteor shower is named after it.

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.