象限仪座1795

约翰·波德将其名称改为拉丁语： Quadrans Muralis，并在1801年的《Uranographia》星图中将星座缩小了一点，以避免与邻近的星座发生冲突。

在1922年，在国际天文学联合会正式确定其官方认可的星座清单时，废弃了象限仪座。

显著特点

变星牧夫座BP是该星座的一员。

天枪增三（牧夫座39）是由拉兰德转移到象限仪座的双星。

象限仪座流星雨仍然以这个废弃的星座命名。

Quadrans Muralis (Latin for mural quadrant) was a constellation created by the French astronomer Jérôme Lalande in 1795. It depicted a wall-mounted quadrant with which he and his nephew Michel Lefrançois de Lalande had charted the celestial sphere, and was named Le Mural in the French atlas. It was between the constellations of Boötes and Draco, near the tail of Ursa Major, containing stars between β Bootis (Nekkar) and η Ursae Majoris (Alkaid).

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.

In 1922, Quadrans Muralis was omitted when the International Astronomical Union (IAU) formalized its list of officially recognized constellations.

Notable features

44 Boötis was the brightest star of Lalande's version of the constellation. the primary component of the system 44 Boötis A was named Quadrans by the IAU Working Group on Star Names in 2025.

CL Draconis was the brightest star of Bode's version of the constellation.

The variable star BP Boötis was a member of the constellation.

39 Boötis is a double star that was transferred by Lalande into Quadrans.

The Quadrantid meteor shower is still named after the obsolete constellation.