Sh 2-312

Molecular cloud

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Sharpless 2-312
Nebula
Sh 2-312 seen very faintly, Gamma Pyxidis in lower-right corner
Observation data: J2000 epoch
Right ascension	08^h 59^m 12^s
Declination	−25°41′00′′^[1]
Apparent magnitude (V)	17.82
Apparent dimensions (V)	12° x 3°
Constellation	Pyxis
Designations	LBN 1077
See also: Lists of nebulae

Sh 2-312 is a nebula in the southern constellation of Pyxis. It is very large and diffuse, making it largely ignored and unstudied outside of its relation to the Gum Nebula. Sh 2-312 is located approximately 56 parsecs away from RCW 22,^[2] another nebula postulated to be a part of the larger Gum Nebula,^[3] which is itself estimated to be approximately 300 parsecs in width based on angular diameter approximation.^[4]^[5] It responds well to Hydrogen-alpha filters; however, it requires extended exposure time to become visible during observation.^[6]