Sh 2-40

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Sh 2-40 is a large nebula in the Sagittarius constellation. It lies just north of Sh 2-41 and is along the line of sight to the strong radio source W 33, which is about 4,600 parsecs farther away than Sh 2-40.

Observation data (J2000):
- Right ascension: 18h 12m 10s
- Declination: −17° 42′ 48″

Apparent size: 15′ × 15′
Radius: 2400 parsecs

Designations: RCW 155, LBN 49

See also: Lists of nebulae