NGC 1491 is an emission nebula in the constellation Perseus.
Lying just over a degree NW of Lambda Persei, this bright nebula is an interesting object in 8" and larger telescopes. The nebula appears fan-shaped, with brighter tendrils along the edges. At its apex is a bright, roundish blob of nebulosity. In smaller telescopes, only the brighter parts of the nebula are visible; the overall size of the object is 8.7 x 2.3 arc minutes.
The reddish color of this bright, triangular nebula indicates that it is mainly composed of ionized hydrogen. The nebula has an 11th magnitude star at its center. The central star is "blowing" a bubble in the gas that surrounds it. The winds from this star are so energetic that they are breaking up the nebula around it.