WLike a billowing blanket let down across the sky, this textured red streak is NGC1499, the California Nebula. It sprawls across 2.5 degrees of sky due east of M45.
West of the Pleiades is a red streak that spans 2.5 degrees of sky. NGC1499 is the designation for an emission nebula that emits mostly in a set of narrow Hydrogen bands. Named for its distinct shape, this is the California Nebula.