description Westbrook Nebula Overview
The Westbrook Nebula, cataloged as CRL 618, is a bipolar protoplanetary nebula located in the northern constellation of Auriga. It represents a brief evolutionary phase where a dying post-asymptotic giant branch star is expelling its outer layers, shaping the surrounding gas and dust into distinct lobes. Astronomers study this nebula to understand the complex transition from a red giant into a white dwarf. It is noted for its high-velocity molecular outflows and dense central core.
help Westbrook Nebula FAQ
What is the Westbrook Nebula's catalog number?
The Westbrook Nebula is cataloged as CRL 618 and lies in the constellation Auriga. It is a bipolar protoplanetary nebula formed around a dying post-asymptotic giant branch star.
Is CRL 618 a planetary nebula yet?
It is usually classified as a protoplanetary or pre-planetary nebula, meaning it is in the short phase before the central star fully ionizes its expelled envelope. Studies describe this transition as having begun around 200 years ago.
Why does the Westbrook Nebula have two lobes?
Fast bipolar jets and outflows are carving through older gas released during the star's asymptotic giant branch phase. Observations report shocked gas expanding at around 200 kilometers per second.
How far away is the Westbrook Nebula, and who is it named for?
CRL 618 is around 3,600 light-years away in Auriga. The name honors William E. Westbrook.
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