Celestial hemisphere:  Northern  ·  Constellation: Cepheus (Cep)  ·  Contains:  Bow-Tie nebula  ·  NGC 40  ·  PK120+09.1
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Caldwell 2 (NGC 40) nebula in narrowband, Bruce Donzanti
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Caldwell 2 (NGC 40) nebula in narrowband

Getting plate-solving status, please wait...
Caldwell 2 (NGC 40) nebula in narrowband, Bruce Donzanti
Powered byPixInsight

Caldwell 2 (NGC 40) nebula in narrowband

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Description

Caldwell 2 (NGC 40), nicknamed the Bow-Tie, is a mag. +10.7, is a planetary nebula located in the northern constellation of Cepheus. Discovered by William Herschel on November 25, 1788, it

is composed of hot gas around a dying star. The star has ejected its outer layer which has left behind a smaller, hot star with a temperature on the surface of about 50,000 degrees Celsius. Radiation from the star causes the shed outer layer to heat to about 10,000 degrees Celsius, and is about one light-year across. About 30,000 years from now, scientists theorize that NGC 40 will fade away, leaving only a white dwarf star approximately the size of Earth.

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Caldwell 2 (NGC 40) nebula in narrowband, Bruce Donzanti

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