I took five images of the Crab Nebula one night over a year ago, just to see what it would look like. My intention was to go back and do a proper imaging sequence when I had time. That time never came, and I have probably missed my opportunity to image it this year. As a consolation, I went back to the original five images and reprocessed them using the techniques that I have learned since creating the original.
|Messier 1 (Crab Nebula), Epsilon-200 on NJP, 5x180|
The debris cloud was discovered in 1731 by John Bevis. Charles Messier found it in 1758 (not realizing that it had been previously discovered), and mistook it for Halley's comet. He soon realized his mistake, and this prompted him to compile his famous catalog of fuzzy objects that are not comets--the Messier Catalog. Messier 1 gained is common name, Crab Nebula, based on a drawing made by Lord Rosse in 1844.
The true nature of the "guest star" was not revealed until the early 20th century, when astronomers compared the results of observations gathered over several years and found that the nebula was expanding. Calculations based partly on the rate of expansion revealed that the event that created the nova was the "guest star" observed by the Chinese in 1054.