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M1 · Supernova Remnant
Crab Nebula
The first entry in Messier's catalogue — the expanding remnant of the supernova witnessed by Chinese astronomers in 1054 CE. At its heart spins the Crab Pulsar, a neutron star rotating thirty times each second.
M1 is the gaseous wreckage of SN 1054, a stellar explosion bright enough to be recorded by Chinese, Japanese, and Arab observers as a 'guest star' visible in daylight for 23 days and at night for nearly two years. Today the remnant is still expanding outward at roughly 1,500 km/s, a ghostly tangle of filaments glowing in the emission lines of hydrogen, helium, oxygen, and sulfur.
At the heart of the nebula lies the Crab Pulsar (PSR B0531+21) — a rapidly rotating neutron star left behind by the collapsed core of the progenitor star. Discovered in 1968, it rotates 30.2 times per second and pumps relativistic particles into the surrounding shell, lighting up the bluish synchrotron 'pulsar wind nebula' visible in deep images.
For astrophotographers M1 is a deceptively textured target. It is small (~6 × 4 arcminutes) and best framed at long focal length, but rewards narrowband imaging — the filaments respond brilliantly to Hα and OIII, while broadband captures bring out the inner bluish synchrotron continuum. Its proximity to the ecliptic occasionally produces dramatic line-of-sight conjunctions with the Moon and planets.
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