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M1: Crab Nebula in Taurus

RA = 5 hrs34 min; Dec = 22 deg 01 min.

Date & Site:

Imaged on 10/21/2014; Joshua Tree National Park, CA

Conditions: calm; 63 degrees; good seeing


Telescope: TEC 140mm Refractor (980mm fl) at f/7
Mount: AstroPhysics 1100
Camera: ST-10XME; CFW10; Hutech OAG5 autoguider

Astrodon 3nm narrowband filters


Exposures: 90 minutes each of Ha, OIII and SII for total of 3 hrs.

Collor mapped my assigning SII to red, Ha to green and OIII to blue and further processed by shifting color assignments toward green, magenta, and orange, respectively.

M1 is a supernova remnant. While the supernova was first recorded by Chinese astronomers in 1054, the nebula was not observed until 1731 by English astronomer John Bevis. This remnant houses a neutron star or pulsar which is spinning (pulsating) at a rate of 30.2 x per second emitting radiation from gama and radio waves (Source: Wikipedia).

Located about 6,500 light years it is expanding at a rate of 1,500 km/second

FOV =52 x 35 arc minutes

6,500 light years away

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