M 1     Crab Nebula        Click on photo to return to 'Diffuse Nebulae'             Home

M 1    NGC 1952    Crab Nebula

Other description: Nebula.
Constellation:  Tau
Dreyer description: Very bright, very large, extended 135° +/-, very gradually little brighter middle, resolvable, but mottled; = M1.
Magnitude:  8.4
RA: 05h 34m 30.0s  Dec: +22°01'00"  (Epoch 2000)      Rise: 15:44  Transit: 23:04  Set: 06:28
Size: 6.0'

SEDS description;
The Crab nebula is the expanding remains of a star that was seen to explode by Chinese astronomers in the year 1054AD. It is one of the strongest radio sources in the sky and was first identified with the optical nebula seen here by Australian astronomers in 1947.
 At the heart of the nebula is a rapidly-spinning neutron star ( about 30 times per second ), a pulsar, and it powers the diffuse, strongly polarised bluish 'synchrotron' nebula from which the red emission-line filaments seem to emerge.



Photo Specifications:

16" F/4.87  Newtonian , ST-8XE, CFW8     2/10/03    Temp. = -26 C

Filter
Exposure time
Number of exposures
Binning
Luminance
3 min
4
1x1
Red
3 min
4
2x2
Green
3 min
4
2x2
Blue
4.8 min
4
2x2
Other








Processing;    MaxIm, histogram, stretch, DDP, align, color combine; PhotoImpact, Final artifact touchup