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Contains:  M 1, Crab nebula, NGC 1952
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The Crab Nebula, M1 (NGC 1952), 


            Steven Bellavia
The Crab Nebula, M1 (NGC 1952)

The Crab Nebula, M1 (NGC 1952)

Technical card

Resolution: 1800x1200

Dates:Jan. 14, 2019

Frames:Optolong 7nm Ha 2": 33x300" (gain: 100.00) -15C bin 2x2

Integration: 2.8 hours

Darks: ~24

Flats: ~30

Flat darks: ~30

Avg. Moon age: 7.60 days

Avg. Moon phase: 52.30%

Bortle Dark-Sky Scale: 4.00

Temperature: -3.00 job: 2468231

RA center: 5h 34' 32"

DEC center: +22° 0' 54"

Pixel scale: 0.978 arcsec/pixel

Orientation: 184.022 degrees

Field radius: 0.294

Data source: Backyard


The Crab Nebula, M1, NGC 1952, Taurus A, is a supernova remnant in the constellation of Taurus. It is the remains of a bright supernova recorded by Chinese astronomers in 1054. The nebula was observed later by English astronomer John Bevis in 1731. The nebula was the first astronomical object identified with a historical supernova explosion.

The nebula lies in the Perseus Arm of the Milky Way galaxy, at a distance of 6,500 light years from Earth. It has a diameter of 11 light years, corresponding to an apparent diameter of some 7 arc-minutes, and is expanding at a rate of about 1,500 kilometers per second, or 0.5% of the speed of light.

At the center of the nebula lies the Crab Pulsar, a neutron star 28–30 kilometers across with a spin rate of 30.2 times per second, which emits pulses of radiation from gamma rays to radio waves. (Hence the "Taurus A" radio source designation) At X-ray and gamma ray energies above 30 KeV, the Crab Nebula is generally the brightest persistent source in the sky, with measured flux extending to above 10 TeV. The nebula's radiation allows for the detailed studying of celestial bodies that occult it. In the 1950s and 1960s, the Sun's corona was mapped from observations of the Crab Nebula's radio waves passing through it, and in 2003, the thickness of the atmosphere of Saturn's moon Titan was measured as it blocked out X-rays from the nebula.

The inner part of the nebula is a much smaller pulsar wind nebula that appears as a shell surrounding the pulsar.



Steven Bellavia
License: None (All rights reserved)

Sky plot

Sky plot


The Crab Nebula, M1 (NGC 1952), 


            Steven Bellavia