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M1
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M1 Crab Nebula
The Crab Nebula (catalogue designations M1, NGC 1952, Taurus A) is a supernova remnant and pulsar wind nebula in the constellation of Taurus.
At X-ray and gamma-ray energies above 30 keV, the Crab is generally the strongest persistent source in the sky, with measured flux extending to above 1012 eV. Located at a distance of about 6,500 light-years (2 kpc) from Earth, the nebula has a diameter of 11 light years (3.4 pc) and expands at a rate of about 1,500 kilometers per second. It is part of the Perseus Arm of the Milky Way Galaxy.
[top]History of M1 the Crab Nebula
The M1 Crab nebula was observed by John Bevis in 1731; it corresponds to a bright supernova recorded by Arab, Chinese and Japanese astronomers in 1054.
Messier 1 : R.A. 5 h 28 m '5, N. 21 57'. This is the famous "Crab nebula" in Taurus. It lies about 1 north preceding the star Tauri. It was first seen by Bevis in 1731. It was again seen by Messier in 1758, while observing the comet of that year, and its re-discovery induced him to form his catalogue of nebulae, to help observers in distinguishing these objects from comets. Sir John Herschel thought it was a cluster of stars. Lord Rosse's great telescope was supposed to have resolved it into stars, but photographs, taken by Dr. Isaac Roberts in 1892 and 1896, demonstrated a very nebulous appearance, and but little of the "crab-like " form depicted in Lord Rosse's drawing.
[top]M1 Crab Nebula Map
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[top]Astronomy Forum Discussions on M1
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Created by , 06-09-2012 at 01:24 PM Last edited by , 06-16-2012 at 07:21 AM Last comment by on 06-09-2012 at 01:45 PM 2 Comments, 1,141 Views |
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