|
|
Crab Nebula
|
Crab Nebula
M1, the Crab Nebula
Observation data: J2000.0 epoch
Type
Supernova remnant
Right ascension
05h 34m 31.94s
Declination
+22° 00' 52.2?
Distance
6.5 ± 1.6 kly (2.0 ± 0.5 kpc)
Apparent magnitude (V)
+8.4
Apparent dimensions (V)
420? × 290?
Constellation
Taurus
Physical characteristics
Radius
5.5 light year (1.7 pc)
Absolute magnitude (V)
-3.1 ± 0.5
Notable features
Optical pulsar
Other designations
Messier 1, NGC 1952, Sharpless 244
See also: Diffuse nebula, Lists of nebulae
v
t
e
The Crab Nebula (catalogue designations M1, NGC 1952, Taurus A) is a supernova remnant and pulsar wind nebula in the constellation of Taurus. The nebula was observed by John Bevis in 1731; it corresponds to a bright supernova recorded by Arab, Chinese and Japanese astronomers in 1054.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.At the center of the nebula lies the Crab Pulsar, a neutron star (or spinning ball of neutrons), 28–30 km across, which emits pulses of radiation from gamma rays to radio waves with a spin rate of 30.2 times per second. The nebula was the first astronomical object identified with a historical supernova explosion.The nebula acts as a source of radiation for studying celestial bodies that occult it. In the 1950s and 1960s, the Sun's corona was mapped from observations of the Crab'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 cloudy remnants of SN 1054 are now known as the Crab Nebula. The nebula is also referred to as Messier 1 or M1, being the first Messier Object catalogued in 1758.
Cite error: There are tags on this page, but the references will not show without a {{Reflist}} template or a tag; see the help page.
|
|
Created By:
System
|
|
|
|
|