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Thursday, September 8th, 2011
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Supernova PTF 11K/ly / SN 2011fe in Pinwheel Galaxy

Type Ia supernova, visible from earth — the brightest visible supernova from our perspective in 40 years. The supernova was discovered by the PTF survey on 24 August 2011. The now-exploded star, formerly a white dwarf, is located in Messier 101, the Pinwheel Galaxy, 21 million light years from Earth. As I took this shot, the supernova was nearing the brightness of 2.5 billion suns.

Type Ia supernova events occur when a white dwarf star accretes enough additional matter to exceed the Chandrasekhar limit and collapse, triggering runaway fusion and a supernova explosion. Because this collapse happens at a consistent mass, the resulting explosions have very uniform characteristics, and are used as "standard candles" to measure the distance to their host galaxies.

#astro #notes

EXIF:

Width: 580
Height: 387
Company:  Canon
Camera:  Canon EOS 50D
Shot On:  2011:09:08 03:18:13
Aperture:  ƒ/1.8
Focal Length:  85.0mm
Metering Mode:  Spot
Exposure Mode:  Manual
Flash:  Did Not Fire
Exposure Time:  4.0 seconds
Exposure Program:  Manual
ISO:  3200

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