Sh2-240 / Simeis 147 - Supernova Remnant in Taurus

Simeis 147 aka Sh2-240

Simeis 147 (aka Sh2-240): Seen towards the constellation Taurus it covers nearly 3 degrees (6 full moons) on the sky corresponding to a width of 150 light-years at the stellar debris cloud's estimated distance of 3,000 light-years. This image represents four hours of exposure time with an H-alpha filter, transmitting only the light from recombining hydrogen atoms in the expanding nebulosity and tracing the regions of shocked, glowing gas. This supernova remnant has an apparent age of about 100,000 years - meaning light from the massive stellar explosion first reached Earth 100,000 years ago - but this expanding remnant is not the only aftermath. The cosmic catastrophe also left behind a spinning neutron star or pulsar, all that remains of the original star's core. [Source: NASA's Astronomy Picture of the Day website]

Apogee U16M camera w Astrodon Gen II filters
Takahashi FSQ Refractor w Robofocus
16 x 15 min for H-Alpha
Paramount ME guided w ST-402 and eFinder
Image acquisition in CCDSoft5

Calibration, Alignment and Sigma Reject combine in Maxim
Levels, Curves in PS CS4

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Captured Oct 10th 2010
Flesherton, Ontario