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Astr111 Photography Projects, Spring 2007

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M1-The Crab Nebula-Leah Slager

M1 Crab Nebula

M1, also referred to as the Crab Nebula was discovered back in the year 1054 AD. It is located near the southern "horn" of Taurus, the Bull. This nebula is an expanding cloud of gas which came to be after the explosion of a star as supernova. The Crab Nebula was created from Supernova 1054. Supernovae are stellar explosions, the violent end of an old star, which creates an extremely bright object that is initially made of ionized gas. Some Supernovae may outshine its entire galaxy before fading from view. A supernova is a relatively rare event. The material that is reddish in color consists of hydrogen, while the green filaments are composed of oxygen. The light given off by this material is called fluorescence; it occurs when photons are emitted from electrons while switching between energy states.

The Crab Nebula is located at a distance of 6,300 light years from earth, it has a diameter of 11 light years across, and it is expanding at a rate of 1,500 kilometers per second. According to ancient records the Crab Nebula was visible in daylight for 23 days, and 653 days to the naked eye during the night. Crab Nebula was given its name after Lord Rosse made a drawing of it, in the year 1844, which looked like a crab. It has twice been recorded that it was mistaken to be the comet Halley, in the years 1758 and 1835.

References:
<http://www.seds.org/messier/m/m001.html>

<http://astro.nineplanets.org/twn/n1952x.html>

<www.calvin.edu/academic/phys/observatory/images/crab/CrabNebula.html>

Right Ascension (M1) 05:34:30
Declination (J2000) +22:01:00
Filters used blue(B), green(V), red(R), and clear(C)
Exposure time per filter 300 seconds in CBVR
Date observed

March 1, 2007 (CBVR)