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Physics & Astronomy Department

Astr111 Photography Projects, Fall 2009

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Iris Nebula , Jessica Duffing

The NGC7023, sometimes called the Iris Nebula is in the constellation of Cepheus and which also is 6 light years across. In the fertile starfields of Cepheus there's interstellar dust and gas taking the forms of delicate cosmic petals which spread out to be 1,300 light years away. There are many nebula's in the sky taking the forms of flowers leaving the Iris Nebula not alone with its form. The ranges of symmetries and colors are impressive details showing off the nebulas beautiful digital image. A young star which is massive and hot is within the dusty nebula material of the Iris which was formed in its formative years. There is a reddish photoluminesence which is shown through central filaments of cosmic dust. This reddish photoluminsence is shown by visible red light through the star's invisible ultraviolet radiation when some of the dust grains are effectively converted. Though, the dominant color of the nebula is blue. This dominant color happens when characteristics of dust grains reflect the sunlight and this usually happens for the dust grains that are behind the star. There are fantastic and convoluted shapes the eye is able to see because they are formed by cold molecular gas and dark, obscuring clouds of dust. This nebula also may contain complex molecules known as PAHs which are seen by infrared observations.

The Iris Nebula shows off a brilliant blue light because the dust grains reflect starlight which means these dust grains are behind the star because they reflect starlight. You can also see a faint red light just above the star where central filaments show a reddish photoluminsence. This is shown by visible red light through invisible ultraviolet radiation when some dust grains are convected effectively through the star. The red light is made up of Hydrogen. The structure of the Iris Nebula is formed by interstellar dust and gas taking the forms of delicate cosmic petals because of the role of hydrogen molecules. The Iris Nebula's linear size is 11.46 light years and was founded by Sir William Herschel in the year of 1794.

References:
Misti, Jim. "Iris Nebula." Astonomy Picture of the Day. <http://antwrp.gsfc.nasa.gov/apod/ap041104.html>.

Plotner, Tammy. NGC 7023-'Iris From The Dust' by Kent Wood. <http://www.universetoday.com/2008/09/03/ngc-7023-iris-from-the-dust-by-kent-wood/>

Right Ascension (J2000) 21:00:38
Declination (J2000) +68:12:39
Filters used blue(B), green(V), red(R), and clear(C)
Exposure time per filter 10 seconds in C, 30 seconds in BVR
Date observed

November 1, 2009 (C)
November 1, 2009 (BVR)