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Physics & Astronomy Department

Astr110 Photography Projects, Spring 2009

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ClownFace Nebula (NGC 7293), Jordan Wood

Clownface

The target I have chosen is the Clownface or Eskimo nebula, it has been given two titles. A nebula is an interstellar cloud of combined dust, hydrogen gas and plasma. Specifically the Clownface Nebula is a bipolar double-shell planetary nebula. A bipolar double-shell nebula is distinctive due to its appearance of two forms pulled together. A planetary nebula is identified by the plasma casing. This nebula was first discovered by William Herschel in the year 1787. Spotted first from the ground the nebula resembled a head in a parka hence its two names. This nebula is approximately 3000 light-years away in is located in the constellation of Gemini.            

The image I have taken above lacks the definition of images taken by the Hubble Telescope and shows more green. The angular size of Clownface is .81 arcminutes. The linear size is .71 light-years.It is also hard to distinguish the two “ears” for which its name is derived. The colors in my image show a mixture of those that really exist, the shell of plasma and the core which truly display many distinct colors.

References:
Hester, Jeffl. "Eskimo Nebula"."Windows to theSky". Hubble 2000 image.

One of the best image of this nebula was taken in 2000 with the Hubble Telescope. Nemiroff, Robert. "Astronomy Picture of The Day"<http://apod.nasa.gov/apod/ap031207.html>

Right Ascension (J2000) 07' 29 12.00'
Declination (J2000) '+20 55 00.0'
Filters used blue(B), green(V), red(R), and clear(C)
Exposure time per filter 60 seconds in C, 60 seconds in BVR
Date observed

April 5, 2009 (C)
April 5, 2009 (BVR)