Astronomy: General

The Oxford Dictionary of Phrase and Fable A Dictionary of Earth Sciences Further reading

Hale–Bopp

The Oxford Dictionary of Phrase and Fable | 2006 | | Copyright

Hale–Bopp a periodic comet which passed close to the sun in the spring of 1997 and was one of the brightest of the 20th century. It was exceptionally large and active, has a period of just over 4,000 years, and was the first comet to exhibit a sodium tail. Named after Alan Hale and Thomas Bopp, the American astronomers who discovered it (independently of each other).

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ELIZABETH KNOWLES. "Hale–Bopp." The Oxford Dictionary of Phrase and Fable. 2006. Encyclopedia.com. 30 May. 2012 <http://www.encyclopedia.com>.

ELIZABETH KNOWLES. "Hale–Bopp." The Oxford Dictionary of Phrase and Fable. 2006. Encyclopedia.com. (May 30, 2012). http://www.encyclopedia.com/doc/1O214-HaleBopp.html

ELIZABETH KNOWLES. "Hale–Bopp." The Oxford Dictionary of Phrase and Fable. 2006. Retrieved May 30, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O214-HaleBopp.html

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Hale—Bopp

A Dictionary of Earth Sciences | 1999 | | Copyright

Hale—Bopp A comet with an orbital period of more than 4000 years; perihelion date 31 March 1997; perihelion distance 0.914 AU.

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AILSA ALLABY and MICHAEL ALLABY. "Hale—Bopp." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 30 May. 2012 <http://www.encyclopedia.com>.

AILSA ALLABY and MICHAEL ALLABY. "Hale—Bopp." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (May 30, 2012). http://www.encyclopedia.com/doc/1O13-HaleBopp.html

AILSA ALLABY and MICHAEL ALLABY. "Hale—Bopp." A Dictionary of Earth Sciences. 1999. Retrieved May 30, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-HaleBopp.html

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Free newspaper and magazine articles

	Snowball surprise.(Comet Hale-Bopp) Magazine article from: Popular Mechanics; 6/1/1997
	Heralding Hale-Bopp. (comet Hale-Bopp visible to naked eye)(Astronomy)(Brief... Magazine article from: Science News; 3/8/1997
	SKY WATCHERS MAY BE ABLE TO CATCH ``UNUSUAL'' COMET SCIENTISTS ARE PREDICTING... Newspaper article from: The Virginian-Pilot (Norfolk, VA); 3/9/1997