Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.arcetri.astro.it/~palla/ANDREAIMMAGINI/ISM/NGC7009.txt Дата изменения: Thu Mar 28 21:01:39 2002 Дата индексирования: Sat Dec 22 07:57:44 2007 Кодировка: Поисковые слова: созвездие лебедя

EMBARGOED UNTIL: 1:00 P.M. (EST) DECEMBER 17, 1997

PHOTO NO.: STScI-PRC97-38b


HUBBLE'S PLANETARY NEBULA GALLERY


NGC 7009 has a bright
central star at the center of a dark cavity bounded by a
football-shaped rim of dense, blue and red gas. The cavity
and its rim are trapped inside smoothly-distributed greenish
material in the shape of a barrel and comprised of the star's
former outer layers. At larger distances, and lying along
the long axis of the nebula, a pair of red "ansae", or
"handles" appears. Each ansa is joined to the tips of the
cavity by a long greenish jet of material. The handles are
clouds of low-density gas. NGC 7009 is 1,400 light-years
away in the constellation Aquarius. The Hubble telescope
observation was taken April 28, 1996 by the Wide Field
and Planetary Camera 2.

Credits: Bruce Balick (University of Washington),
Jason Alexander (University of Washington),
Arsen Hajian (U.S. Naval Observatory), Yervant Terzian
(Cornell University), Mario Perinotto (University of Florence,
Italy), Patrizio Patriarchi (Arcetri Observatory, Italy), NASA


[Bottom right ] - NGC 5307 also lies in Centaurus but is about
10,000 light-years away and has a diameter of approximately
0.6 light-year. It is an example of a planetary nebula with a
pinwheel or spiral structure; each blob of gas ejected from the
central star has a counterpart on the opposite side of the star.

Credits: Howard Bond (Space Telescope Science Institute),
Robin Ciardullo (Pennsylvania State University) and NASA