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Planetary Nebula NGC 2371
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Name: NGC 2371, 2372
Description: Planetary nebula
Position(J2000): RA 7h 25m 33.83s   Dec 29° 29' 39.20"
Constellation: Gemini
Distance: 4500 light years
Visual magnitude: 13
Angular dimensions: 0.727x 0.727 arcmin
Exposure Date: November 15, 2007
Exposure Time: 1.8 hours
Field of view: 1.26 x 1.83 arcminutes
Orientation: North is 138.4° right of vertical
Image Credit: NASA, ESA, and the Hubble Heritage Team (STScI/AURA)
Release date: March 4, 2008
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ABOUT THIS IMAGE:

Probing a glowing bubble of gas and dust encircling a dying star, the NASA/ESA Hubble Space Telescope reveals a wealth of previously unseen structures.

The object, called NGC 2371, is a planetary nebula, the glowing remains of a Sun-like star. It was discovered on March 12, 1785 by William Herschel. The remnant star visible at the center of NGC 2371 is the super-hot core of the former red giant, now stripped of its outer layers. Its surface temperature is a scorching 240,000 degrees Fahrenheit. NGC 2371 lies about 4,300 light-years away in the constellation Gemini.

The Hubble image reveals several remarkable features, most notably the prominent pink clouds lying on opposite sides of the central star. This color indicates that they are relatively cool and dense, compared to the rest of the gas in the nebula.

Also striking are the numerous, very small pink dots, marking relatively dense and small knots of gas, which also lie on diametrically opposite sides of the star. These features appear to represent the ejection of gas from the star along a specific direction. The jet's direction has changed with time over the past few thousand years. The reason for this behavior is not well understood, but might be related to the possible presence of a second star orbiting the visible central star.

A planetary nebula is an expanding cloud of gas ejected from a star that is nearing the end of its life. The nebula glows because of ultraviolet radiation from the hot remnant star at its center. In only a few thousand years the nebula will dissipate into space. The central star will then gradually cool down, eventually becoming a white dwarf, the final stage of evolution for nearly all stars.

The Hubble picture of NGC 2371 is a false-color image, prepared from exposures taken through filters that detect light from sulfur and nitrogen (red), hydrogen (green), and oxygen (blue). These images were taken with Hubble's Wide Field Planetary Camera 2 in November 2007, as part of the Hubble Heritage program.

From Wikipedia:

NGC 2371-2 is a dual lobed planetary nebula located in the constellation Gemini. Visually, it appears like it could be two separate objects; therefore, two entries were given to the planetary nebula by William Herschel in the "New General Catalogue", so it may be referred to as NGC 2371, NGC 2372, or variations on this name.