NGC6888 & WR136 (framoro)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: Crescent Nebula · HD192003 · HD192020 · HD192041 · HD192078 · HD192102 · HD192123 · HD192163 · HD192182 · HD192303 · HD192361 · HD192422 · HD192443 · HD192444 · HD192766 · LBN 203 · NGC 6888 · Sh2-105

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NGC6888 & WR136

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NGC6888 & WR136

=MsoNormalNGC6888 is an emission nebula with HII and OIII components and a Wolf-Rayet star (WR136) inside. It is located 2.5 degrees southwest of the star γ Cygni, extends in space to a dimension of about 16 LY and is 4700 LY from the Solar System. The most intense part of the nebula is in the west, and forms an arc extended more in declination than in right ascension. This feature has led to the nebula being called crescent, as it has a "hump" to the west, like the Moon in a crescent phase. This is a typical “stellar wind bubble” generated by a massive Wolf-Rayet star (HD 192163 or WR136), which is located inside it. This star has a luminosity 500,000 times that of the Sun and a surface temperature that reaches 70,000 degrees K. Its age is estimated at about 4.5 million years, one thousandth of the age of the Sun, but it is already advanced stage of its evolution: it was previously a red supergiant with a mass 30 times that of the Sun and about 250,000 years ago it ejected its outer layers. The ejected material is hit by the star's powerful stellar wind (at a speed of about 1700 km/s), thus forming the emission nebula NGC 6888. WR136 loses mass very rapidly, the equivalent of a solar mass every 10,000 years; it is estimated that in about 100,000 years, if it is still massive enough, the star will explode in a brilliant supernova. WR 136 shows a periodic variability of its spectrum, suggesting that it is a binary system, with a neutron star as a companion.

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Status	Advanced success
Started	...
Astrometry.net job	8547285
PixInsight job	QTISNX71IUACHHWU9CZCXUYKEGE0OJVI
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	20h12m07s.543
RA (top/left)	20h12m27s.490
RA (top/right)	20h08m34s.713
RA (bottom/right)	20h11m48s.230
RA (bottom/left)	20h15m42s.363

Dec (center)	+38°24′55″.77
Dec (top/left)	+39°09′46″.69
Dec (top/right)	+38°07′58″.57
Dec (bottom/right)	+37°40′02″.42
Dec (bottom/left)	+38°41′25″.31

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NGC6888 & WR136

NGC6888 & WR136

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NGC6888 & WR136

NGC6888 & WR136

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