Hemisphere:  Northern  ·  Constellation: Cygnus (Cyg)  ·  Contains:  Crescent nebula  ·  NGC 6888
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Crescent Nebula - 10/1/2010 (HaRGB), 


Crescent Nebula - 10/1/2010 (HaRGB)
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Crescent Nebula - 10/1/2010 (HaRGB)

Technical card

Imaging telescopes or lenses: Stellarvue SV105

Imaging cameras: QHYCCD QHY9M

Mounts: Takahashi EM-200 Temma2

Guiding telescopes or lenses: Orion ST 80

Software: PHD guiding  ·  Sequence Generator Pro  ·  PixInsight  ·  Nebulosity

Filters: Astronomik B Type IIc  ·  Astronomik G Type IIc  ·  Astronomik R Type IIc  ·  Ha

Dates:Sept. 4, 2010Oct. 1, 2010

Astronomik B Type IIc: 5x600" -15C bin 1x1
Astronomik G Type IIc: 5x600" -15C bin 1x1
Ha: 6x1200" -15C bin 1x1
Astronomik R Type IIc: 5x600" -15C bin 1x1

Integration: 4.5 hours

Avg. Moon age: 23.76 days

Avg. Moon phase: 33.75%

Basic astrometry details

Astrometry.net job: 118079

RA center: 20h 12' 4"

DEC center: +38° 22' 55"

Pixel scale: 2.640 arcsec/pixel

Orientation: 90.248 degrees

Field radius: 0.831 degrees

Resolution: 620x388


The Crescent Nebula (NGC6888) is a rare sight in the Milky Way. The shape of this nebula is a distinct result of gases and energy colliding in a unique way. The star in the center of the nebula (large white) is classified as a Wolf-Rayet star. These stars are amongst the largest known stars that are capable of existing (physically) and only 300 or so are known to exist. These stars are so massive and energetic that they have only a small fraction of the life of stars like our own. These stars can enter the "red giant" phase of their life in only a million or so years. Smaller stars (like the sun) will not enter the red giant phase for several billion years. During the red giant phase, this star will shed its outer shells as gas. Later in life, the Wolf-Rayet star will begin to emit extremely high energy stellar winds. This wind colliding with the gases it shed during its red giant phase (about 400,000 years ago) creates the unique crescent shape as the wind is deflected.

NGC 6888 is approximately 5000 light years distant and is located in the constellation Cygnus. From edge to edge, the Crescent Nebula spans 20 light light years across.


Sky plot

Sky plot


Crescent Nebula - 10/1/2010 (HaRGB),