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Contains:  Crescent nebula, NGC 6888
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Crescent Nebula - NGC 6888, 


            Chris Howard
Crescent Nebula - NGC 6888
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Crescent Nebula - NGC 6888

Technical card

Dates:June 11, 2019

Frames: 61x300"

Integration: 5.1 hours

Avg. Moon age: 8.74 days

Avg. Moon phase: 64.20%

Basic astrometry details job: 2744974

RA center: 20h 12' 30"

DEC center: +39° 19' 12"

Pixel scale: 7.858 arcsec/pixel

Orientation: 120.443 degrees

Field radius: 1.634 degrees

Resolution: 1194x903

Locations: Home Observatory, North Hampton, New Hampshire, United States

Data source: Backyard


The Crescent Nebula, NGC 6888 (top right) is an emission nebula in the constellation Cygnus, about 5000 light-years away. Like most of this region around Cygnus, you can't do anything in hydrogen-alpha or sulfur2 without wading through clouds of the stuff—billowing, eddying, and general nebulousing. It's beautiful. There's a Wolf-Rayet star, WR 136, at the lower left edge of the Crescent Nebula (from this angle), and it's stirring up violent stellar winds and blazing quickly through its life; it's expected to go supernova in a couple hundred thousand years, and it's only a four or five million years old. WR stars are unusual: they're very bright--thousands of times brighter than our sun, and they burn much hotter, thousands of times hotter than almost all other stars. And they have very short lifespans. From Wikipedia: "According to recent estimations, WR 136 is 600,000 times brighter than the Sun, 21 times more massive, and 5.1 times larger. Its surface temperature is around 70,000 kelvins". Notes: Astronomik Ha, OIII, and SII filters, William Optics GT81 at f/4.7, ZWO ASI1600MM Pro cooled mono camera, on an iOptron CEM25P mount.



Chris Howard
License: None (All rights reserved)

Sky plot

Sky plot


Crescent Nebula - NGC 6888, 


            Chris Howard