Crescent nebula

NGC 6888 Crescent Nebula

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Crescent-Bl

Crescent-Bl-cropped

L: 0.8*H+0.1*S+0.1*O

R: 0.3*H+0.7*S

G: 0.8*H+0.1*S+0.1*O

B: 0.7*O+0.3*H

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NGC 6888 Crescent Nebula

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crescent-cropped

crescent

R= 0.9*H +0.1*O , G=0.1*H+0.9*O  , B=O

Crescent_SHO_cropped_web

crescent_SHO

SHO

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Crescent Nebula

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NGC 6888, Crescent Nebula – distance 5,000 light years
NGC 6888, Crescent Nebula – distance 5,000 light years

Frames : 7 x Ha x 12 min, 8 x OIII x 15 min

Palette mix : R = 0.9*Ha+0.1*OIII, G =0.1*Ha+0.9*OIII, B = OIII)

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Crescent nebula

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NGC 6888, Crescent Nebula - distance 5,000 light years
NGC 6888, Crescent Nebula – distance 5,000 light years

Frames : 7 x Ha x 12 min, 1 (duplicated 4 times) x OIII x 15 min

Used formula iif(OIII > 0.5, 1-(1-HA)*(1-(OIII -0.5)), HA*(OIII +0.5))  to make synthetic green (from http://lightvortexastronomy.blogspot.com/2013/03/tutorial-nebulae-pixinsight-guide-for.html)

Palette mix : R = Ha, G = synthetic Green, B = OIII)

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9/10/2013

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Crescent Nebula

crnR1

(subs 3x 2min, 1 x 5 min, 6x 10min UHC filter — autoguider failed)

crn0

image

image

from nova.astrometry.net
Center (RA, Dec):    (303.011, 38.400)
Center (RA, hms):    20h 12m 02.607s
Center (Dec, dms):    +38° 23′ 58.529″
Size:    47 x 50.5 arcmin
Radius:    0.575 deg
Pixel scale:    1.11 arcsec/pixel
Orientation:    Up is -158 degrees E of N

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