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The  Elephant's Trunk Nebula | by Martin_Heigan
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The Elephant's Trunk Nebula

A cropped narrowband image of the Elephant's Trunk Nebula, a concentration of interstellar gas and dust with-in the much larger ionized gas region IC 1396 (located in the constellation Cepheus), about 2,400 light-years away from Earth.

 

Gear:

GSO 6" f/4 Imaging Newtonian Reflector Telescope.

Baader Mark-III MPCC Coma Corrector.

Garmin SkySync GPS Accessory.

Orion Mini 50mm Guide Scope.

Orion StarShoot Autoguider.

Celestron AVX Mount.

QHYCCD PoleMaster.

Celestron StarSense.

Aurora Flatfield Panel.

Optolong 36mm SHO filters.

QHYCFW2-M-US Filterwheel (7 position).

QHY163M Cooled CMOS Monochrome Astronomy Camera.

 

Lights/Subs:

Ha = 24 x 420 sec.

SII = 24 x 420 sec.

OIII = 24 x 420 sec.

 

Camera Settings:

Gain = 17

Offset = 70

CMOS Cooled to -25°C

 

Calibration Frames:

50 x Bias/Offset.

25 x Darks.

20 x Flats and Dark Flats.

 

Image Acquisition:

Sequence Generator Pro via the Mosaic and Framing Wizard.

Plate Solving in SGP via the Astrometry.net ANSVR Solver.

Autoguiding via Open PHD Guiding.

 

Processing:

Pre-Processing and Linear workflow in PixInsight,

and finished in Photoshop.

 

Wavelengths of the Electromagnetic Spectrum of Light:

Hydrogen-Alpha (656.3nm)

Oxygen-III (500.7nm)

Sulfur-II (672.4nm)

 

PixelMath:

Mapped Color Channel Combinations.

R = (0.5*SII)+(0.5*Ha)

G = (0.2*Ha)+(0.8*OIII)

B = OIII

 

Astrometry Info:

View an Annotated Sky Chart for this image.

Center RA, Dec: 323.737, 57.633

Center RA, hms: 21h 34m 56.902s

Center Dec, dms: +57° 37' 59.929"

Size: 46.8 x 60.6 arcmin

Radius: 0.638 deg

Pixel scale: 2.02 arcsec/pixel

Orientation: Up is 268 degrees E of N

View in the World Wide Telescope.

 

Martin

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Taken on July 22, 2017