NGC6820 Emission Nebula

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2013/06/03 - Ran two automated sessions on this object with narrowband filters. I shot some extra RGB data to correct starcolors. Seeing was between 2.04" and 2.86" FWHM.

NGC 6820 is an emission nebula that surrounds open cluster NGC 6823 in Vulpecula, near M27, the Dumbbell Nebula. The nebula NGC 6820 is also called Sharpless catalog Sh 2-86. The most striking feature is the trunk-like pillar of dust and gas protruding from the east side of the nebula towards the open cluster, NGC 6823 in the west. The center of the open cluster is about two million years old and is predominantly represented by many young, bright blue stars. Outer parts of the cluster intimately involving pillars of emission nebula NGC 6820, contain even younger stars. The huge pillars of gas and dust are probably formed when surrounding gas and dust is pushed and eroded away by radiation from nearby stars. Remarkable dark globules of gas and dust are also visible in the nebula, much as is seen in the better known Eagle Nebula in Serpens or the Lagoon Nebula in Sagittarius. Open star cluster NGC 6823 is about 50 light years across and lies about 6000 light years away.


Object information
Name : NGC6820 Emission Nebula
Type : Nebula
Constellation : Vulpecula
Distance : 6K light-year
Apparent dimensions : 40' x 40'

Image information
Image date : 2013/06/03, 2013/06/02
Right ascension : 19:43:12.007
Declination : 23°14' 46.80"
Focal length : 1381.83 mm
Focal ratio : f/5.44
Image resolution : 0.806 arcsec/pixel
Field of view : 44' 15.1" x 32' 40.3"
Sky quality : 19.57, 19.52 mag/arcsecond2
Sensor temperature : -25°C
Light frames : 6 hours, 36 minutes total exposure time
6x 120 sec. RGB unbinned
6x 1200 sec. hydrogen-α unbinned
6x 1200 sec. oxygen-III unbinned
6x 1200 sec. sulfur-II unbinned
Image acquisition with CCDAutoPilot and Maxim DL
Auto-guiding with Maxim DL
Auto-focusing with FocusMax
Bias frames : 100x unbinned
Dark frames : None
Flat frames : 12x RGB unbinned
12x hydrogen-α unbinned
12x oxygen-III unbinned
12x sulfur-II unbinned
Twilight Sky Flats automated with CCDAutoPilot
Processing : PixInsight for calibration, alignment and integration.
Adobe Photoshop CS6 for final touch.

Equipment information
Telescope : Robtics 10" 2000mm f/8 Ritchey Chretien
Corrector : Astro-Physics CCDT67 Focal Reducer
Focuser : Moonlite CS Ritchey Chretien focuser with high resolution stepper motor
Mount : ASA DDM60 Pro direct drive german equatorial mount controlled with AutoSlew
Camera : QSI 683wsg-8 cooled CCD camera with Kodak KAF-8300 sensor and Off Axis Guide (OAG) port
Guidecamera : Starlight Xpress Lodestar autoguider
Filters : Astrodon Tru-Balance E-Series LRGB & Astrodon 3nm H-α, 3nm O-III, 3nm S-II and 3nm N-II
Observatory site : Etten-Leur, The Netherlands