NGC7000 Cygnus's Wall

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2014/08/23 - The North America Nebula (NGC 7000 or Caldwell 20) is an emission nebula in the constellation Cygnus, close to Deneb (the tail of the swan and its brightest star). The remarkable shape of the nebula resembles that of the continent of North America, complete with a prominent Gulf of Mexico. It is sometimes incorrectly called the "North American Nebula".

The North America Nebula is large, covering an area of more than four times the size of the full moon; but its surface brightness is low, so normally it cannot be seen with the unaided eye. Binoculars and telescopes with large fields of view (approximately 3°) will show it as a foggy patch of light under sufficiently dark skies. However, using a UHC filter, which filters out some unwanted wavelengths of light, it can be seen without magnification under dark skies. Its prominent shape and especially its reddish color (from the hydrogen Hα emission line) show up only in photographs of the area. Cygnus's Wall is a term for the "Mexico and Central America part" of the North America Nebula. The Cygnus Wall exhibits the most concentrated star formations in the nebula.

Object information
Name : NGC7000 Cygnus's Wall
Type : Nebula
Constellation : Cygnus
Distance : 1.600 light-year
Apparent dimensions : 120' x 100'
Apparent magnitude : 4.00

Image information
Image date : 2014/08/23, 2014/08/27, 2014/08/28, 2014/08/29, 2014/08/31, 2014/09/01, 2014/09/02
Right ascension : 21:0:15.086
Declination : 43°47' 1.90"
Focal length : 1686.81 mm
Focal ratio : f/6.64
Image resolution : 0.660 arcsec/pixel
Field of view : 35' 40.1" x 26' 15.5"
Sky quality : 21.50 mag/arcsecond2
Sensor temperature : -20°C
Light frames : 24 hours, 50 minutes total exposure time
9x 300 sec. red unbinned
7x 300 sec. green unbinned
10x 300 sec. blue unbinned
33x 1200 sec. hydrogen-α unbinned
16x 1200 sec. oxygen-III unbinned
19x 1200 sec. sulfur-II unbinned
Image acquisition with ACP Observatory Control Software, ACP Scheduler and Maxim DL
Auto-guiding with Maxim DL
Auto-focusing with FocusMax
Bias frames : 100x unbinned
Dark frames : None
Flat frames : 0x RGB unbinned
0x hydrogen-α unbinned
0x oxygen-III unbinned
0x sulfur-II unbinned
Automated sky twilight flats with ACP
Processing : PixInsight for calibration, alignment and integration.
Adobe Photoshop CS6 for final touch.

Equipment information
Telescope : Orion Optics 10" ODK
Corrector : None
Focuser : Baader SteelTrack with SteelDrive
Mount : Mesu Mount 200 with Sidereal Technology SiTech Controller
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 :, Hautes-Alpes, France