NGC 6888
Common Name: Crescent Nebula
Also Known as: Sharpless 105 (Sh2-105), Caldwell 27, Euro Sign Nebula
Object Type: Emission Nebula
Constellation: Cygnus
Distance from Earth: 5,000 Light years
Apparent Magnitude: 7.4
Coordinates: RA 20H 12M 7S DEC 38deg 21min 3sec
Actual Size: 25 light years in diameter
Apparent Dimensions: 18 arc-minutes x 12 arc-minutes
--------------------------------------------------------------------------
Environmental Data
Date: July 26, 2021 Start Time: 9:36PM End Time: 4:11AM SQM:
Moon Age: 17.1 days Moonrise: 10:11PM Moon Illumination: 93.9%
Temperature: 81 degrees F Humidity: 68% Dew Point: 69 degrees F
Location: Westport, Massachusetts 02790 Sky Condition: Clear
Comment:
--------------------------------------------------------------------------
Imaging Scope Data
Mount: iOptron CEM120 Camera: ZWO ASI071 OSC Focuser: Optec DirectSync SV35
Telescope: Stellarvue SVX130 refractor Focal Length: 910mm
Focal Reducer/Field Flattener: Field Flattener Filter: IDAS NB-1
Rotator: Pegasus Falcon rotator Power Control: Dew Heater: Kendrick dew strip
Imaging Software
Mount: iOptron Commander Focuser: Optec FocusLynx Commander
Imaging: Sequence Generator Pro Platesolve: ASTAP Rotator/Control: Pegasus Unity Platform
Imaging Status
Imaging Software: Sequence Generated Focus HFR: 1.63 Platesolve: Good on 2nd attempt
--------------------------------------------------------------------------
Guide Scope Data
Telescope: Stellarvue SVX130 refractor Camera: ZWO ASI290 Focuser: Optec DirectSync SV35
Dew Heater: Kendrick dew strip Software: PHD2 Tracking Result: 0.8 arc-seconds RMS
--------------------------------------------------------------------------
Images Taken
Number of light frames: 77 Duration: 4 minutes Gain: Unity Gain
Camera Temperature: 0 degrees C Binning: 1x1 F-Stop: 7.0
Total Integration Time: 5.13 hours
--------------------------------------------------------------------------
Number of flat frames: 50 Duration: 0.2 seconds Gain: Unity Gain
Camera Temperature: 0 degrees C Binning: 1x1 F-Stop: 7.0
Flat Field Illumination: All-Pro 'Spike-a-Flat Field standard' illuminated panel
--------------------------------------------------------------------------
Number of Dark frames: 50 (from library) Duration: 4 minutes Gain: Unity Gain
Camera Temperature: 0 degrees C Binning: 1x1 F-Stop: 7.0
--------------------------------------------------------------------------
Number of Bias frames: 50 (from library) Duration: 0.001 seconds Gain: Unity Gain
Camera Temperature: 0 degrees C Binning: 1x1 F-Stop: 7.0
--------------------------------------------------------------------------
Imaging Processing
Imaging Processing Software: PixInsight
Processes utilized: Linear - calibration/integration: Flats ImageCalibration with Master Bias, Flat ImageIntegration, Images ImageCalibration with Flat Master & Dark Master, Debayer, SubFrameSelector, StarAlign, ImageIntegration
Linear - Background extraction, Color correction, deconvolution, noise reduction: DynamicCrop, DynamicBackgroundExtraction, ImageSolve, SpectroPhotometricColorCalibration, BlurXTerminator, NoiseXterminator
Non-Linear: GeneralizedHyperbolicStretch script, CurvesTransformation, StarReduction script, CurvesTransformation
--------------------------------------------------------------------------
Notes:
Click Below Image for Full Size:
Click to Return to Home Page