NGC 2392
Common Name: Eskimo Nebula
Also Known as: Clown-faced Nebula, Lion Nebula, Caldwell 39
Object Type: Bipolar Double-shell Planetary Nebula
Constellation: Gemini
Distance from Earth: 6,520 light years
Apparent Magnitude: 10.1
Coordinates: RA 07H 29M 10.7669S DEC 20 deg 54 min 42.488 sec
Actual Size: 0.68 light years in diameter
Apparent Dimensions: 48 arc-minutes x 48 arc-minutes
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Environmental Data
Date: February 21, 2019 Start Time: 8:04PM End Time: 9:11PM SQM: 19.80
Moon Age: 16.6 days Moonrise: 1:10AM Moon Illumination: 95.9%
Temperature: 42 degrees F Humidity: 50% Dew Point: 24.7 degrees F
Location: Westport, Massachusetts 02790 Sky Condition: Clear
Comment:
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Imaging Scope Data
Mount: Celestron CPC1100 mount Camera: ZWO ASI071 OSC Focuser: Optec QuickSync FT20
Telescope: Celestron 11 inch SCT Edge Focal Length: 1960mm
Focal Reducer/Field Flattener: 0.7 focal reducer Filter: None
Rotator: Manual Power Control: Dew Heater: Kendrick dew strip
Imaging Software
Mount: Celestron CPC1100 Focuser: Optec FocusLynx Commander
Imaging: Sequence Generator Pro Platesolve: None Rotator/Control:
Imaging Status
Imaging Software: Sequence Generated Focus HFR 3.2 Platesolve:
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Guide Scope Data
Telescope: Stellarvue SV90 refractor Camera: Lodestar X2 Focuser: Optec DirectSync SVX30
Dew Heater: Kendrick dew strip Software: PHD2 Tracking Result: 1.98 arc-seconds RMS
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Images Taken
Number of light frames: 30 Duration: 2 minutes Gain: HDR
Camera Temperature: -20 degrees C Binning: 1x1 F-Stop: 7.0
Total Integration Time: 1 hour
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Number of flat frames: 30 Duration: 0.6 seconds Gain: HDR
Camera Temperature: -20 degrees C Binning: 1x1 F-Stop: 7.0
Flat Field Illumination: All-Pro 'Spike-a-Flat Field standard' illuminated panel
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Number of Dark frames: 50 (from library) Duration: 2 minutes Gain: HDR
Camera Temperature: -20 degrees C Binning: 1x1 F-Stop: 7.0
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Number of Bias frames: 50 (from library) Duration: 0.001 seconds Gain: HDR
Camera Temperature: -20 degrees C Binning: 1x1 F-Stop: 7.0
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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, AutoColor script, BlurXterminator, NoiseXterminator
Non-Linear: GeneralizedHyperbolicStretch script, HistogramTransformation, BlurXterminator, CurvesTransformation, GAME script, CurvesTransformation on background, CurvesTransformation on forground.
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Notes: Clouds limited imaging
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