NGC 6939 & NGC 6946
Common Name: Fireworks Galaxy (NGC 6946)
Also Known as: NGC 6939 Melotte 231, NGC 6946 Caldwell 12, UGC 11597
Object Type: Open Cluster (NGC 6939), Intermediate Spiral Galaxy (NGC 6946)
Constellation: Boundary of Cepheus and Cygnus
Distance from Earth: 3,830 light years (NGC 6939), 25.2 million light years (NGC 6946)
Apparent Magnitude: 7.8 (NGC 6939), 9.6 (NGC 6946)
Coordinates: RA 20H 31M 30S DEC 60 deg 39 min 42 sec (NGC 6939), RA 20H 34M 52.3S DEC 60 deg 09 min 14 sec (NGC 6946)
Actual Size: 87,300 light years in diameter (NGC 6946)
Apparent Dimensions: 7 arc-minutes (NGC 6939), 16 arc-minutes x 11.2 arc-minutes (NGC 6946)
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Environmental Data
Date: August 2, 2021 Start Time: 9:20PM End Time: 3:22AM SQM: 15.03
Moon Age: 23.9 days Moonrise: 0:34AM Moon Illumination: 32.1%
Temperature: 66 degrees F Humidity: 60% Dew Point:
Location: Westport, Massachusetts 02790 Sky Condition: Clear
Comment:
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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: None
Rotator: Pegasus Falcon rotator Power Control: Pegasus Ultimate Powerbox V2 Dew Heater: Kendrick dew strip
Imaging Software
Mount: iOptron Commander Focuser: Optec FocusLynx Commander
Imaging: Sequence Generator Pro Platesolve: ASTAP Rotator/Control: Pegasus Utnity Platform
Imaging Status
Imaging Software: Sequence generated Focus HFR 1.4 Platesolve: Success on 2nd attempt
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Guide Scope Data
Telescope: Stellarvue SV90 refractor Camera: ZWO ASI290 Focuser: Optec DirectSync SVX30
Dew Heater: Kendrick dew strip Software: PHD2 Exposure: 1 sec Binning: 1x1 Tracking Result: 0.6 arc-seconds RMS
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Images Taken
Number of light frames: 160 Duration: 2 minutes Gain: 100
Camera Temperature: 0 degrees C Binning: 1x1 F-Stop: 7.0
Total Integration Time: 5.33 hours
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Number of flat frames: 50 Duration: 0.03 Gain: 100
Camera Temperature: 0 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 Duration: 2 minutes Gain: 100
Camera Temperature: 0 degrees C Binning: 1x1 F-Stop: 7.0
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Number of Bias frames: 50 Duration: 0.001 seconds Gain: 100
Camera Temperature: 0 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, ImageSolve, SpectroPhotometricColorCalibration, BlurXTerminator, NoiseXterminator
Non-Linear: GeneralizedHyperbolicStretch script, CurvesTransformation, StarReduction script
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Notes:
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