NGC 7331
Also Known as: Caldwell 30
Object Type: Unbarred Spiral Galaxy
Constellation: Pegasus
Distance from Earth: 39.8 million light years
Apparent Magnitude: 10.4
Coordinates: RA 22H 37M 04.1S DEC 34 deg 24 min 56 sec
Actual Size: 120,000 light years in diameter.
Apparent Dimensions: 10.5 arc-minutes x 3.7 arc-minutes
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Environmental Data
Date: November 8, 2020 Start Time: 6:16PM End Time: 11:27PM
Sky Condition: Clear, 1st phase Moon SQM: 18.54
Temperature: 28 degrees F Humidity: 78% Dew Point: 17 degrees F
Location: Westport, Massachusetts 02790
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: Platesolve 2 Rotator/Control: Pegasus Ultimate Powerbox V2
Imaging Status
Imaging Software: Sequence Generated Focus HFR 1.31 Platesolve: Good 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 Tracking Result: 0.9 arc-seconds RMS
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Images Taken
Number of light frames: 70 Duration: 4 minutes Gain: Unity Gain
Camera Temperature: -10 degrees C Binning: 1x1 F-Stop: 7.0
Total Integration Time: 4.67 hours
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Number of flat frames: 25 Duration: 0.08 seconds Gain: Unity Gain
Camera Temperature: -10 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: 4 minutes Gain: Unity Gain
Camera Temperature: -10 degrees C Binning: 1x1 F-Stop: 7.0
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Number of Bias frames: 50 (from library) Duration: 0.001 seconds Gain: Unity Gain
Camera Temperature: -10 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, DynamicCrop, GAME script to generate mask, MultiScaleLinearTransform to sharpen galaxy, HistogramTransfomation to darken backgound.
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Notes: Noticed some reflections starting at frame 60.
Click Below Image for Full Size:
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