NGC 7635
Common Name: Bubble Nebula
Also Known as: Sharpless 162 (Sh2-162), Caldwell 11
Object Type: Emission Nebula
Constellation: Cassiopeia
Distance from Earth: 7,100 light years
Apparent Magnitude: 10.0
Coordinates: RA 22H 20M 48.3S DEC 61 deg 12 min 06 sec
Actual Size: 7 light years in diameter.
Apparent Dimensions: 15 arc-minutes x 8 light years
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Environmental Data
Date: September 6, 2021 Start Time: 8:17PM End Time: 3:47AM SQM: 19.10
Moon Age: 29.2 days Moonset: 7:26PM Moon Illumination: 0.3%
Temperature: 73 degrees F Humidity: 72% Dew Point: 63 degrees F
Location: Westport, Massachusetts 02790 Sky Condition: Clear
Comment:
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Imaging Scope Data
Mount: iOptron CEM120 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: 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 Unity Platform
Imaging Status
Imaging Software: Sequence Generated Focus HFR: 2.27 Platesolve: Good on 3rd 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: 2 sec Binning: 1x1 Tracking Result: 0.6 arc-seconds RMS
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Images Taken
Number of light frames: 198 Duration: 2 minutes Gain: Unity Gain
Camera Temperature: -10 degrees C Binning: 1x1 F-Stop: 7.0
Total Integration Time: 6.6 hours
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Number of flat frames: 50 Duration: 0.12 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: 2 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, namicBackgroundExtraction, ImageSolve, SpectroPhotometricColorCalibration, BlurXTerminator, NoiseXterminator, StarXterminator
Non-Linear:
Stars-only image: HistogramTransformation
Staless image: GeneralizedHyperbolicStretch script, MultiScaleLinearTransform to sharpen, CurvesTransformation
PixelMath to combine Stars-only and Starless images
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Notes:
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