NGC 7142
Also Known as: Cr 442
Object Type: Open Cluster
Constellation: Cygnus
Distance from Earth: 6,200 light years
Apparent Magnitude: 9.3
Coordinates: RA 21H 45M 10S DEC 65 deg 46 min 18 sec
Actual Size:
Apparent Dimensions: 9.6 arcminutes
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Environmental Data
Date: August 11, 2025 Start Time: 8:59PM End Time: 2:38AM SQM: 18.86
Moon Age: 16.8 days Moonrise: 9:07PM Moon Illumination: 92.6%
Temperature: 78.6 degrees F Humidity: 65% Dew Point: 66 degrees F
Location: Westport, Massachusetts 02790 Sky Condition: Hazy
Comment:
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Imaging Scope Data
Mount: iOptron CEM120 Camera: ZWO ASI2600 monochrome Focuser: Optec QuickSync FT20
Telescope: Celestron 11 inch SCT Edge Focal Length: 1960mm
Focal Reducer/Field Flattener: 0.7 focal reducer Dew Heater: Kendrick dew strip
Filter Wheel : ZWO EFW 7 position 2 inch Filter(s): Baader Lum CMOS optimized 2 inch, Baader RED CMOS optimized 2 inch, Baader GREEN CMOS optimized 2 inch, Baader BLUE CMOS optimized 2 inch
Rotator: Pegasus Falcon 2 Power Control: Pegasus Ultimate Powerbox V2
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 2.39 Platesolve: Success on 3rd attempt
Guide Scope Data
Telescope: Stellarvue SVX130 refractor Camera: ZWO ASI290 Focuser: Optec DirectSync SV35
Dew Heater: Kendrick dew strip Software: PHD2 Exposure: 2 sec Binning: 1x1 Tracking Result: 0.55 arc-seconds RMS
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Images Taken
Number of light frames (LUM): 30 Duration: 2 minutes Gain: 100
Number of light frames (Red): 40 Duration: 2 minutes Gain: 100
Number of light frames (Green): 45 Duration: 2 minutes Gain: 100
Number of light frames (Blue: 40 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 (LUM): 0 Duration: 0.027 Gain:100
Number of flat frames (Red): 0 Duration: 0.082 Gain: 100
Number of flat frames (Green): 0 Duration: 0.054 Gain: 100
Number of flat frames (Blue): 0 Duration: 0.12 Gain: 100
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: 100
Number of Bias frames: 50 (from library) Duration: 0.001 seconds Gain: 100
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Imaging Processing
Imaging Processing Software: PixInsight
Processes utilized: Linear - calibration/integration:
For each of the LUM, RED, GREEN, and BLUE lights: Flats ImageCalibration with Master Bias, Flat ImageIntegration, Images ImageCalibration with Flat Master & Dark Master, SubFrameSelector
StarAlign all calibrated lights using best LUM image as reference, ImageIntegration of each of the LUM, RED, GREEN, and BLUE sets
Linear - Background extraction, Color correction, deconvolution, noise reduction:
LUM DynamicCrop, GraXpert, BlurXTerminator, NoiseXterminator
RED/GREEN/BLUE DynamicCrop, GraXpert, ChannelCombination to create color image using only Red/Green/Blue, ImageSolve, SpectroPhotometricColorCalibration, BlurXTerminator, NoiseXterminator
Non-Linear:
LUM: GeneralizedHyperbolicStretch script
COLOR: GeneralizedHyperbolicStretch script, SCNR to remove slight green cast, CurvesTransformation to increase saturation, HistogramTransformation to darken background
Notes: Luminance master not used in final image
Click Below Image for Full Size:
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