NGC 7788 & NGC 7790 Open Clusters and Sh2-168 Nebula
Also Known as:
Object Type: Open Clusters and Nebula
Constellation: Cassiopeia
Distance from Earth: 5,000 light years (NGC 7788) & 10,800 light years (NGC 7790), 12,000 light years (Sh2-168)
Apparent Magnitude: 9.4 (NGC 7788) & 8.5 (NGC 7790)
Coordinates: RA 23H 56M 0S DEC 61 deg 24 min 00 sec (NGC 7788) ... RA 23H 58M 24.2S DEC 61 deg 12 min 30 sec (NGC 7790)
Actual Size: 5 light years in diameter (NGC 7788) ... 15 light years in diameter (NGC 7790)
Apparent Dimensions: 2.4 arc minutes (NGC 7788) .. 7.4 arc-minutes (NGC 7790)
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Environmental Data
Date: September 15, 2024 Start Time: 8:21PM End Time: 2:51AM SQM: 18.66
Moon Age: 12.5 days Moonset: 2:54AM Moon Illumination: 94.0%
Temperature: 61 degrees F Humidity: 80% Dew Point: 55 degrees F
Location: Westport, Massachusetts 02790 Sky Condition: Clear but bright Moon
Comment: Moon was very bright all night
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Imaging Scope Data
Mount: iOptron CEM120 Camera: ZWO ASI2600 OSC Focuser: Optec DirectSync SVX30
Telescope: Stellarvue SV90 refractor Focal Length: 504mm
Focal Reducer/Field Flattener: 0.8 Filter: IDAS NB-1
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: 1.47 Platesolve: Good on 3rd attempt
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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: 0.6 arc-seconds RMS
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Images Taken
Number of light frames: 91 Duration: 4 minutes Gain: 100
Camera Temperature: 0 degrees C Binning: 1x1 F-Stop: 5.6
Total Integration Time: 6.07 hours
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Number of flat frames: 50 Duration: 0.15 seconds Gain: 100
Camera Temperature: 0 degrees C Binning: 1x1 F-Stop: 5.6
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
Camera Temperature: 0 degrees C Binning: 1x1 F-Stop: 5.6
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Number of Bias frames: 50 (from library) Duration: 0.001 seconds Gain: 100
Camera Temperature: 0 degrees C Binning: 1x1 F-Stop: 5.6
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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: DynamicBackgroundExtraction, ImageSolve, SpectroPhotometricColorCalibration, BlurXTerminator, NoiseXTerminator
Non-Linear: GeneralizedHyperbolicStretch script, CurvesTransformation, HistogramTransformation
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Notes:
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