NGC 147 & NGC 185
Also Known as: Caldwell 17 (NGC 147) ... Caldwell 18 (NGC 185)
Object Type: Dwarf Spheroidal Galaxies
Constellation: Cassiopeia
Distance from Earth: 2.56 million light years (NGC 147)... 2.05 million light years (NGC185)
Apparent Magnitude: 10.5 (NGC 147) .... 9.2 (NGC 185)
Coordinates: RA 00H 33M 12.1S DEC 48 deg 30 min 32 sec (NGC 147) .. RA 00H 38M 57.97S DEC 48deg 20min 14.56sec (NGC 185)
Actual Size: 4,400 light year in diameter (NGC 147) .. 10,000 light years in diameter (NGC 185)
Apparent Dimensions: 13.2 arc-minutes x 7.8 arc-minutes (NGC 147) ... 11.7 arc-minutes x 10.9 arc-minutes (NGC 185)
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Environmental Data
Date: October 17, 2021 Start Time: 7:46PM End Time: 11:06PM SQM: 18.52
Moon Age: 12.4 days Moonset: 3:38AM Moon Illumination: 93.5%
Temperature: 58 degrees F Humidity: 68% Dew Point: 48 degrees F
Location: Westport, Massachusetts 02790 Sky Condition: Partly cloudy
Comment: PHD2 drift alignment completed. PHD2 calibration good. PHD2 Guiding Assistant utilized to update guiding parameters.
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Imaging Scope Data
Mount: iOptron CEM120 Camera: ZWO ASI2600 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 Unity Platform
Imaging Status
Imaging Software: Sequence Generated Focus HFR 1.35 Platesolve: Good on 3rd attempt
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Guide Scope Data
Telescope: Stellarvue SV90 refractor Camera: Lodestar Focuser: Optec DirectSync SVX30
Dew Heater: Kendrick dew strip Software: PHD2 Exposure: 1 sec Binning: 1x1 Tracking Result: 0.5 arc-seconds RMS
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Images Taken
Number of light frames: 84 usable Duration: 2 minutes Gain: 100
Camera Temperature: -10 degrees C Binning: 1x1 F-Stop: 7.0
Total Integration Time: 2.8 hours
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Number of flat frames: 50 Duration: 0.08 Gain: 100
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: 100
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: 100
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, NoiseXTerminator
GeneralizedHyperbolicStretch script, CurvesTransformation
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Notes: Clouds on and off all night, very cloudy after 11PM.
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