Messier 3 (M3)
Also Known as: NGC 5272
Object Type: Globular Cluster
Constellation: Canes Venatici
Distance from Earth: 33,900 Light years
Apparent Magnitude: 6.2
Coordinates: RA 13H 42M 11.62S DEC 28 deg 22 min 38.2 sec
Actual Size: 180 light years in diameter. The dense core measures 1.1 arc minutes (11 light years).
Apparent Dimensions: 18 arc minutes.
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Environmental Data
Date: April 24, 2019 Start Time: 9:03PM End Time: 10:07 AM SQM: 17.96
Moon Age: 19.8 days Moonrise: 0:13AM Moon Illumination: 74.0%
Temperature: 43 degrees F Humidity: 34% Dew Point: 17 degrees F
Location: Westport, Massachusetts 02790 Sky Condition: Clear
Comment:
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Imaging Scope Data
Mount: Celestron CPC1100 Mount 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: None Power Control: None Dew Heater: Kendrick dew strip
Imaging Software
Mount: Celestron Focuser: Optec FocusLynx Commander
Imaging: Sequence Generator Pro Platesolve: None Rotator/Control: None
Imaging Status
Imaging Software: Sequence Generated Focus Good HFR 3.65 Platesolve:
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Guide Scope Data
Telescope: Stellarvue SV90 refractor Camera: Lodestar X2 Focuser: Optec DirectSync SVX30
Dew Heater: Kendrick dew strip Software: PHD2 Tracking Result: 0.71 arc-seconds RMS
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Images Taken
Number of light frames: 30 Duration: 2 minutes Gain: 100
Camera Temperature: -10 degrees C Binning: 1x1 F-Stop: 7.0
Total Integration Time: 1 hour
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Number of flat frames: 50 Duration: 0.05 seconds 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: GradientCorrection, ImageSolve, SpectroPhotometricColorCalibration, BlurXTerminator, NoiseXterminator
Non-Linear: GeneralizedHyperbolicStretch script, CurvesTransformation for Saturation, MultiScaleLinearTransform to sharpen, Dynamic Crop, HistogramTransform to darken backgound
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Notes:
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