Messier 1 (M1)
Common Name: Crab Nebula
Also Known as: NGC 1952, Sharpless 242, LBN 833, 3C 144
Object Type: Supernova Remnant
Constellation: Taurus
Distance from Earth: 6,523 light years
Apparent Magnitude: 8.4
Coordinates: RA 5H 34M 32S DEC +22 deg 0 min 52 sec
Actual Size: 11 light years in diameter.
Apparent Dimensions: 420 arc-minutes x 290 arc-minutes.
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Environmental Data
Date: December 12, 2021 Start Time: 6:49PM End Time: 2:15 AM SQM: 18.99
Moon Age: 9.2 days Moonset: 0:32AM Moon Illumination: 69.1%
Temperature: 44 degrees F Humidity: 68% Dew Point: 34 degrees F
Location: Westport, Massachusetts 02790 Sky Condition: Clear
Comment: Wind shield attached to West side of observatory to mitigate slight wind
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Imaging Scope Data
Mount: iOptron CEM120 Camera: ZWO ASI2600 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: 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 3.41 Platesolve: Good on 2nd attempt
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Guide Scope Data
Telescope: Stellarvue SVX130 refractor Camera: Lodestar X2 Focuser: Optec DirectSync SV35
Dew Heater: Kendrick dew strip Software: PHD2 Exposure: 2 sec Binning: 1x1 Tracking Result: 0.45 arc-seconds RMS
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Images Taken
Number of light frames: 202 Duration: 2 minutes Gain: 100
Camera Temperature: -20 degrees C Binning: 1x1 F-Stop: 7.0
Total Integration Time: 6.73 hours
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Number of flat frames: 50 Duration: 0.13 seconds Gain: 100
Camera Temperature: -20 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: -20 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: -20 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: DynamicBackgroundExtraction, ImageSolve, SpectroPhotometricColorCalibration, BlurXTerminator, NoiseXTerminator
Non-Linear: GeneralizedHyperbolicStretch script, MultiscaleLinearTransform for sharpening, CurvesTransformation, Dynamic Crop
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Notes:
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