NGC 4449
Also Known as: Caldwell 21, UGC 7592
Object Type: Irregular Magellanic type galaxy
Constellation: Canes Venatici
Distance from Earth: 13.8 million light yeas
Apparent Magnitude: 10.0
Coordinates: RA 12H 28M 11.9S DEC 44 deg 05 min 40 sec
Actual Size: 20,000 light years in diameter
Apparent Dimensions: 6.2 arc-minutes x 4.4 arc-minutes
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Environmental Data
Date: April 8, 2021 Start Time: 8:23PM End Time: 11:24PM SQM: 18.46
Moon Age: 26.3 days Moonrise: 5:09AM Moon Illumination: 11.8%
Temperature: 56 degrees F Humidity: 60% Dew Point: 42 degrees F
Location: Westport, Massachusetts 02790 Sky Condition: Clear
Comment:
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Imaging Scope Data
Mount: iOptron CEM120 Camera: ZWO ASI071 OSC Focuser: Optec QuickSync FT20
Telescope: Celeston 11 inch SCT Edge Focal Reducer: 0.7 Filter: None
Rotator: None Power Control: Dew Heater: Kendrick dew strip
Imaging Software
Mount: iOptron Commander Focuser: Optec FocusLynx Commander
Imaging: Sequence Generator Pro Platesolve: ASTAP Rotator/Control:
Imaging Status
Imaging Software: Sequence generated Focus HFR 1.59 Platesolve: Success 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: 0.4 to 0.9 arc-seconds RMS
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Images Taken
Number of light frames: 82 Duration: 2 minutes Gain: Unity Gain
Camera Temperature: -10 degrees C Binning: 1x1 F-Stop: 7.0
Total Integration Time: 2.73 hours
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Number of flat frames: 50 Duration: 0.13 Gain: Unity Gain
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: 15 Duration: 2 minutes Gain: Unity Gain
Camera Temperature: -10 degrees C Binning: 1x1 F-Stop: 7.0
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Number of Bias frames: 15 Duration: 0.001 seconds Gain: Unity Gain
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: DynamicBackgroundExtraction, ImageSolve, SpectroPhotometricColorCalibration, BlurXTerminator, NoiseXterminator
Non-Linear: GeneralizedHyperbolicStretch script, CurvesTransformation, MultiscaleLinearTransform for sharpening, DynamicCrop
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Notes: Clouds rolled in around 11PM
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