NGC 4217 and NGC 4226
Also Known as: PGC 39241, UGC 7282 (NGC 4217)
Object Type: Spiral Galaxies
Constellation: Canes Venatici
Distance from Earth: 61.1 million light years (NGC 4217), 339 to 394 million light years (NGC 4226)
Apparent Magnitude: 12.4 (NGC 4217), 14 (NGC 4226)
Coordinates: RA 12H 15M 50.9S DEC 47 deg 05 min 30.44 sec (NGC 4217), RA 12H 16M 26.3S DEC 47 deg 01 min 32 sec (NGC 4226)
Actual Size: 89,000 light years (NGC 4217), 99,000 light years (NGC 4226)
Apparent Dimensions: 5.012 arcminutes x 1.479 arcminutes (NGC 4217), 1.0 arcminutes x 0.5 arcminutes (NGC 4226)
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Environmental Data
Date: May 4, 2026 Start Time: 8:50 PM End Time: 1:46 AM SQM: 17.92
Moon Age: 16.9 days Moonset: 6:06AM Moon Illumination: 94.7%
Temperature: 51.4 degrees F Humidity: 58% Dew Point: 34.9 degrees F
Location: Westport, Massachusetts 02790 Sky Condition: Clear but windy. Installed wind shields on East & West walls.
Comment:
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Imaging Scope Data
Mount: iOptron CEM120 Camera: ZWO ASI2600 monochrome Focuser: Optec QuickSync FT20
Telescope: Celestron 11 inch SCT Edge Focal Length: 2800mm
Focal Reducer/Field Flattener: None Dew Heater: Kendrick dew strip
Filter Wheel : ZWO EFW 7 position 2 inch Filter(s): Baader Lum CMOS optimized 2 inch, Baader RED CMOS optimized 2 inch, Baader GREEN CMOS optimized 2 inch, Baader BLUE CMOS optimized 2 inch
Rotator: Pegasus Falcon 2 Power Control: Pegasus Ultimate Powerbox V2
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 3.72 Platesolve: Success on 4th 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: 1 sec Binning: 1x1 Tracking Result: ~0.55 arc-seconds RMS
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Images Taken
Number of light frames (LUM): 60 Duration: 2 minutes Gain: 100
Number of light frames (Red): 25 Duration: 2 minutes Gain: 100
Number of light frames (Green): 25 Duration: 2 minutes Gain: 100
Number of light frames (Blue): 25 Duration: 2 minutes Gain: 100
Camera Temperature: 0 degrees C Binning: 1x1 F-Stop: 10.0
Total Integration Time: 4.5 hours
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Number of flat frames (LUM): 0 Duration: 0.12 Gain:100
Number of flat frames (Red): 0 Duration: 0.38 Gain: 100
Number of flat frames (Green): 0 Duration: 0.26 Gain: 100
Number of flat frames (Blue): 0 Duration: 0.49 Gain: 100
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
Number of Bias frames: 50 (from library) Duration: 0.001 seconds Gain: 100
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Imaging Processing
Imaging Processing Software: PixInsight
Processes utilized: Linear - calibration/integration:
For each of the LUM, RED, GREEN, and BLUE lights: Flats ImageCalibration with Master Bias, Flat ImageIntegration, Images ImageCalibration with Flat Master & Dark Master, SubFrameSelector
StarAlign all calibrated lights using best LUM image as reference, ImageIntegration of each of the LUM, RED, GREEN, and BLUE sets
Linear - Background extraction, Color correction, deconvolution, noise reduction:
LUM DynamicCrop, GraXpert, BlurXTerminator, NoiseXterminator, BlemishBlaster script to remove blemish.
RED/GREEN/BLUE DynamicCrop, GraXpert, ChannelCombine to create color image using only Red/Green/Blue, BlurXTerminator, NoiseXterminator, BlemishBlaster script to remove blemish, Image Solver script, SpectroPhotometricColorCalibration
Non-Linear:
LUM: MultiscaleAdaptiveStretch, CurvesTransformation
Color:MultiscaleAdaptiveStretch, CurvesTransformation
ImageBlend script to combine LUM and COLOR masters, CurvesTransformation to darken background and increase color saturation, HDRMultiScaleTransform to increase dynamic range
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Notes:
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