NGC 4085 & NGC 4088
Also Known as: UGC 7081, PGC 38302 (NGC 4088)
Object Type: Intermediate Spiral Galaxy (NGC 4085, Grand Desing Spiral Galaxy (NGC 4088)
Constellation: Ursa Major
Distance from Earth: 62.6 million light years (NGC 4085), 51.5 million light years (NGC 4088) light years
Apparent Magnitude: 10.137 (NGC 4085), 11.2 (NGC 4088)
Coordinates: RA 12H 06M 39S DEC 50 deg 12 min 44 sec (NGC 4085), RA 12H 05M 34.2S DEC 50 deg 32 min 21 sec (NGC 4088)
Actual Size:
Apparent Dimensions: 2.2 arc-minutes x 0.57 arc-minutes (NGC 4085), 5.8 arc-minutes x 2.2 arc-minutes (NGC 4088)
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Environmental Data
Date: April 9 & April 17 2025 Start Time: 9:42 PM (April 9) 8 PM (April 17) End Time: 3:18 AM both nights SQM: 18.48 (April 9) 17.03 (April 17)
Moon Age: 12.2 days (April 9) 18.6 days (April 17) Moonset: 4:54AM (April 9) 8:07 (April 17) Moon Illumination: 92.7% (April 9) 83.9% (April 17)
Temperature: 36.3 degees F (April 9) 51.4 Degrees (April 17) Humidity: 57% (April 9) 34% (April 17) Dew Point: 22.6 degrees F (April 9) 24.1 degrees (APril 17)
Location: Westport, Massachusetts 02790 Sky Condition: Scattered clouds (April 9)
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: 1960mm
Focal Reducer/Field Flattener: 0.7 focal reducer 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 2.82 (Red) (April 9) HFR 3.44 (Blue) April 17 Platesolve: Success on 3rd attempt
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 (April 9), 0.8 arc-seconds RMS (April 17)
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Images Taken
Number of light frames (LUM): 25 (April 9) 50 (April 17) Duration: 2 minutes Gain: 100
Number of light frames (Red): 30 (April 9) 20 (April 17) Duration: 2 minutes Gain: 100
Number of light frames (green): 30 (April 9) 17 (April 17) Duration: 2 minutes Gain: 100
Number of light frames (Blue): 30 (April 17) Duration: 2 minutes Gain: 100
Camera Temperature: -10 degrees C Binning: 1x1 F-Stop: 7.0
Total Integration Time: 6.73 hours
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Number of flat frames (LUM): 40 Duration: 0.023 Gain:100
Number of flat frames (Red): 40 Duration: 0.073 Gain: 100
Number of flat frames (Green): 40 Duration: 0.043 Gain: 100
Number of flat frames (Blue): 40 Duration: 0.095 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 GradientCorrection, BlurXTerminator, NoiseXterminator
RED/GREEN/BLUE GradientCorrection, LRGBCombination to create color image using only Red/Green/Blue, ImageSolve, SpectroPhotometricColorCalibration, BlurXTerminator, NoiseXterminator
Non-Linear:
LUM: GeneralizedHyperbolicStretch script, MultiScaleLinearTransform to sharpen, HistogramTransformation
COLOR: GeneralizedHyperbolicStretch script, HistogramTransformation
Notes:
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