NGC 7253
Also Known as: Arp 278, UGC 11984 & 11985, PGC 68572 & 68573
Object Type: Galaxies
Constellation:Pegasus
Distance from Earth: 200 million light years
Apparent Magnitude: 13.2 and 14.3
Coordinates: RA 22H 19M 28.9S DEC 29deg 23min 30.0sec
Actual Size: 135,000 light years & 71,400 light years
Apparent Dimensions: 1.7 arc-minutes x 0.8 arc-minutes & 1.6 arc-minutes x 0.5 arc-minutes
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Environmental Data
Date: September 19, 2025 Start Time: 8:12PM End Time: 4:15AM SQM: 19.66
Moon Age: 27.2 days Moonrise: 3:38AM Moon Illumination: 5.8%
Temperature: 73 degrees F Humidity: 66 Dew Point: 61 degrees F
Location: Westport, Massachusetts 02790 Sky Condition: Clear
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 3.05 Platesolve: Success on2nd attempt
Guide Scope Data
Telescope: Stellarvue SVX130 refractor Camera: ZWO ASI290 Focuser: Optec DirectSync SV35
Dew Heater: Kendrick dew strip Software: PHD2 Exposure: 2 sec Binning: 1x1 Tracking Result: 0.7 arc-seconds RMS
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Images Taken
Number of light frames (LUM): 98 Duration: 2 minutes Gain: 100
Number of light frames (Red): 30 Duration: 2 minutes Gain: 100
Number of light frames (Green): 30 Duration: 2 minutes Gain: 100
Number of light frames (Blue: 30 Duration: 2 minutes Gain: 100
Camera Temperature: 0 degrees C Binning: 1x1 F-Stop: 10.0
Total Integration Time: 6.27 hours
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Number of flat frames (LUM): 0 Duration: 0.04 Gain:100
Number of flat frames (Red): 0 Duration: 0.12 Gain: 100
Number of flat frames (Green): 0 Duration: 0.083 Gain: 100
Number of flat frames (Blue): 0 Duration: 0.16 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
RED/GREEN/BLUE DynamicCrop, GraXpert, ChannelCombination to create color image using only Red/Green/Blue, ImageSolve, SpectroPhotometricColorCalibration, BlurXTerminator, NoiseXterminator
Non-Linear:
LUM: GeneralizedHyperbolicStretch script, MultiscaleLinearTransform to sharpen
COLOR: GeneralizedHyperbolicStretch script, HistogramTransformation to darken background, CurvesTransformation to enhance saturation
ImageBlend of Luminance and color images, GAME mask, MultiscaleLinearTransform to sharpen galaxy, DynamicCrop.
Notes:
Click Below Image for Full Size:
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