NGC 3613 & NGC 3619
Also Known as: UGC 6323, PGC 34583 (NGC 3613), UGC 6330, PGC 34641 (NGC 3619)
Object Type: Elliptical Galaxy (NGC 3613), Unbarred Lenticular Galaxy (NGC 3619)
Constellation: Ursa Major
Distance from Earth: 98 million light years (NGC 3613), 87 million light years (NGC 31619)
Apparent Magnitude: 11.6 (NGC 3613), 12.6 (NGC 3619)
Coordinates: RA 11H 18M 36.130 Sec DEC 57 deg 59 min 59.73 sec (NGC 3613), RA 11H 19M 21.621 Sec DEC 57 deg 45 min 27.66 sec (NGC 3619)
Actual Size: 38,000 light years (NGC 3613), 98,450 light years (NGC 3619)
Apparent Dimensions: 1.347 arcminutes x 0.997 arcminutes (NGC3613), 3.89 arcminutes x 3.08 arcminutes (NGC 3619)
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Environmental Data
Date: June 1, 2026 Start Time: 9:32 PM End Time: 1.56 AM SQM: 18.92
Moon Age: 15.3 days Moonset: 4:46 AM Moon Illumination: 99.4%
Temperature: 50.4 degrees F Humidity: 68% Dew Point: 40.3 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 2.89 Platesolve: Success on 3th 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: 0.49 t0 0.8 arcseconds RMS
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Images Taken
Number of light frames (LUM): 38 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: 3.77 hours
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Number of flat frames (LUM): 25 Duration: 0.12 Gain:100
Number of flat frames (Red): 25 Duration: 0.38 Gain: 100
Number of flat frames (Green): 25 Duration: 0.26 Gain: 100
Number of flat frames (Blue): 25 Duration: 0.26 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: 2/5 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, BLUE sets
Linear - Background extraction, Color correction, deconvolution, noise reduction:
LUM GraXpert, BlurXTerminator, NoiseXterminator.
RED/GREEN/BLUE GraXpert, ChannelCombine to create color image using only Red/Green/Blue, BlurXTerminator, NoiseXterminator, Image Solver script, SpectroPhotometricColorCalibration
Non-Linear:
LUM: MultiscaleAdaptiveStretch, MultiscaleLinearTransform to smooth image.
Color:MultiscaleAdaptiveStretch, MultiscaleLinearTransform to smooth image.
ImageBlend script to combine LUM and COLOR/Narrowband masters, CurvesTransformation to darken background and increase color saturation
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Notes:
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