NGC 6749

Also Known as: Berkeley 42, GLC 107, GC 4466, h 2029

Object Type: Globular Cluster

Constellation: Aquila

Distance from Earth: 25,000 light years

Apparent Magnitude: 12.4

Coordinates: RA 19H 05M 15.3 Sec DEC 1 deg 54 min 05 sec

Actual Size: 36 light years

Apparent Dimensions: 5 arcminutes

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Environmental Data

Date: June 24, 2026     Start Time: 9:59 PM    End Time: 2:57 AM    SQM: 18.51

Moon Age: 10.1 days     Moonset: 1:10 AM     Moon Illumination: 77.7%

Temperature: 71.2 degrees F    Humidity: 61%    Dew Point: 57 degrees F

Location: Westport, Massachusetts 02790    Sky Condition: Clear

Comment: Rebalanced scope slightly then ran PHD2 Guidance assist and PHD2 calibration

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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 4.75     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: 0.85-1.2 arc-seconds RMS

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Images Taken

Number of light frames (LUM): 70        Duration: 2 minutes        Gain: 100        

Number of light frames (Red): 20        Duration: 2 minutes        Gain: 100        

Number of light frames (green): 20        Duration: 2 minutes        Gain: 100        

Number of light frames (Blue): 20        Duration: 2 minutes        Gain: 100        

Camera Temperature: 0 degrees C        Binning: 1x1        F-Stop: 10.0        

Total Integration Time: 4.33 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, BLUE, 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, ChannelCombine to create color image using only Red/Green/Blue, BlurXTerminator, NoiseXterminator, Image Solver script, SpectroPhotometricColorCalibration

Non-Linear: LUM: MultiscaleAdaptiveStretch
Color:MultiscaleAdaptiveStretch, CurvesTransformation to enhance blue channel
ImageBlend script to combine LUM and COLOR/Narrowband masters, BlemishBlaster to remove artifact, GAME script, MultiScaleLinearTransform to sharpen cluster, CurvesTransformation to darken background and increase color saturation

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Notes:

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