Messier 71 (M71)
Also Known as: NGC 6838
Object Type: Globular Cluster
Constellation: Sagitta
Distance from Earth: 13,000 light years
Apparent Magnitude: 6.1
Coordinates: RA 19H 53M 46.49S DEC 18 deg 46 min 45.1 sec
Actual Size: 27 light years in diameter
Apparent Dimensions: 7.2 arc-minutes
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Environmental Data
Date: October 4, 2023 Start Time: 7:56PM End Time: 11:48PM SQM: 15.11
Moon Age: 20.1 days Moonrise: 9:33PM Moon Illumination: 71.7%
Temperature: 72 degrees F Humidity: 81% Dew Point: 66 degrees F
Location: Westport, Massachusetts 02790 Sky Condition: Clear
Comment: Late in the night fog rolled in.
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Imaging Scope Data
Mount: iOptron CEM120 Camera: ZWO ASI2600 OSC Focuser: Optec QuickSync FT20
Telescope: Celestron 11 inch SCT Edge Focal Length: 1960mm
Focal Reducer/Field Flattener: 0.7 focal reducer Filter: None
Rotator: Pegasus Falcon Power Control: Pegasus Ultimate Powerbox V2 Dew Heater: Kendrick dew strip
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 3rd attempt
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Guide Scope Data
Telescope: Stellarvue SV90 refractor Camera: ZWO ASI290 Focuser: Optec DirectSync SVX30
Dew Heater: Kendrick dew strip Software: PHD2 Exposure: 1 sec Binning: 1x1 Exposure: 2 sec Binning: 1x1 Tracking Result: 0.55 arc-seconds RMS
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Images Taken
Number of light frames: 103 Duration: 2 minutes Gain: 100
Camera Temperature: -10 degrees C Binning: 1x1 F-Stop: 7.0
Total Integration Time: 3.43 hours
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Number of flat frames: 50 Duration: 0.05 seconds Gain: 100
Camera Temperature: -10 degrees C Binning: 1x1 F-Stop: 7.0
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
Camera Temperature: -10 degrees C Binning: 1x1 F-Stop: 7.0
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Number of Bias frames: 50 (from library) Duration: 0.001 seconds Gain: 100
Camera Temperature: -10 degrees C Binning: 1x1 F-Stop: 7.0
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Imaging Processing
Imaging Processing Software: PixInsight
Processes utilized: Linear - calibration/integration: Flats ImageCalibration with Master Bias, Flat ImageIntegration, Images ImageCalibration with Flat Master & Dark Master, Debayer, SubFrameSelector, StarAlign, ImageIntegration
Linear - Background extraction, Color correction, deconvolution, noise reduction: GradientCorrection, ImageSolve, SpectroPhotometricColorCalibration, BlurXTerminator, NoiseXterminator
Non-Linear: GeneralizedHyperbolicStretch script, CurvesTransformation for saturation, HistgramTransformation, DynamciCrop
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Notes:
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