Messier 57 (M57)
Common Name: Ring Nebula
Also Known as: NGC 6720
Object Type: Planetary Nebula
Constellation: Lyra
Distance from Earth: 2,300 light years
Apparent Magnitude: 8.8
Coordinates: RA 18H 53M 30.079S DEC 33 deg 01 min 45.03 sec
Actual Size: 2.6 light years in diameter
Apparent Dimensions: 230 arc-minutes x 230 arc-minutes
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Environmental Data
Date: June 5, 2021 Start Time: 8:40PM End Time: 3:29AM SQM: 19.82
Moon Age: 25.1 days Moonrise: 2:52AM Moon Illumination: 20.4%
Temperature: 76 degees F Humidity: 70% Dew Point: 65.5 degrees F
Location: Westport, Massachusetts 02790 Sky Condition: Hazy
Comment: Good PHD2 calibration and Guidance Assitant update
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Imaging Scope Data
Mount: iOptron CEM120 Camera: ZWO ASI071 OSC Focuser: Optec DirectSync SV35
Telescope: Stellarvue SVX130 refractor Focal Length: 910mm
Focal Reducer/Field Flattener: Field Flattener 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 Platesolve: Success on 2nd 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: 2 sec Binning: 1x1 Tracking Result: 0.5 to 1.0 arc-seconds RMS
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Images Taken
Number of light frames: 66 Duration: 2 minutes Gain: Unity Gain
Camera Temperature: 0 degrees C Binning: 1x1 F-Stop: 7.0
Total Integration Time: 2.2 hours
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Number of flat frames: 50 Duration: 0.05 seconds Gain: Unity Gain
Camera Temperature: 0 degrees C Binning: 1x1 F-Stop: 7.0
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Number of Dark frames: 50 (from library) Duration: 2 minutes Gain: Unity Gain
Camera Temperature: 0 degrees C Binning: 1x1 F-Stop: 7.0
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Number of Bias frames: 50 (from library) Duration: 0.001 seconds Gain: Unity Gain
Camera Temperature: 0 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: DynamicCrop, DynamicBackgroundExtraction, ImageSolve, SpectroPhotometricColorCalibration, BlurXTerminator, NoiseXterminator
Non-Linear: GeneralizedHyperbolicStretch script, MultiscaleLinear Transform to sharpen, CurvesTransformation, DynamicCrop.
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Notes:
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