Messier 90 (M90)
Also Known as: NGC 4569, Arp 76
Object Type: Spiral Galaxy
Constellation: Virgo
Distance from Earth: 58.7 million light years
Apparent Magnitude: 10.26
Coordinates: RA 12H 36M 49.8S DEC 13 deg 09 min 46 sec
Actual Size: 165,000 light years in diameter
Apparent Dimensions: 9.5 arc-minutes x 4.4 arc-minutes
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Environmental Data
Date: May 21, 2020 Start Time: 10:46PM End Time: 2:23AM SQM: 18.30
Moon Age: 28.5 days Moonset: 7:04PM Moon Illumination: 1.2%
Temperature: 60 degrees F Humidity: 60% Dew Point: 46 degrees F
Location: Westport, Massachusetts 02790 Sky Condition: Clear, high clouds
Comment:
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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: None Power Control: None Dew Heater: Kendrick dew strip
Imaging Software
Mount: iOptron Commander Focuser: Optec FocusLynx Commander
Imaging: Sequence Generator Pro Platesolve: Platesolve2 Rotator/Control:
Imaging Status
Imaging Software: Sequence Generated Focus HFR 1.93 Platesolve: Success on 2nd attempt
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Guide Scope Data
Telescope: Stellarvue SV90 refractor Camera: Lodestar X2 Focuser: Optec DirectSync SVX30
Dew Heater: Kendrick dew strip Software: PHD2 Tracking Result: 1.13 arc-seconds RMS with spikes from wind
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Images Taken
Number of light frames: 55 Duration: 2 minutes Gain: Unity Gain
Camera Temperature: -10 degrees C Binning: 1x1 F-Stop: 7.0
Total Integration Time: 1.83 hours
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Number of flat frames: 20 Duration: 0.08 seconds Gain: Unity Gain
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: Unity Gain
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: Unity Gain
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: DynamicCrop, DynamicBackgroundExtraction, ImageSolve, SpectroPhotometricColorCalibration, BlurXTerminator, NoiseXterminator
Non-Linear: GeneralizedHyperbolicStretch script, MultiscaleLinearTransform for sharpening, HistogramTransformation, DynamicCrop.
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Notes:
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