NGC 2237
Common Name: Rosette Nebula
Also Known as: Sharpless 2-275, Caldwell 49, Skull Nebula
Object Type: Emission Nebula
Constellation: Monoceros
Distance from Earth: 5,200 light years
Apparent Magnitude: 9.0
Coordinates: RRA 06H 33M 45S DEC 04 deg 59 min 54 sec
Actual Size: 130,000 light years in diameter
Apparent Dimensions: 1.3 degrees
--------------------------------------------------------------------------
Environmental Data
Date: December 10, 2020 Start Time: End Time: SQM: 19.89
Moon Age: 24.9 days Moonrise: 1:52AM Moon Illumination: 22.6%
Temperature: 40 degrees F Humidity: 60% Dew Point: 27 degrees F
Location: Westport, Massachusetts 02790 Sky Condition: Clear
Comment: PHD2 good calibration
--------------------------------------------------------------------------
Imaging Scope Data
Mount: iOptron CEM120 Camera: ZWO ASI071 OSC Focuser: Optec DirectSync SVX30
Telescope: Stellarvue SV90 refractor Focal Length: 504mm
Focal Reducer/Field Flattener: 0.8 Filter: None
Rotator: Manual Power Control: Dew Heater: Kendrick dew strip
Imaging Software
Mount: iOptron Commander Focuser: Optec FocusLynx Commander
Imaging: Sequence Generator Pro Platesolve: Platesolve 2 Rotator/Control: Pegasus Unity Platform
Imaging Status
Imaging Software: Sequence Generated Focus HFR 1.21 Platesolve: Good on 2nd attempt
--------------------------------------------------------------------------
Guide Scope Data
Telescope: Stellarvue SVX130 refractor Camera: Lodestar X2 Focuser: Optec DirectSync SV35
Dew Heater: Kendrick dew strip Software: PHD2 Tracking Result: 1.2 arc-seconds RMS
--------------------------------------------------------------------------
Images Taken
Number of light frames: 87 Duration: 4 minutes Gain: Unity Gain
Camera Temperature: -20 degrees C Binning: 1x1 F-Stop: 5.6
Total Integration Time: 5.8 hours
--------------------------------------------------------------------------
Number of flat frames: 50 Duration: 0.04 Gain: Unity Gain
Camera Temperature: -20 degrees C Binning: 1x1 F-Stop: 5.6
Flat Field Illumination: All-Pro 'Spike-a-Flat Field standard' illuminated panel
--------------------------------------------------------------------------
Number of Dark frames: 50 (from library) Duration: 4 minutes Gain: Unity Gain
Camera Temperature: -20 degrees C Binning: 1x1 F-Stop: 5.6
--------------------------------------------------------------------------
Number of Bias frames: 50 (from library) Duration: 0.001 seconds Gain: Unity Gain
Camera Temperature: -20 degrees C Binning: 1x1 F-Stop: 5.6
--------------------------------------------------------------------------
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: Gradient, ImageSolve, SpectroPhotometricColorCalibration, BlurXterminator, NoiseXterminator, DynamicCrop, StarXterminator
Non-Linear:
Stars Only Image: HistogramTransformation
Starless image only: GeneralizedHyperbolicStretch script, CurvesTransformation, MultiScaleLinearTransform to sharpen
ImageBlend to combine stars-only and starless images, CurvesTransformation, HistogramTransformation.
--------------------------------------------------------------------------
Notes:
Click Below Image for Full Size:
Click to Return to Home Page