NGC 2174 & NGC 2175
Common Name: Monkey Head Nebula (NGC 2174)
Also Known as: Sharpless 2-252 (Sh2-252) (NGC 2174) Cr 84 (NGC 2175)
Object Type: Emission Nebula (NGC 2174) and Open Cluster (NGC 2175)
Constellation: Orion
Distance from Earth: 6,400 light years (NGC 2174) ... 6,350 light years (NGC 2175)
Apparent Magnitude: 6.8 (both)
Coordinates: RA 08H 09.7M 0S DEC 20 deg 30 min 0.0 sec
Actual Size: 74.5 light years (NGC 2174), 33 light years (MGC 2175
Apparent Dimensions: 40 arc-minutes (NGC 2174) ... 18 arc-minutes (NGC 2175)
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Environmental Data
Date: January 7, 2021 Start Time: End Time: SQM: 19.89
Moon Age: 23.3 days Moonrise: 0:52AM Moon Illumination: 37.6%
Temperature: 40 degrees F Humidity: 60% Dew Point:
Location: Westport, Massachusetts 02790 Sky Condition: Clear
Comment:
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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: ASTAP Rotator/Control: Pegasus Unity Platform
Imaging Status
Imaging Software: Sequence Generated Focus HFR 1.16 Platesolve: Good on 2nd attempt
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Guide Scope Data
Telescope: Stellarvue SVX130 refractor Camera: Lodestar X2 Focuser: Optec DirectSync SV35
Dew Heater: Kendrick dew strip Software: PHD2 Exposure: 2 sec Binning: 1x1 Tracking Result: 1.2 arc-seconds RMS
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Images Taken
Number of light frames: 130 Duration: 4 minutes Gain: Unity Gain
Camera Temperature: -20 degrees C Binning: 1x1 F-Stop: 5.6
Total Integration Time: 8.66 hours
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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
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Number of Dark frames: 50 (from library) Duration: 4 minutes Gain: Unity Gain
Camera Temperature: -20 degrees C Binning: 1x1 F-Stop: 5.6
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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
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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: DynamicCCrop, AutomaticBackgroundExtraction, ImageSolve, SpectroPhotometricColorCalibration, BlurXterminator, NoiseXterminator, StarXterminator
Non-Linear:
Stars-only image: Histogramtransformation
Starless image: GeneralizedHyperbolicStretch script, RangeSelectMask, HistogramTransformation to darken background, MultiScaleLinearTransform to sharpen, CurvesTransformation
ImageBlend to combine Stars-only and Starless images, DynamicCrop
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Notes:
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