Sharpless 154 & 155 (Sh2-154 & Sh2-155)
Common Name: Cave Nebula (Sh2-155)
Also Known as: Caldwell 9 (Sh2-155)
Object Type: Diffuse Nebula
Constellation: Cepheus
Distance from Earth: 3,260 Light Years (Sh2-154) .... 2,400 Light years (Sh2-155)
Apparent Magnitude: 7.7 (Sh2-155)
Coordinates: RA 22H 51M 51.97S DEC 61 deg 13 min 29.5 sec (Sh2-154) ....RA 22H 57M 17.14S DEC 62 deg 28 min 33.4 sec (Sh2-155)
Actual Size: 70 light years in diameter (Sh2-155)
Apparent Dimensions: 50 arc-minutes x 30 arc-minutes (Sh2-155)
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Environmental Data
Date: September 13, 2024 Start Time: 7:58PM End Time: 4:03AM SQM: 18.04
Moon Age: 10.2 days Moonset: 0:24AM Moon Illumination: 78.0%
Temperature: 70 degrees F Humidity: 80% Dew Point: 65 degrees F
Location: Westport, Massachusetts 02790 Sky Condition: Very murky
Comment:
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Imaging Scope Data
Mount: iOptron CEM120 Camera: ZWO ASI2600 OSC Focuser: Optec DirectSync SVX30
Telescope: Stellarvue SV90 refractor Focal Length: 504mm
Focal Reducer/Field Flattener: 0.8 Filter: IDAS NB-1
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 1.45 Platesolve: Success on 3rd attempt
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Guide Scope Data
Telescope: Stellarvue SVX130 refractor Camera: ZWO ASI290 Focuser: Optec DirectSync SV35
Dew Heater: Kendrick dew strip Software: PHD2 Exposure: 2 sec Binning: 1x1 Tracking Result: ~0.55 arc-seconds RMS
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Images Taken
Number of light frames: 110 Duration: 4 minutes Gain: 100
Camera Temperature: 0 degrees C Binning: 1x1 F-Stop: 5.6
Total Integration Time: 7.33 hours
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Number of flat frames: 50 Duration: 0.3 seconds Gain: 100
Camera Temperature: 0 degrees C Binning: 1x1 F-Stop: 5.6
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Number of Dark frames: 50 (from library) Duration: 4 minutes Gain: 100
Camera Temperature: 0 degrees C Binning: 1x1 F-Stop: 5.6
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Number of Bias frames: 50 (from library) Duration: 0.001 seconds Gain: 100
Camera Temperature: 0 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: GradientCorrection, ImageSolve, SpectroPhotometricColorCalibration, BlurXterminator, NoiseXterminator, StarXterminator
Non-Linear:
Stars only image: HistogramTransformation
Starless image only: GeneralizedHyperbolicStretch script, MultiscaleLinearTransform for smoothing
ImageBlend to combine stars only and starless images, MultiscaleLinearTransform for smoothing, CurvesTransformation.
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Notes:
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