Object M81/M82 30.12.2016
Table of Contents
1 Equipment
| Telescope | GSO 6" F/5 Newton-Reflektor OTA 150/750mm |
| Mount | Celestron AVX |
| Camera | Canon 700D |
| Coma corrector | Baader MPCC Mark III |
| Autoguiding telescope | TS-Optics 60/240mm |
| Autoguiding camera | ZW Optical ASI 130MM |
| Barlow lens 2x | none |
| Focal reducer 0.5x | none |
| Dithering | no |
| Guiding software | OpenPHDGuiding (https://github.com/OpenPHDGuiding) |
| Imaging software | DeepSkyTools (https://bitbucket.org/tstibor/deepskytools) |
| Processing software | PixInsight (http://www.pixinsight.com, https://github.com/PixInsight) |
2 Astroimaging Data
| Type | Format | Number | Exposure Time (sec) | Total Size (MB) | Download Link |
|---|---|---|---|---|---|
| science | CR2 | 30 | 180 | 576 | science.2016.12.30.m81.m82.tar.xz |
| dark | CR2 | 24 | 180 | 415 | dark.2016.12.30.m81.m82.tar.xz |
| bias | CR2 | 59 | 1/4000 | 1007 | bias.2016.12.30.m81.m82.tar.xz |
| flat | CR2 | 42 | 1/250 | 982 | flat.2016.12.30.m81.m82.tar.xz |
| processed | XISF | 1 | 30 * 180 | 155 | processed.2016.12.30.m81.m82.xisf.xz |
| processed | FITS | 1 | 30 * 180 | 49 | processed.2016.12.30.m81.m82.fits.xz |
3 Processed and Annotated Images
Figure 1: Processed Astroimaging Data of Object M81/M82
Figure 2: Processed Astroimaging Data of Object M81/M82 Inverted
Figure 3: Processed Astroimaging Data of Object M81/M82 with Annotation
Figure 4: Processed Astroimaging Data of Object M81/M82 Inverted with Annotation
Figure 5: Download and Investigate Image in FITS format (e.g. in Aladin or DS9)
4 3D Image Renditions
Figure 6: 3D Plot Image Renditions
5 PixInsight Processing Steps
5.1 Linear
- Batch Preprocessing (Calibration & Registration)
- Automatic Background Extractor (Background Modelization)
- Background Neutralization
- Color Calibration
- Image Solver (Astrometry)
5.2 Non-Linear
- MultiScaleLinear Transform (Noise Reduction)
- Histogram Stretch
- Color Saturation
6 PixInsight Camera and Image Statistics
6.1 DSLR Sensor Parameter Output
=============================
DSLR Sensor Parameters v0.0.7
=============================
Camera: Canon EOS REBEL T5i
ISO speed: 800
Image Size: 5208 x 3476
Bias frames exposure time: 1/4098 sec
Flat frames exposure time: 1/256 sec
Dark frames exposure time: 179.8 sec
Light frames exposure time: 180 sec
Channel order: []
Gain per channel(e/ADU): [ 0.292, 0.284, 0.284, 0.296 ]
ISO for unit gain: [ 234, 227, 227, 237 ]
Read Noise(e): [ 3.72, 3.59, 3.53, 3.79 ]
Dark Current (e/pixel/sec) [ 0.0067, 0.0057, 0.006, 0.0062 ]
Dark Current (e/pixel/sec) [ 0.0062, 0.0129, 0.0062, 0.0069 ]
Dark Current (e/pixel/sec) [ 0.0065, 0.0137, 0.0066, 0.0074 ]
Dark Current (e/pixel/sec) [ 0.0079, 0.0066, 0.0068, 0.0075 ]
Dark Current (e/pixel/sec) [ 0.0078, 0.0074, 0.0067, 0.007 ]
Dark Current (e/pixel/sec) [ 0.0075, 0.008, 0.0072, 0.0073 ]
Dark Current (e/pixel/sec) [ 0.0078, 0.0083, 0.0074, 0.0074 ]
Dark Current (e/pixel/sec) [ 0.0081, 0.0081, 0.0067, 0.0073 ]
Dark Current (e/pixel/sec) [ 0.0093, 0.008, 0.0079, 0.0103 ]
Dark Current (e/pixel/sec) [ 0.0095, 0.0085, 0.0082, 0.0106 ]
Dark Current (e/pixel/sec) [ 0.0094, 0.0084, 0.0086, 0.0091 ]
Dark Current (e/pixel/sec) [ 0.0089, 0.0089, 0.0085, 0.0091 ]
Dark Current (e/pixel/sec) [ 0.0101, 0.0096, 0.0091, 0.0096 ]
Dark Current (e/pixel/sec) [ 0.0108, 0.0103, 0.0093, 0.011 ]
Dark Current (e/pixel/sec) [ 0.0115, 0.0113, 0.0112, 0.0111 ]
Dark Current (e/pixel/sec) [ 0.0125, 0.0122, 0.0113, 0.0123 ]
Dark Current (e/pixel/sec) [ 0.0125, 0.0128, 0.0118, 0.0129 ]
Dark Current (e/pixel/sec) [ 0.0136, 0.0134, 0.0128, 0.0138 ]
Dark Current (e/pixel/sec) [ 0.0161, 0.0141, 0.0132, 0.0147 ]
Dark Current (e/pixel/sec) [ 0.0159, 0.0145, 0.0141, 0.0167 ]
Dark Current (e/pixel/sec) [ 0.0175, 0.0165, 0.0147, 0.0173 ]
Dark Current (e/pixel/sec) [ 0.019, 0.0196, 0.0169, 0.0185 ]
Dark Current (e/pixel/sec) [ 0.0195, 0.0204, 0.0172, 0.0188 ]
Noise estimates for 180sec exposure
Read Noise(e): [ 3.72, 3.59, 3.53, 3.79 ]
Thermal Noise(e): [ 1.87, 1.92, 1.76, 1.84 ]
Skyfog Noise(e): [ 6.32, 7.92, 7.9, 6.27 ]
Mean values in ADU
Bias Frame 1: [2045.9, 2047.7, 2046.8, 2048.1 ]
Bias Frame 2: [2047.1, 2047.9, 2047.4, 2047.8 ]
Flat Frame 1: [4728.4, 5909.4, 5901.9, 3689 ]
Flat Frame 2: [4730.9, 5913.9, 5906.1, 3690.8 ]
Dark Frame 1: [ 2045.7, 2046.8, 2046.2, 2046.6 ]
Dark Frame 24: [ 2044.8, 2046.5, 2045.2, 2045.1 ]
Light Frame 1: [2181.7, 2266.8, 2265.1, 2178 ]
Light Frame 2: [2178.6, 2261.1, 2259.4, 2174.4 ]
DSLR Sensor Parameters v0.0.7 Completed.
6.2 FlatSNREstimator
| Images | Flat1, Flat2, Bias1 |
|---|---|
| Foreground quantile | 20% |
| Signal | 3244.69 DN |
| Temporal noise | 100.35 DN |
| SNR | 32.3 |
| Gain | 0.322 e-/DN |
Figure 7: Generated Flat Mask
6.3 FlatContourPlot
| Image | Flat1 |
|---|---|
| Resolution | 50% |
| Sigma | 1.0 px |
| Contours | 15 |
| Gradient | 50% |
Figure 8: Generated Flat Contour Plot Single Image
Figure 9: Generated Flat Contour Plot Image Integration
6.4 FWHMEccentricity
| Model function | Gaussian |
|---|---|
| Log(star detection sensitivity) | -1.00 |
| Upper limit | 1.000 |
| Median FWHM | 3.499 px |
| Median eccentricity | 0.4705 |
| Median residual | 1446 DN |
| Model function | Moffat4 |
|---|---|
| Log(star detection sensitivity) | -1.00 |
| Upper limit | 1.000 |
| Median FWHM | 3.236 px |
| Median eccentricity | 0.4690 |
| Median residual | 1402 DN |