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AUTOSTAR CCD PHOTOMETRY 87

Plotting a Graph and Drawing the Straight Line

Figure F–1 shows a manually-plotted line used to determine the

slope (b) and Y–intercept (a) values.

Figure F–1. Manual Data Plot.

From the Graph:

Slope: b = ΔY / ΔX = –0.725 / 2 = –0.3625

ΔY / ΔX means the change (delta) in Y divided by the change

in X.

Y-Intercept: a = 0.825

1 2 ... 92 93 94 95 96 97 98 99 100 101 102 ... 127 128

AutoStar 1
CCD Photometry 1
TABLE OF CONTENTS 5
LIST OF FIGURES 8
LIST OF FIGURES (Contd.) 9
LIST OF TABLES 10
1. Introduction 11
2. Data Acquisition 13
2.3 Setting Directories 15
2.4 Taking Dark Frames 16
2.5 Taking Star Images 18
2.5.1 Imaging Procedure 18
Figure 2-13 22
DSI1 Folder Tab 22
Figure 2-14 22
Tracking Star Selection Box 22
2.5.2 Flat Frames 25
3. Raw Data Reduction 27
3.2 Calibrating the Images 28
3.3 Differential Magnitudes 31
Centering Box Size Settings 34
3.4 ImageInfo File 36
4. Additional Data Reduction 37
4.2 DATA LIST 38
5. Advanced Data Reduction 39
APPENDIXES 41
APPENDIX A 43
Modifying the DSI Pro Camera 43
Filter Wheel 46
CCD Photometric Filters 47
Cooling the DSI Pro 49
TEC Cooler Mods 50
Parts List 51
Wiring and Schematics 53
Conclusion 54
Optional Accessories 54
APPENDIX B 55
Calculating the Air Mass 55
Getting Started 56
Star's Declination (δ) 57
LST Example 62
Determining the Air Mass 63
Appendix C 65
APPENDIX D 69
Terms and Definitions 70
Equations 70
– V). In 71
APPENDIX E 77
Observational Data 78
Coefficient Calculation 80
Standard Star Magnitudes 82
Coefficient Determination 85
Determining β and ζ 87
Determining γ and ζ 89
Determining ε and ζ 90
Determining μ and ζ 92
APPENDIX F 95
Least Squares Method 95
APPENDIX G 99
FITS Header 99
Header Details 100
APPENDIX H 101
Light Box Construction Notes 102
Plans and Further Details 105
HPO Light Box 105
Suggested Projects 109
APPENDIX I 109
Solar Photometry 110
Planetary Photometry 110
Comet Photometry 111
Stellar Photometry 111
Nova and Supernova Photometry 112
Asteroid Photometry 112
APPENDIX J 113
References 113
Web Resources 114
INDEX (Contd.) 118

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