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2 AUTOSTAR CCD PHOTOMETRY
3. Practicing Photometry – Once you have mastered the imaging
steps, you are ready to practice photometry. Pick some stars that
are high in the sky when they cross the meridian. The closer to the
zenith, the better. The further from the meridian the poorer quality
the images will be and thus poorer photometry. Try to plan your
observing so that the star is to the East of the meridian and will
cross during the observing session.
4. Take multiple sets of images of a star field with a Program
and a Comparison star. Be sure to save the images as FITS. If you
save the images as a JPG or GIF or other than a FITS format, you
cannot do photometry on the image.
5. Practice getting data from a single image until you get
consistent magnitude values. The values should repeat exactly for
the same image. This may require investigation into the profile of
the star image and adjusting the Aperture and Annulus settings.
(These settings are discussed in later sections.)
6. Practice getting data from several images of the same star
field taken near the same time and with the same filter. The
magnitude data on the individual stars should be the same between
images. Most likely, the data will not be the same at first. Work to
find out why and how to minimize the differences.
7. Once you have repeatable data and are confident in knowing
what you are doing, start some serious photometry.
The following chapters describe suggested procedures for using a
Meade
®
Deep Sky Imager (DSI)™ Pro or DSI Pro-II monochrome
CCD camera with the AutoStar Suite™ and Envisage software.
Note: Aside from the specific steps involved in taking images with
the DSI camera, once images have been acquired with most any
CCD camera and stored as standard FITS files, the AutoStar Suite
Image Processing software can be used, and the rest of the
instructions for photometry also apply.
- 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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