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1 Time-Delayed Integration/ Drift scanning William van Altena Yale University Basic Astrometric Methods Yale University July 18-22, 2005.

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Presentation on theme: "1 Time-Delayed Integration/ Drift scanning William van Altena Yale University Basic Astrometric Methods Yale University July 18-22, 2005."— Presentation transcript:

1 1 Time-Delayed Integration/ Drift scanning William van Altena Yale University Basic Astrometric Methods Yale University July 18-22, 2005

2 2 The Bucket Brigade

3 3 Observed strip of the sky

4 4 RA Sample Drift Scan

5 5 Geometry of Scan Across CCD

6 6 Coordinates on the CCD

7 7 The Celestial Sphere

8 8 Declination Degradation

9 9 Normal Declination Limits

10 10 Going to Higher Dec. Limits

11 11 star track star trail North South West East 25.0 cm 19.3 cm Drift-scanning

12 12 Relative Reductions

13 13 Aberration of Starlight

14 14 Declination Overlap Errors

15 15 RA Overlap Errors

16 16 Precision of scan to scan registration

17 17 Sources of Errors

18 18 Reference Star Catalog Errors

19 19 Schmidt Telescope Errors

20 20 Dynamic Range

21 21 Error versus Magnitude

22 22 Error versus Zenith Distance

23 23 Precision Limits

24 24 Accuracy Limits & the Atmosphere

25 25 Precision Limits & the Atmosphere

26 26 Precision versus Aperture

27 27 World’s Largest CCD Cameras Palomar-Quest 112 600x2400 Sloan 30 2048x2048 Megacam 36 2048x4612 SuprimeCam 10 2048x4096 19 cm

28 28 The Sloan Camera (SDSS)

29 29 Palomar/Quest Camera

30 30

31 31 Orion Nebula Driftscan: BRI-composite, 140-sec exposure Palomar Quest

32 32

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