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 transcript:

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

2 The Bucket Brigade

3 Observed strip of the sky

4 RA Sample Drift Scan

5 Geometry of Scan Across CCD

6 Coordinates on the CCD

7 The Celestial Sphere

8 Declination Degradation

9 Normal Declination Limits

10 Going to Higher Dec. Limits

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

12 Relative Reductions

13 Aberration of Starlight

14 Declination Overlap Errors

15 RA Overlap Errors

16 Precision of scan to scan registration

17 Sources of Errors

18 Reference Star Catalog Errors

19 Schmidt Telescope Errors

20 Dynamic Range

21 Error versus Magnitude

22 Error versus Zenith Distance

23 Precision Limits

24 Accuracy Limits & the Atmosphere

25 Precision Limits & the Atmosphere

26 Precision versus Aperture

27 World’s Largest CCD Cameras Palomar-Quest x2400 Sloan x2048 Megacam x4612 SuprimeCam x cm

28 The Sloan Camera (SDSS)

29 Palomar/Quest Camera

30

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

32

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