|
|
Photometry
|
|
|
1. You observe a star at 500nm with a telescope in space that consists of 3 mirrors and 1 CCD. Estimate the fraction detected / emitted photons using information from the lecture "Calibrating Wide-Field Imaging Instruments".
|
|
|
2. Estimate the same fraction if the telescope were located on Paranal.
|
|
|
Astrometry
|
|
|
3. You observe a star with a telescope in space that has zero instrumental distortion, but a badly manufactured focal plane array of a quadrant of 9 detectors. The detectors are rotated by up to 5 degrees relative to each other. Devise a calibration method to determine the relative rotation of all detectors relative to the central detector using on-sky observations of a stellar cluster with hundreds of stars covering the field-of-view of the detectors and with known positions in (ra,dec). |