Differential Photometry is comparing the difference between a target star and a comparison star. This is most usefulin Time Series observations.
The direct comparison of a target and comparison star in the same field of view eliminates all other observationalvariables leaving a direct, differential comparison. Example: light pollution.
IMPORTANT: This process does NOT derive an absolute magnitude measure, but instead provides differential/relativemagnitude changes.
To accomplish this, we use Aperture Photometry.
NOTE: If you have not viewed this lesson, pause and review itbefore proceeding here.
- Understanding Aperture Photometry
- Understanding what a Comparison Star is
- Stellar Magnitudes
- Image Calibration