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Photometric Reductions

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Abstract

The minimalist approach outlined above can yield observations reasonably close to a standard system. An important part of the process is to keep extinction effects to a minimum by measuring the reference and target fields when their air mass values are within 0.1 of each other. Also, be sure that you use reference and comparisons that are similar in color to the target.

To see why this latter point is important, assume that your system has a V transform of −0.150*(V–R). If you use a star that has a (V–R) value 1.0 m different from that of the asteroid, then there will be a 0.15 m error in your reduced value. If you keep the difference to 0.1 m, then the error is 0.015 m. This is more acceptable but shows why this approach is probably good to no better than 0.03–0.05 m for absolute precision. In many cases, this is adequate if working by yourself and trying to merge data from one night to the next. If you’re trying to merge data from other observers, the more formal approach should be used.

Keywords

  • Color Index
  • Standard System
  • Minimalist Approach
  • Comparison Star
  • Reference Field

These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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© 2006 Springer Science+Business Media, Inc.

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(2006). Photometric Reductions. In: A Practical Guide to Lightcurve Photometry and Analysis. Springer, New York, NY. https://doi.org/10.1007/0-387-33391-6_5

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