Image subtraction procedure for observing faint asteroids

Details Image subtraction procedure for observing faint asteroids Image subtraction procedure for observing faint asteroids

Mar 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006mpbu...33...16g&link_type=abstract

The Minor Planet Bulletin (ISSN 1052-8091). Bulletin of the Minor Planets Section of the Association of Lunar and Planetary Obse

Physics

Minor Planets, Image Processing

Scientific paper

Main-belt asteroid 46053 was fainter than magnitude 20 when lightcurve observations were made using an amateur telescope and image analysis software commonly used by amateurs. By subtracting images taken more than an hour apart the background stars were reduced to ~1% of their original intensity while preserving the asteroid at 100%. This method for dealing with interfering stars does not require the use of PSF-fitting and it is free of subjective artifacts associated with pixel editing to remove nearby stars. Imperfect matching of image pairs leads to residual systematic errors that vary during an observing session, but their fast-changing nature does not seriously impair the derivation of rotation light curves.

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