Differential CCD photometry of faint asteroids in crowded star fields and nonphotometric sky conditions

Details Differential CCD photometry of faint asteroids in crowded star fields and nonphotometric sky conditions Differential CCD photometry of faint asteroids in crowded star fields and nonphotometric sky conditions

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aj.....93.1264w&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 93, May 1987, p. 1264-1267.

Astronomy and Astrophysics

Astronomy

9

Asteroids, Astronomical Photometry, Charge Coupled Devices, Solar Orbits, Star Distribution, Reference Stars, Telescopes, Tracking (Position), Asteroids, Astronomy, Photometry, Earth-Based Observations, Ccd Methods, Rotation, Period, Procedure, Mars Crossers, Zomba, Amplitude, Mette, Hungaria Asteroids, Lightcurves, Equipment

Scientific paper

The authors demonstrate that the use of an imaging CCD detector array allows photometric observations of comparatively faint asteroids moving rapidly through a complex background of star images. They have been able to alleviate the shortage of observing time by taking advantage of the presence of comparison stars that are observed simultaneously on the CCD imaging area and at small angular separations from the asteroid. These reference stars allow the effects of thin cirrus clouds or haze to be compensated to a degree adequate for the acquisition of scientifically original data. The Mars-crossing asteroid 1468 Zomba, of diameter 8 km, is found to have a rotation period of 2.77 hr and an amplitude of 0.3 mag, as observed on 1986 March 20 and 21 UT. The Hungaria asteroid 1727 Mette, of diameter 7 km, has a rotation period of 2.63 hr. The amplitude of photometric variation was 0.3 mag on 1986 June 11, 12, 13, and 30 UT.

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