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ROUNDING UP THE UNUSUAL SUSPECTS
1Palmer Divide Observatory, 17995 Bakers Farm Rd., Colorado Springs, CO 80908.
Abstract:
The results of analysis of CCD photometric observations for seven Hungaria asteroids are reported: 3873 Roddy, 7187 Isobe, (7247) 1991 TD1, 8348 Bhattacharyya, (25332) 1999 KK6, (30311) 2000 JS10, and (67175) 2000 BA19. Of this group, 3873 Roddy and 7187 Isobe, are considered to be new discoveries of small binary (D < 10 km) systems. This brings the total of known Hungaria binaries to 16. (7247) 1991 TD1 also resembles a binary object, but there are concerns with this conclusion because the second period is almost commensurate with an Earth day. It is a low-amplitude object with ambiguous period solutions. 8348 Bhattacharyya may be an example of an asteroid with a spin axis nearly in the ecliptic plane, which results in low amplitude lightcurves that are difficult to analyze. (25332) 1999 KK6 showed some evidence of a binary nature but it is more likely due to a trait of Fourier analysis. (30311) 2000 JS10 is another example where the Fourier analysis may have been led astray. (67175) 2000 BA19 also shows signs of a secondary period, but of 275 h. This would make it one of small number of objects that show two periods, one of ~2.2-2.5 h, and the other of 200 h or more.
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