Physics
Scientific paper
Apr 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012mpbu...39...84w&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
Scientific paper
The near-Earth asteroid 2005 YU55 was observed in a coordinated campaign to obtain photometric data during the object's close approach to Earth in 2011 November. Analysis of more than 2500 data points found two possible synodic periods: P = 19.31 ± 0.02 h, A ± 0.20 ± 0.02 mag and P = 16.34 ± 0.01 h, A = 0.24 ± 0.02 mag. Initial radar observations supported the shorter period but additional review now supports the longer period. In addition to finding a rotation period, the absolute magnitude was found to be H = 21.27 ± 0.05 and phase slope parameter G = ˜0.147 ± 0.014, the latter being consistent with a low albedo. Size estimates based on independent IR and radar observations ranged from ~310 to 400 meters, or ? using H = 21.27 ? yielding albeos in the range of 0.057-0.034.
Brinsfield James W.
Foster John Jr.
Franco Lorenzo
Jacobsen Jens
Larsen Frank R.
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