Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.1313p&link_type=abstract
American Astronomical Society, DPS meeting #42, #13.13; Bulletin of the American Astronomical Society, Vol. 42, p.1055
Astronomy and Astrophysics
Astronomy
1
Scientific paper
The binary YORP (BYORP) effect of solar radiation pressure on the orbit of a satellite around a primary orbiting the Sun was predicted by Ćuk and Burns (2005, Icarus 176, 418). McMahon and Scheeres (2010, CMDA 106, 261; Icarus, in press) gave a detailed derivation of the effect and proposed that it can be detected by tracking mean anomaly. We used their theory and scaling with their application to the binary 1999 KW4 for predicting a magnitude of change of the secondary orbit in binary systems using an updated dataset of binary asteroid parameters by Pravec and Harris (2007, Icarus 190, 250). Due to the inverse square-power dependence of the drift in mean anomaly on heliocentric semi-major axis as well as the primary diameter, the effect is largest in the smallest binaries orbiting closest to the Sun, i.e., among small near-Earth asteroid (NEA) binaries. We studied conditions of detectability of the predicted secular quadratic growth in mean anomaly compared to a Keplerian system by observations of mutual events between binary system components. Fits of a binary model to observed mutual events in previous apparitions gave a mean error of the mean anomaly measurements of 2-3 degrees with good-quality photometric observations (errors 0.01-0.02 mag). We identified seven binary NEA systems that are candidates for detection of the BYORP effect with such observations in their next apparitions during 2010-2015: (7088) Ishtar, (65803) Didymos, (66063) 1998 RO1, (88710) 2001 SL9, (137170) 1999 HF1, (175706) 1996 FG3 and (185851) 2000 DP107. Their predicted quadratic growth in mean anomaly is 0.24 to 3.3 deg/yr2. Photometric observations using telescopes with sizes about 2 m and smaller in their apparitions with V < 21 during 2010-2015 will give us data on event epochs in 4-6 apparitions (including their previous observed apparitions), allowing detection of BYORP in them.
Pravec Petr
Scheirich Peter
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