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- W72671493 abstract "Introduction: The currently known distribution of rotation periods of Near-Earth Objects (NEOs) shows a remarkable separation between objects larger and smaller than ~150 meters. All objects larger than ~150 meters with measured periods (with a single known exception) rotate more slowly than the 2.2 h rubblepile limit, while at smaller diameters a significant population of faster rotating objects appears. The fast rotators are under centrifugal tension, and may or may not be monolithic [1]. The spin rate distribution of all small NEOs has been significantly affected by the YORP effect [2 and references therein]. Consequently, the detailed distribution in rotation period, size, and light curve amplitude is an important constraint on both material properties and the role of radiation-recoil torques. Observational Program: In 2006 a program of NEO photometry was initiated at the 2.4-meter telescope at the MDM Observatory on Kitt Peak, with the intent of searching for fast-rotating asteroids (FRAs) in the diameter range from ~20 to ~800 meters. Target NEOs with H > 19 and V 0.05 mag in good observing conditions. Results: To date, 39 NEOs have been observed in the absolute magnitude range 25.7 > H > 18.3. Of these, only 5 are definite fast rotators, with periods between 0.037 h and 1.8 h. Figure 1 shows these objects in the period-diameter plane, along with the objects for which we obtain the most secure lower limits on period. We find no fast-rotating objects in the several-hundred-meter transition region, where strengthdominated objects may be expected to appear [1]. We find an abundance of slowly rotating objects, with P > 10 h, for 21 23), however, we find that at least 3 out of 6 (50%) are detected as FRAs, compared with 7% for the larger objects. This may indicate that for objects smaller than ~80 meters, YORP may dominate over all other torques. Figure 1. Distribution of NEOs in the absolute magnitude-rotation period plane, from the Warner & Harris catalog. Diameter scale along the top axis is computed assuming spherical objects with an albedo of 0.18. Small points indicate previously measured objects; squares and limits are from this work. The two points connected by a line indicate an object where the factor of 2 ambiguity in period cannot be resolved from the light curve." @default.
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- W72671493 date "2008-01-01" @default.
- W72671493 modified "2023-10-05" @default.
- W72671493 title "The Rotation Rate Distribution of Small Near-Earth Objects" @default.
- W72671493 hasPublicationYear "2008" @default.
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