@article{fe196f71b05149c880cdfc0836ee3754,
title = "Physical modeling of near-Earth Asteroid (29075) 1950 DA",
abstract = "Near-Earth Asteroid (29075) 1950 DA may closely encounter Earth in 2880. The probability of Earth impact may be as high as 1/300, but the outcome of the encounter depends critically on the physical properties of the asteroid [Giorgini et al., 2002. Science 196, 132-136]. We have used Arecibo and Goldstone radar data and optical lightcurves to estimate the shape, spin state, and surface structure of 1950 DA. The data allow two distinct models. One rotates prograde and is roughly spheroidal with mean diameter 1.16 ± 0.12 km. The other rotates retrograde and is oblate and about 30% larger. Both models suggest a nickel-iron or enstatite chondritic composition. Ground-based observations should be able to determine which model is correct within the next several decades.",
keywords = "Asteroids, composition, dynamics, Near-Earth objects, Radar observations, rotation",
author = "Busch, {Michael W.} and Giorgini, {Jon D.} and Ostro, {Steven J.} and Benner, {Lance A.M.} and Jurgens, {Raymond F.} and Randy Rose and Hicks, {Michael D.} and Petr Pravec and Peter Kusnirak and Ireland, {Michael J.} and Scheeres, {Daniel J.} and Broschart, {Stephen B.} and Christopher Magri and Nolan, {Michael C.} and Hine, {Alice A.} and Margot, {Jean Luc}",
note = "Funding Information: We thank the Arecibo and Goldstone technical and support staffs for help with the radar observations. The Arecibo Observatory is part of the National Astronomy and Ionosphere Center, which is operated by Cornell University under a cooperative agreement with the National Science Foundation. The work at Ond{\v r}ejov was supported by the Grant Agency of the Czech Republic, Grant 205-99-0255. C. Magri was partially supported by NSF grant AST-0205975. Some of this work was performed at the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration (NASA). This material is based in part upon work supported by NASA under the Science Mission Directorate Research and Analysis Programs. We thank Shrinivas Kulkarni, Jean Mueller and Alicia Soderberg at Caltech and David Tholen at the University of Hawaii for assistance with the Palomar observations.",
year = "2007",
month = oct,
doi = "10.1016/j.icarus.2007.03.032",
language = "English (US)",
volume = "190",
pages = "608--621",
journal = "Icarus",
issn = "0019-1035",
publisher = "Academic Press Inc.",
number = "2",
}