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NEOWISE OBSERVATIONS OF NEAR-EARTH OBJECTS: PRELIMINARY RESULTS

Amy MainzerJet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109 USA; [email protected]T. GravDepartment of Physics and Astronomy, Johns Hopkins University, Baltimore, MD, USAJ. M. BauerInfrared Processing and Analysis Center, California Institute of Technology, Pasadena, CA 91125, USAJ. MasieroJet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109 USA; [email protected]R. S. McMillanLunar and Planetary Laboratory, University of Arizona, 1629 East University Blvd., Tucson, AZ 85721-0092, USAR. M. CutriInfrared Processing and Analysis Center, California Institute of Technology, Pasadena, CA 91125, USAR. G. WalkerMonterey Institute for Research in Astronomy, Monterey, CA, USAE. L. WrightDepartment of Physics and Astronomy, UCLA, P.O. Box 91547, Los Angeles, CA 90095-1547, USAPeter EisenhardtJet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109 USA; [email protected]D. J. TholenInstitute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI, USAT. B. SpahrMinor Planet Center, Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USARobert JedickeInstitute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI, USAL. DenneauInstitute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI, USAE. DeBaunDepartment of Physics and Astronomy, Dartmouth University, Hanover, NH 03755, USAD. ElsburyUniversity of California Santa Barbara, Broida Hall, Santa Barbara, CA 93103, USAT. N. GautierCornell University, Ithaca, NY 14853, USAS. GomillionDepartment of Engineering Physics, Embry-Riddle Aeronautical University, 600 S. Clyde Morris Boulevard, Daytona Beach, FL 32114, USAE. HandDepartment of Mechanical Engineering, University of Missouri-Kansas City, Kansas City, MO 64110, USAWenli MoDepartment of Physics and Astronomy, Johns Hopkins University, Baltimore, MD, USAJ. A. WatkinsAshlee WilkinsDepartment of Astronomy, University of Maryland, College Park, MD 20742, USAGinger BryngelsonDepartment of Physics and Astronomy, Clemson University, 8304 University Station, Clemson, SC 29634, USAAndrés del PinoInstituto de Astrofìsica de Canarias, Vìa Lactea, E38200-La Laguna, Tenerife, Canary Islands, SpainS. DesaiNational Center for Supercomputing Applications, University of Illinois, Urbana-Champagne, 1205 W. Clark St., Urbana, IL 61801, USAM. Gómez CamusDepartmento de Ciencias Fisicas, Facultad de Ingenieria, Universidad Andres Bello, Republica 220, Santiago, ChileS. L. HidalgoInstituto de Astrofìsica de Canarias, Vìa Lactea, E38200-La Laguna, Tenerife, Canary Islands, SpainI. S. KonstantopoulosDepartment of Astronomy and Astrophysics, Penn State University, 525 Davey Lab, University Park, PA 16802, USAJeffrey A. LarsenDepartment of Physics, United States Naval Academy, Annapolis, MD 21402, USAC. MaleszewskiLunar and Planetary Laboratory, University of Arizona, 1629 East University Blvd., Tucson, AZ 85721-0092, USAMatthew A. MalkanDepartment of Physics and Astronomy, UCLA, P.O. Box 91547, Los Angeles, CA 90095-1547, USAJean‐Christophe MauduitInfrared Processing and Analysis Center/Spitzer Science Center, California Institute of Technology, Mail Code 220-6, Pasadena, CA 91125, USAB. MullanDepartment of Astronomy and Astrophysics, Penn State University, 525 Davey Lab, University Park, PA 16802, USAEdward W. OlszewskiSteward Observatory, University of Arizona, Tucson, AZ 85721, USAJ. PforrInstitute of Cosmology and Gravitation, University of Portsmouth, Dennis Sciama Building, Burnaby Road, Portsmouth PO1 3FX, UKA. SaroDepartment of Physics, Ludwig-Maximilians-Universitat, Scheinerstr. 1, 81679, Munich, GermanyJ. V. ScottiLunar and Planetary Laboratory, University of Arizona, 1629 East University Blvd., Tucson, AZ 85721-0092, USAL. H. WassermanLowell Observatory, 1400 W. Mars Hill Road, Flagstaff, AZ 86001, USA

2011en

ABI

Annotatsiya

With the NEOWISE portion of the Wide-field Infrared Survey Explorer (WISE) project, we have carried out a highly uniform survey of the near-Earth object (NEO) population at thermal infrared wavelengths ranging from 3 to 22 Î¼m, allowing us to refine estimates of their numbers, sizes, and albedos. The NEOWISE survey detected NEOs the same way whether they were previously known or not, subject to the availability of ground-based follow-up observations, resulting in the discovery of more than 130 new NEOs. The survey's uniform sensitivity, observing cadence, and image quality have permitted extrapolation of the 428 near-Earth asteroids (NEAs) detected by NEOWISE during the fully cryogenic portion of the WISEmission to the larger population. We find that there are 981 19 NEAs larger than 1km and 20,500 3000 NEAs larger than 100m. We show that the Spaceguard goal of detecting 90% of all 1km NEAs has been met, and that the cumulative size distribution is best represented by a broken power law with a slope of 1.32 0.14 below 1.5km. This power-law slope produces 13, 200 1900 NEAs with D > 140m. Although previous studies predict another break in the cumulative size distribution below D 50-100m, resulting in an increase in the number of NEOs in this size range and smaller, we did not detect enough objects to comment on this increase. The overall number for the NEA population between 100 and 1000m is lower than previous estimates. The numbers of near-Earth comets and potentially hazardous NEOs will be the subject of future work. Â© 2011. The American Astronomical Society. All rights reserved.

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DOI: 10.1088/0004-637x/743/2/156

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