Diameters and albedos of three subkilometer near-earth objects derived from spitzer observations

David E Trilling, M. Mueller, J. L. Hora, G. Fazio, T. Spahr, J. A. Stansberry, H. A. Smith, S. R. Chesley, A. K. Mainzer

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Abstract

Near-Earth objects (NEOs) are fragments of remnant primitive bodies that date from the era of solar system formation. At present, the physical properties and origins of NEOs are poorly understood. We have measured thermal emission from three NEOs-(6037) 1988 EG, 1993 GD, and 2005 GL-with Spitzer's IRAC instrument at 3.6, 4.5, 5.8, and 8.0 μm (the last object was detected only at 5.8 and 8.0 μm). The diameters of these three objects are 400, 180, and 160m, respectively, with uncertainties of around 20% (including both observational and systematic errors). For all three the geometric albedos are around 0.30, in agreement with previous results that most NEOs are S-class asteroids. For the two objects detected at 3.6 and 4.5 μm, diameters and albedos based only on those data agree with the values based on modeling the data in all four bands. This agreement, and the high sensitivity of IRAC, shows the promise of the Spitzer Warm Mission for determining the physical parameters for a large number of NEOs.

Original languageEnglish (US)
JournalAstrophysical Journal
Volume683
Issue number2 PART 2
DOIs
StatePublished - 2008
Externally publishedYes

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near Earth objects
albedo
thermal emission
asteroids
systematic errors
solar system
asteroid
physical property
physical properties
fragments
sensitivity
modeling

Keywords

  • Asteroids
  • Minor planets
  • Subject headings: infrared: solar system

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Trilling, D. E., Mueller, M., Hora, J. L., Fazio, G., Spahr, T., Stansberry, J. A., ... Mainzer, A. K. (2008). Diameters and albedos of three subkilometer near-earth objects derived from spitzer observations. Astrophysical Journal, 683(2 PART 2). https://doi.org/10.1086/591668

Diameters and albedos of three subkilometer near-earth objects derived from spitzer observations. / Trilling, David E; Mueller, M.; Hora, J. L.; Fazio, G.; Spahr, T.; Stansberry, J. A.; Smith, H. A.; Chesley, S. R.; Mainzer, A. K.

In: Astrophysical Journal, Vol. 683, No. 2 PART 2, 2008.

Research output: Contribution to journalArticle

Trilling, DE, Mueller, M, Hora, JL, Fazio, G, Spahr, T, Stansberry, JA, Smith, HA, Chesley, SR & Mainzer, AK 2008, 'Diameters and albedos of three subkilometer near-earth objects derived from spitzer observations', Astrophysical Journal, vol. 683, no. 2 PART 2. https://doi.org/10.1086/591668
Trilling, David E ; Mueller, M. ; Hora, J. L. ; Fazio, G. ; Spahr, T. ; Stansberry, J. A. ; Smith, H. A. ; Chesley, S. R. ; Mainzer, A. K. / Diameters and albedos of three subkilometer near-earth objects derived from spitzer observations. In: Astrophysical Journal. 2008 ; Vol. 683, No. 2 PART 2.
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