The Open UniversitySkip to content

Thermal infrared and optical observations of four near-Earth asteroids

Wolters, Stephen; Green, Simon F.; McBride, Neil and Davies, John K. (2008). Thermal infrared and optical observations of four near-Earth asteroids. Icarus, 193(2) pp. 535–552.

Full text available as:
PDF (Not Set) - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
Download (424kB)
DOI (Digital Object Identifier) Link:
Google Scholar: Look up in Google Scholar


We present thermal infrared photometry and spectrophotometry of four near-Earth asteroids (NEAs), namely (433) Eros, (66063) 1998 RO1, (137032) 1998 UO1, and (138258) 2000 GD2, using the United Kingdom Infrared Telescope (UKIRT) in 2002. For two objects, i.e. (433) Eros and (137032) 1998 UO1, quasi-simultaneous optical observations were also obtained, using the Jacobus Kapteyn Telescope (JKT). For (127032) 1998 UO1, we obtain a rotation period P=3.0±0.1 h and an absolute visual magnitude HV=16.7±0.4. The Standard Thermal Model (STM), Fast Rotating Model (FRM) and near-Earth asteroid Thermal Model (NEATM) have been fitted to the IR fluxes to determine effective diameters Deff, geometric albedos pv, and beaming parameters ?. The derived values are (433) Eros: Deff=23.3±3.5 km (at lightcurve maximum), pv=0.24±0.07, ?=0.95±0.19; (66063) 1998 RO1: Deff = 0.62 (+0.25, -0.09) km, pv = 0.30 (+0.09, -0.17); (137032) 1998 UO1: Deff<1.13 km, pv>0.29; (138258) 2000 GD2: Deff=0.27±0.04 km, pv = 0.56 (+0.32,-0.22), ?=0.74±0.15. (66063) 1998 RO1 is a binary asteroid from lightcurve characteristics [Pravec, P., and 56 colleagues, 2006. Icarus 181, 63–93] and we estimate the effective diameter of the primary (Dp) and secondary (Ds) components. The diameter and albedo of (138258) 2000 GD2 are consistent with the trend of decreasing diameter for S- and Q-type asteroids found by Delbó et al. [Delbó, M., Harris, A.W., Binzel, R.P., Pravec, P., Davies, J.K., 2003. Icarus 166, 116–130]. A possible trend of increasing beaming parameter with diameter for small (less than about 3 km) S- and Q-type asteroids is found.

Item Type: Journal Item
ISSN: 0019-1035
Keywords: Asteroids; Thermal infrared spectrometry and spectrophotometry; Near-Earth asteroids
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 10790
Depositing User: Stephen Wolters
Date Deposited: 06 Jun 2008
Last Modified: 04 Sep 2017 05:20
Share this page:


Download history for this item

These details should be considered as only a guide to the number of downloads performed manually. Algorithmic methods have been applied in an attempt to remove automated downloads from the displayed statistics but no guarantee can be made as to the accuracy of the figures.

Actions (login may be required)

Policies | Disclaimer

© The Open University   + 44 (0)870 333 4340