Optical and thermal infrared observations of six near-Earth asteroids in 2002

Details Optical and thermal infrared observations of six near-Earth asteroids in 2002 Optical and thermal infrared observations of six near-Earth asteroids in 2002

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005icar..175...92w&link_type=abstract

Icarus, Volume 175, Issue 1, p. 92-110.

Physics

15

Scientific paper

We present thermal infrared photometry and spectrophotometry of six Near-Earth Asteroids (NEAs) using the 3.8 m United Kingdom Infrared Telescope (UKIRT) together with quasi-simultaneous optical observations of five NEAs taken at the 1.0 m Jacobus Kapteyn Telescope (JKT). For Asteroid (6455) 1992 HE we derive a rotational period P=2.736±0.002 h, and an absolute visual magnitude H=14.32±0.24. For Asteroid 2002 HK12 we derive H=18.22(+0.37,-0.30). The Standard Thermal Model (STM), the Fast Rotating Model (FRM) and the Near-Earth Asteroid Thermal Model (NEATM) have been fitted to the measured fluxes to derive albedos and effective diameters. The derived geometric albedos and effective diameters are (6455) 1992 HE: p=0.26±0.08, D=3.55±0.5 km; 1999 HF1: p=0.18±0.07, D=3.73(+1.0,-0.5) km; 2000 ED104: p=0.18±0.05, D=1.21±0.2 km; 2002 HK12: p=0.24(+0.25,-0.11), D=0.62±0.2 km; 2002 NX18: p=0.031±0.009, D=2.24±0.3 km; 2002 QE15: p=0.15(+0.08,-0.06), D=1.94±0.4 km. The limitations of using the NEATM to observe NEAs at high phase angles are discussed.

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