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We obtained N-band observations of the Apollo asteroid 2002 NY40 during itsclose Earth fly-by in August 2002 with TIMMI2 at the ESO 3.6 m telescope. Thephotometric measurement allowed us to derive a radiometric diameter of0.28+/-0.03 km and an albedo of 0.34+/-0.06 through the near-Earth asteroidthermal model (NEATM) and a thermophysical model (TPM). The values are inagreement with results from radar data, visual and near-IR observations. Inthis first comparison between these two model approaches we found that theempirical NEATM beaming parameter $\eta$=1.0 corresponds to a thermal inertiavalues of about 100 $\mathrm{J m^{-2} s^{-0.5} K^{-1}}$ for a typical range ofsurface roughness, assuming an equator-on viewing angle. Our TPM analysisindicated that the surface of 2002 NY40 consists of rocky material with a thinor no dust regolith. The asteroid very likely has a prograde sense of rotationwith a cold terminator at the time of our observations. Although both modelapproaches can fit the thermal spectra taken at phase angles of 22$^{\circ}$and 59$^{\circ}$, we did not find a consistent model solution that describesall pieces of photometric and spectroscopic data. In addition to the 2002 NY40analysis, we discuss the possibilities to distinguish between different modelswith only very few photometric and/or spectroscopic measurements spread over arange of phase angles.Comment: 6 pages, 4 figures, A&A accepte

Thermal infrared observations of near-Earth asteroid 2002 NY40