Fig. 2.

Ratio of reflected to total flux in the WISE short-wavelength bands W1 (top row) and W2 (bottom row) vs. heliocentric distance predicted by the NEATM for different values of visible geometric albedo (pV), and beaming parameter (η) increasing from left to right. A typical value of 1.4 was chosen for the infrared relative reflectance or albedo ratio (RX ≡ pX/pV, with X = W1, W2; see, e.g., Alí-Lagoa et al. 2013 for more details). All other things being equal, a higher η means a lower surface temperature and hence a higher reflected light contribution. For main-belt asteroids, the average η-value is 1.0.
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