Fig. 6
Spectral slope versus perihelion distance, where a weak trend of steeper slopes at larger distances is found. Data taken from the MBOSS colour database (Hainaut et al. 2012). The red filled circle and the blue symbols correspond to the spectral slope of the spectrum of 2P/Encke and the observed asteroids, respectively, determined in this work (wavelength range Δλ = 420–750 nm).
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