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Table 3:

Color indices of asteroid 21 Lutetia.
Filters (U-B) (B-V) (V-R) (R-I)
(F16-F24) 0.22 $\pm$ 0.02 0.68 $\pm$ 0.02    
(F16-F23) 0.21 $\pm$ 0.02 0.67 $\pm$ 0.02    
(F24-F23)   0.68 $\pm$ 0.02    
(F24-F22)     0.38 $\pm$ 0.02  
(F24-F28)     0.38 $\pm$ 0.02  
(F23-F22)     0.39 $\pm$ 0.02  
(F23-F28)     0.39 $\pm$ 0.02  
(F22-F28)       0.32 $\pm$ 0.02
(F22-F51)       0.31 $\pm$ 0.02
(F22-F41)       0.32 $\pm$ 0.02
Mean values 0.22 $\pm$ 0.01 0.68 $\pm$ 0.01 0.39 $\pm$ 0.01 0.32 $\pm$ 0.01
Sun 0.19 0.65 0.35 0.28
PDS 0.19 $\pm$ 0.02 0.69 $\pm$ 0.03    
Z+75 0.19 $\pm$ 0.03 0.72 $\pm$ 0.01    
L+83   0.67 $\pm$ 0.02    
D+00   0.68 $\pm$ 0.02    
B+10   0.65 $\pm$ 0.01 0.42 $\pm$ 0.01 0.34 $\pm$ 0.01

Notes. The first block of data gives the individual color indices calculated from the various combinations of NAC filters used to derive the UBVRI magnitudes. The second block gives the corresponding mean values of the indices and those of the Sun for comparison. The third block gives results found in the literature: PDS = Planetary Data System; Z+75 = Zellner et al. (1975); L+83 = Lupishko et al. (1983); D+00 = Denchev (2000); B+10 = Belskaya et al. (2010).


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