The dust coma environment of the short period comets 32P/Comas Solá, 56P/Slaughter-Burnham, and 78P/Gehrels 2 from ground-based observations

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Table 6

Colour indexes for target comets, integrated in the innermost 1.4 × 10⁴ km to minimize effects of the sky background.

Comet	Colour Index (B – V)	Colour Index (V – R)	Colour Index (R – I)

32P/Comas Solá	0.85 ± 0.40	0.51 ± 0.23	0.52 ± 0.18
56P/Slaughter-Burnham	0.85 ± 0.42	0.51 ± 0.29	...
78P/Gehrels 2	0.74 ± 0.21	0.48 ± 0.17	0.39 ± 0.15

SPC nuclei^a	0.82 ± 0.01	0.47 ± 0.01	0.46 ± 0.1

Solar	0.642	0.354	0.332

Notes. The solar colours are those in the modern Johnson-Cousins system (Holmberg et al. 2006).

^(a)

Weighted average of values from the literature, from the compiled list of Lamy et al. 2004 (see their Table 5).

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