Table 3
Colour indices of the 67P/C-G nucleus as determined from the photometric observations in April 2004 and July 2007.
| V − R [mag] | R − I [mag] | B − R [mag] | φ | Reddening [%/1000 Å] | |
|
|
|||||
| April 2004 | 0.50 ± 0.04 | 0.51 ± 0.04 | – | 0.2 | |
| 0.55 ± 0.05 | 0.47 ± 0.05 | – | 0.3 | ||
| 0.53 ± 0.03 | 0.47 ± 0.03 | – | 0.5 | ||
| 0.53 ± 0.04 | – | – | 0.7 | ||
|
|
|||||
| average | 0.53 ± 0.02 | 0.49 ± 0.02 | – | 12 ± 2 | |
|
|
|||||
| July 2007 | 0.54 ± 0.05 | 0.45 ± 0.04 | 1.37 ± 0.06 | 0.7⋆, 0.1⋄ | |
| – | 0.47 ± 0.06 | – | 0.7⋆, 0.1⋄ | ||
|
|
|||||
| average | 0.54 ± 0.05 | 0.46 ± 0.04 | 1.37 ± 0.06 | 10 ± 2•, 11 ± 2† | |
Notes. φ is the rotational phase at which the V,I, and B filter images, which we used to determine the corresponding colour indices, were taken. July 2007 dataset: The rotational phase with regard to rotational periods belonging to group 1 is marked by ⋆, while the one with regard to rotational periods belonging to group 2 is marked by ⋄. The average colour indices and the corresponding mean spectral reddening of 67P/C-G are shown. For April 2004 the mean spectral reddening was calculated in the wavelength range 5450–7970 Å. In July 2007, in addition to the one relative to the wavelength range 5450–7970 Å (marked by •), thanks to observations also in B filter we determined the mean spectral reddening also in the wavelength range 4360–7970 Å (marked by †).
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