How good is amateur
data?
An eye and a CCD are sensitive to different ranges of colour
–The
human
eye is not
very sensitive to red light, but quite sensitive to blue.
–A
CCD is not very sensitive to blue light, but is very sensitive to red.
–An
unfiltered
CCD takes
in a range of wavelengths of light much greater than the human eye.
–OJ287
has a colour quite similar to that of the Sun, with more red than blue light.
–So
it is normal to expect different results with each kind of measure.
