| Neptune spectroscopy and photometry 2019/09/19 by Christophe.P |
Here is my third and last spectroscopy run on Neptune for the current season. I have improved a bit the technic and these results should be the more precise ones, so I add a color spectrum for illustration. In particular, I have modified the values of the Sun magnitudes used to calculate the photometric albedos, since I got aware that the different values found in the scientific litterature are enough to make the final results vary from up to 2 or 3 points, which is noticeable. For B and V I have used the values taken in Richard Schmude's book (-26,10 and -26,75), because they take the results closer to those of Karkoschka (who used again different magnitudes), and to keep on his track. For R and I, I stick to those exposed in Villmer for the Bessel/Cousin filters (-27,15 and -27,47) since in Richard's book the values are for the original Johnson Rj and Ij which are slightly different bands. So I now precise the magnitudes as Rc and Ic to avoid any confusion.
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