Uranus spectrum (UVEX)
Posted: Thu Jan 17, 2019 6:36 pm
Un spectre UVEX(3) de Uranus sur un large domaine spectral. La réflectance du disque est obtenue en divisant le spectre apparent par le spectre d'une étoile de type solaire (HD 20630) faite la même nuit et à la même distance zénithale (en gros). Un filtre d'ordre orange (OG590) est utilisé pour capturer la partie infrarouge (le spectre final est la fusion d'un spectre du visible et d'un spectre de l'IR).
A wide spectral range spectrum of Uranus planet (UVEX(3) on a RC10 telescope for a resolution power of R=1200 at 650 nm (300 lines/mm grating version) and CMOS ASI1600MM camera.
The acquisition is divided in two part : normal visible spectrum and IR spectrum (by adding an OG590 order filter). The spectra are merged in a second time. Here the comparison of Uranus spectrum vs a solar type star spectrum (HD 20630), taken the same night at nearly same elevation :
and now the division of the two (i.e. relative albedo) :
The covered spectral range is from 3670 A to 9800 A. For comparison, an albedo spectrum from Neff & all, Icarus 60, 221-235(1984) :
The UV-blue noise is probably the consequence of some difference between the observed HD20630 and the true sun spectra. Here a detail of the blue region :
Christian
A wide spectral range spectrum of Uranus planet (UVEX(3) on a RC10 telescope for a resolution power of R=1200 at 650 nm (300 lines/mm grating version) and CMOS ASI1600MM camera.
The acquisition is divided in two part : normal visible spectrum and IR spectrum (by adding an OG590 order filter). The spectra are merged in a second time. Here the comparison of Uranus spectrum vs a solar type star spectrum (HD 20630), taken the same night at nearly same elevation :
and now the division of the two (i.e. relative albedo) :
The covered spectral range is from 3670 A to 9800 A. For comparison, an albedo spectrum from Neff & all, Icarus 60, 221-235(1984) :
The UV-blue noise is probably the consequence of some difference between the observed HD20630 and the true sun spectra. Here a detail of the blue region :
Christian
