PJ44 North Pole at Minimum Emission Angle

2022-08-21 10:59 UT
Credit : NASA / JPL / SwRI / MSSS / Gerald Eichstädt
Submitted By : Maquet-80
Mission Phase : PERIJOVE 44
Source Image(s) : JNCE_2022229_44C00039_V01

This image was rendered in a cylindrical projection of 60° x 180° at a resolution of 30 pixels per degree seen from a reference frame of Juno's position at the stop time of the image.

It is approximately illumination-adjusted according to a polynomial of 3rd degree over the cosines of the incidence and the emission angle;

the green channel of the PJ43 JunoCam images of TDI 1 has been used for the best fit polynomial; the polyonomial is manually modified a little bit in order to avoid an over-emphasis of the terminator region.

After illumination-adjustment, the image was gamma-stretched to the 4th power of linear radiometric values.

Since it appears that the sensitivity of the overall camera optics is radiation-degrading in a wavelength-dependend fashion, the linear radiometric weights (0.768; 1.000; 2.630) have been used for the respective (R; G; B) channels.

Those weights white-balance the PJ43, TDI 1, linearized RGB images globally. They were obtained by the best fit of a degree 0 polyonomial, which is nothing else than a respective constant for each color channel.

Some of the camera artefacts and of charged particle hits are removed.