Juno Perijove 58, February 3, 2024 |
Juno Perijove 58, February 3, 2024 |
Jan 4 2024, 05:21 PM
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Senior Member Group: Members Posts: 2517 Joined: 13-September 05 Member No.: 497 |
(Started a new thread to avoid cluttering up the PJ57 thread with PJ58 discussion.)
-------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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Feb 20 2024, 12:14 AM
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IMG to PNG GOD Group: Moderator Posts: 2251 Joined: 19-February 04 From: Near fire and ice Member No.: 38 |
This is an animation showing a simulation of Io's specular highlights:
https://vimeo.com/914591010 The illumination geometry is constant. The flight path is fictional. It is at uniform speed along a straight line from Juno's location in Io-centered coordinates when image PJ57_24 was obtained to Juno's location when image PJ58_26 was obtained and then back to the starting location. The map of Io used for rendering the animation is a map-projected mosaic of data from images PJ57_24 and PJ58_27. The mosaic does not contain specular reflections. The specular reflections appearing in the animation were added using a preliminary illumination model with the specular highlights based on the Phong illumination model. This gives a relatively good visual match to the specular highlights in the PJ58_26 and PJ58_27 images. Interestingly, with the current combination of illumination model parameters it was necessary to assume that Mazda is different from the other sources of specular highlights (e.g. Loki), i.e. more reflective and/or shiny. Without this assumption Mazda was too dark in this simulation. It is probably possible to use a different combination of model parameters where this assumption is not necessary or to use a more sophisticated specular reflection model (the Phong specular reflection model is a very simple empirical model). Interestingly, Mazda is *not* brighter than Loki Patera in the Galileo I32 image showing specular highlights from Loki etc. |
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