CLASSE tagged posts

Scientists Identify a Possible Source for Charon’s Red Cap

Three white rocks with green and red spots.
The Gaia DR3 astrometry is so accurate that the angular offset between the asteroid’s center of mass and the center of the area illuminated by the Sun and visible to Gaia must be accounted for. See for more details below. (Image: Reference and image credit: Tanga, P., Muinonen, K., Penttilä, A., et al., 2022, Astronomy & Astrophysics, in press.)

Southwest Research Institute scientists combined data from NASA’s New Horizons mission with novel laboratory experiments and exospheric modeling to reveal the likely composition of the red cap on Pluto’s moon Charon and how it may have formed. This first-ever description of Charon’s dynamic methane atmosphere using new experimental data provides a fascinating glimpse into the origins of this moon’s red spot as described in two recent papers.

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