Science

Oct 1, 2024
by Enrico de Lazaro



Protopapa et al. detected carbon dioxide and hydrogen peroxide spectral signatures on Charon using Webb telescope observations (white), which extend the wavelength coverage of previous New Horizons flyby measurements (pink). Image credit: S. Protopapa / SwRI / NASA / ESA / CSA / STScI / JHUAPL.

Beyond Neptune, a fascinating collection of small bodies called trans-Neptunian objects (TNOs) orbit the Sun. These objects serve as time capsules, offering planetary scientists a glimpse into the early Solar System.

“Charon stands unique as the only mid-sized TNO — i.e., with a diameter between 500 and 1700 km — for which geological mapping is available, thanks to measurements returned by NASA’s New Horizons mission,” said Dr. Silvia Protopapa of Southwest Research Institute and her colleagues. “Unlike larger TNOs (e.g., Pluto, Eris, and Makemake), Charon’s surface is not obscured by hyper-volatile ices, such as methane, with the possible exception toward the poles.”

“As a result, Charon serves as an excellent candidate for retrieving valuable insights into processes such as differentiation, radiation exposure, and cratering within the Kuiper Belt.”

“Charon has been extensively studied since its discovery in 1978, but previous spectral data were limited to wavelengths below 2.5 µm, leaving gaps in our understanding of its surface composition.”

“The presence of water ice, ammonia-bearing species, and organic compounds has previously been noted, but the spectral range used was insufficient to detect other compounds.”

More:
https://www.sci.news/astronomy/webb-carbon-dioxide-hydrogen-peroxide-charons-surface-13305.html