"The images MAVEN captured truly are incredible," said Shannon Curry, MAVEN's principal investigator and research scientist at the Laboratory for Atmospheric and Space Physics (LASP) at the University of Colorado Boulder. "The detections we are seeing are significant, and we have only scraped the surface of our analysis."
The IUVS data also offers an estimated upper limit of the comet's ratio of deuterium (a heavy isotope of hydrogen) to regular hydrogen, a tracer of the comet's origin and evolution. When the comet was at its closest to Mars, the team used more sensitive channels of IUVS to map different atoms and molecules in the comet's coma, such as hydrogen and hydroxyl. Further study of the comet's chemical makeup could reveal more about its origins and evolution.
"There was a lot of adrenaline when we saw what we'd captured," said MAVEN's deputy principal investigator, Justin Deighan, a LASP scientist and the lead on the mission's comet 3I/ATLAS observations. "Every measurement we make of this comet helps to open up a new understanding of interstellar objects."
Far below the orbiters, on the Martian surface, NASA's Perseverance rover also caught sight of 3I/ATLAS. On October 4th, the comet appeared as a faint smudge to the rover's Mastcam-Z camera. The exposure had to be exceptionally long to detect such a faint object. Unlike telescopes that track objects as they move, Mastcam-Z is fixed in place during long exposures. This technique produces star trails that appear as streaks in the sky, though the comet itself is barely perceptible.
A division of Caltech in Pasadena, California, JPL manages MRO for NASA's Science Mission Directorate in Washington as part of NASA's Mars Exploration Program portfolio. The University of Arizona in Tucson operates MRO's HiRISE, which was built by BAE Systems in Boulder, Colorado. Lockheed Martin Space in Denver built MRO and supports its operations.
The MAVEN mission, also part of NASA's Mars Exploration Program portfolio, is led by the Laboratory for Atmospheric and Space Physics at the University of Colorado Boulder. It's managed by NASA's Goddard Space Flight Center in Greenbelt, Maryland. MAVEN was built and operated by Lockheed Martin Space in Littleton, Colorado, with navigation and network support from JPL.
JPL built and manages operations of the Perseverance rover on behalf of the agency's Science Mission Directorate as part of NASA's Mars Exploration Program portfolio.
To learn more about NASA's observations of comet 3I/ATLAS, visit: https://go.nasa.gov/3I-ATLAS