On July 2, 2026 (Sol 1,907 of its mission), NASA’s Perseverance rover recorded something no spacecraft on a planetary surface had captured before: Earth, seen as a single point of light roughly 195 million miles away, disappearing behind the crescent silhouette of Phobos, Mars’s larger and closer moon. NASA’s Jet Propulsion Laboratory (JPL), which manages the mission, describes it as the first time an occultation of Earth by another body has been observed from the surface of another planet.
The event unfolded around 7 p.m. local Martian solar time. In the resulting composite sequence, Earth tracks from upper left to lower right across the frame while Phobos — a lumpy, potato-shaped moon only about 17 miles (27 km) across — sweeps in from lower left to upper right, its silhouette eventually sliding over the bright point that is our planet. “The composite image makes for a unique Earth self-portrait, taken from the surface of another planet, with a Phobos photobomb,” said Justin Maki, Mastcam-Z deputy principal investigator at JPL.
Because Earth was so distant and Phobos orbits Mars so close and so fast (it completes an orbit in under eight hours), the geometry needed to line up precisely for Perseverance’s cameras to catch the moment of disappearance — part of why the observation is being flagged as a first rather than a routine imaging exercise.
What captured the image: Mastcam-Z
The instrument responsible, Mastcam-Z, is a pair of zoomable, stereoscopic mast-mounted cameras on Perseverance’s mast — the rover’s primary “eyes” for both science and navigation imagery. Like most planetary instruments, Mastcam-Z is not the product of a single lab, and its formal credit line reflects that directly:
- Lead (Principal Investigator institution): Arizona State University. ASU’s Mars Space Flight Facility holds scientific leadership of the instrument — setting its observation priorities, leading data interpretation, and taking responsibility for the science the instrument is built to deliver.
- Build (instrument hardware): Malin Space Science Systems, a San Diego-based aerospace company that designs and manufactures the camera hardware itself, under contract to the science lead.
- Operate (mission operations): NASA’s Jet Propulsion Laboratory, which manages Perseverance day to day, sequences commands to the rover, and operates Mastcam-Z as part of the rover’s integrated instrument suite once it is on Mars.
This lead/build/operate split is a common structure across NASA planetary instruments and is worth naming explicitly, because it maps closely onto the contribution categories research-administration and authorship standards exist to disambiguate. A journal citation, mission credit line, or funding acknowledgment that simply says “Mastcam-Z, JPL” collapses three genuinely distinct forms of contribution — scientific leadership and conceptual design, physical construction of the instrument, and ongoing operational execution — into one institution. The CRediT taxonomy, developed for journal articles, formalizes this same distinction for individual contributors through roles like Conceptualization, Methodology, and Investigation rather than one undifferentiated “author” credit; large multi-institution instrument teams and consortia (see how large genomics consortia like UK Biobank credit hundreds of contributors) face the identical underlying problem at a bigger scale: how to make who-did-what legible when a single deliverable passes through several institutions with different roles.
Why this observation matters
Beyond its novelty, the sequence is a reminder of how routine spacecraft engineering — precise mast-camera pointing, timed image sequencing, orbital geometry prediction — can produce a genuinely new class of observation. NASA notes this is the first time an occultation of Earth has been captured from the surface of another planet, distinct from the more familiar Earth-Moon occultations or transits observed from Earth or from orbit.
Perseverance has been operating in Jezero Crater since its February 2021 landing, and Mastcam-Z remains one of its primary science and engineering imaging systems. The full image sequence and NASA’s account of the observation are available via JPL.
Source: NASA/JPL, “NASA’s Perseverance Rover Watches Earth Vanish Behind Martian Moon” (August 5, 2026).
