Eos Chasma (Mars)
Data as of 2026-10-23
What it is
- Type
- Chasma, chasmata
- IAU definition
A deep, elongated, steep-sided depression
- Diameter
- 1,305.7 km, 39 % of the radius of its body
- Centre
- 12.15° S, 320.83° east (planetocentric latitude, east longitude from 0 to 360°, the IAU convention)
- Name adopted
- 1973
- Origin of the name
Classical albedo feature name.
Quoted in English, as the IAU publishes it.
In Galaxy
Opens its body in the application, the camera turned towards Eos Chasma.
Observed by
Instruments whose footprint touches this formation, counted by the PDS Orbital Data Explorer (data frozen on September 29, 2026). A footprint that touches it is not a study of it.
| Mission and instrument | Products | First | Last |
|---|---|---|---|
| Mars Global Surveyor · Mars Orbiter Laser Altimeter | 658 | September 15, 1997 | June 30, 2001 |
| Mars Global Surveyor · Mars Orbiter Camera | 11,222 | September 21, 1997 | October 17, 2006 |
| 2001 Mars Odyssey Orbiter · Thermal Emission Imaging System | 37,975 | February 22, 2002 | November 29, 2025 |
| ESA's Mars Express · Observatoire Mineralogie, Eau, Glaces, Activite | 1,488 | January 14, 2004 | December 31, 2023 |
| ESA's Mars Express · High Resolution Stereo Camera | 1,141 | January 14, 2004 | February 23, 2026 |
| ESA's Mars Express · Planetary Fourier Spectrometer | 2,100 | January 29, 2004 | December 16, 2018 |
| ESA's Mars Express · Mars Advanced Radar for Subsurface and Ionsphere Sounding | 3,589 | July 21, 2005 | April 3, 2022 |
| Mars Reconnaissance Orbiter · Context Camera | 1,858 | March 24, 2006 | May 31, 2026 |
| Mars Reconnaissance Orbiter · Compact Reconnaissance Imaging Spectrometer for Mars | 29,755 | September 30, 2006 | May 4, 2022 |
| Mars Reconnaissance Orbiter · High-Resolution Imaging Science Experiment | 2,586 | September 30, 2006 | July 27, 2026 |
| Mars Reconnaissance Orbiter · Shallow Radar | 3,622 | March 30, 2007 | December 16, 2025 |
| ExoMars Trace Gas Orbiter · Colour and Stereo Surface Imaging System | 3,012 | April 30, 2018 | December 20, 2024 |
| Viking Orbiter 1 and 2 · Visual Imaging Subsystem Camera A/B | 1,090 | no date published | no date published |
Sources
International Astronomical Union Working Group for Planetary System Nomenclature, Gazetteer of Planetary Nomenclature, read on October 23, 2026. Feature page: https://planetarynames.wr.usgs.gov/Feature/1810
Type definitions: IAU Descriptor Terms, read on October 17, 2026. https://planetarynames.wr.usgs.gov/DescriptorTerms