Enki Catena
A chain of thirteen overlapping craters on Ganymede.
Enki Catena is a crater chain on Jupiter's moon Ganymede, measuring 161.3 kilometers (100.2 miles) long. It is composed of thirteen individual craters that overlap each other, forming a line or chain. The chain is notable for its location along the boundary between the dark region Perrine Regio and the brighter grooved-terrain Sicyon Sulcus, and for its likely origin from a comet torn apart by Jupiter's gravity.
Quick Facts
- Length
- 161.3 km
- Eponym
- Enki
Facts from the source article.
Lore & Background
Enki Catena is named after Enki, the god of fresh water and wisdom in Mesopotamian mythology, who rules over the Apsu or underground water aquifers. This name follows the IAU rule that surface features on Ganymede should be named after deities, heroes, and places from Ancient Middle Eastern mythologies. The IAU approved the name in 1997.
The crater chain was probably formed by a comet that was torn into pieces by Jupiter's gravity as it passed too close to the planet. Soon after this breakup, the thirteen fragments crashed onto Ganymede in rapid succession. The lack of walls, scarps, or division between individual craters strongly indicates the impacts formed almost simultaneously. The impactors landed across the sharp boundary between bright and dark terrain, delimited by a thin trough running diagonally across the center of the chain. The ejecta deposit appears very bright on the bright terrain, forming a bright ray system formerly known as Sais Facula, but no similar ejecta is visible on the dark terrain, possibly because dark materials were mixed into the ejecta. Six fragments landed on bright terrain, seven on dark terrain.
Reader's Guide
Enki Catena is significant as a well-preserved example of a crater chain on Ganymede, likely formed by a fragmented comet. Its location straddling the boundary between Perrine Regio and Sicyon Sulcus provides insight into the moon's geological diversity. The bright ray system on the bright terrain, once called Sais Facula, highlights differences in surface composition and impact processes. The chain's formation—thirteen nearly simultaneous impacts—offers evidence of tidal disruption by Jupiter, similar to the event that created Comet Shoemaker-Levy 9's impact scars on Jupiter. Three spacecraft—Voyager 1, Galileo, and Juno—have imaged Enki Catena, with Galileo providing the first close-up view from 27,200 kilometers away. Juno imaged it from several angles during its 34th Perijove in June 2021. The chain's naming after Enki reflects the IAU's mythological naming convention for Ganymede features.
Did You Know?
- Enki Catena is 161.3 kilometers (100.2 miles) long.
- It consists of thirteen overlapping craters formed almost simultaneously.
- The chain was likely created by a comet torn apart by Jupiter's gravity.
Frequently Asked Questions
What is Enki Catena?
Enki Catena is a linear chain of thirteen overlapping impact craters on Jupiter's moon Ganymede, stretching roughly 161.3 kilometers (100.2 miles) end to end.
Where exactly is Enki Catena located on Ganymede?
The chain sits right along the transition zone between the darker, older Perrine Regio terrain and the brighter, grooved Sicyon Sulcus region.
How did Enki Catena form?
It is widely believed to have been created when a single comet was shredded by Jupiter's tidal forces, sending multiple fragments into Ganymede's surface in rapid succession to carve out the overlapping crater row.
Why is it called Enki Catena, and who approved the name?
The feature is named after Enki, the Mesopotamian deity linked to fresh water and wisdom, and the International Astronomical Union officially adopted the designation in 1997, replacing its earlier provisional label Sais Facula.
Which spacecraft have captured images of Enki Catena?
Voyager 1 first imaged the chain during its flyby, the Galileo orbiter later provided higher-resolution views, and the Juno probe has added more recent observations.
More in Moons of Jupiter, Part 3 1-24
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