Dawn Spacecraft Unraveling Mysteries of Ceres Intriguing Bright Spots as Sublimating Salt Water Residues

This representation of Ceres' Occator Crater in false colors shows differences in the surface composition.  Occator measures about 60 miles (90 kilometers) wide.  Credits: NASA/JPL-Caltech/UCLA/MPS/DLR/IDA

With NASA’s Dawn spacecraft set to enter its final and lowest orbit around the dwarf planet Ceres, spectral measurements are enabling researchers to gradually unravel the nature of the numerous mysterious and intriguing bright spots recently discovered and now conclude that briny mixtures of ice and salts apparently reside just beneath certain patches of the pockmarked surface and that “water is sublimating” from the surface of an “active crater”.

Indeed, excited scientists report that high resolution images and spectra from Dawn indicate that Ceres is an active world even today, according to a pair of newly published scientific papers in the journal Nature.

Ceres occupies a very ”unique niche” unlike any other world in our Solar System with “occasional water leakage on to the surface,” Dawn Principal Investigator Chris Russell told Universe Today.

Orbital measurements from the probes Framing camera reveal that the bright areas likely contain hydrated magnesium sulphates, a class of mineral salts found inside the brightest spot on Ceres, namely Occator crater – which are the salt-rich leftover residues from water evaporation.

The newly released results also show evidence of a diffuse haze of water vapor above Occator crater, which appears to be among the youngest features on Ceres, as well as at a second region at Oxo crater.

The Cerean haze is formed by the warming effects of sunlight shining on the hydrated salts inside the crater. The salts were exposed by past impacts of asteroids all across Ceres. The haze could be comprised of “condensed-ice or dust particles.”

“The Occator crater on the surface of dwarf planet Ceres is active: data from NASA’s Dawn mission indicate water sublimating from its center,” say Dawn researchers in a statement.

Video caption: Ceres Rotation and Occator Crater. Dwarf planet Ceres is shown in these false-color —> Read More