Category Archives: Dawn

Ceres in Color


Great look at Ceres, click the image to see a larger version.

This view of Ceres, produced by the German Aerospace Center in Berlin, combines images taken during Dawn’s first science orbit in 2015 using the framing camera’s red, green and blue spectral filters. The color was calculated using a reflectance spectrum, which is based on the way that Ceres reflects different wavelengths of light and the solar wavelengths that illuminate Ceres. — NASA


Occator Crater Viewed Again


The Dawn spacecraft is still orbiting the dwarf planet Ceres and delivering great results.  This view of Occator Crater was taken on 18 October 2016 and highlights the area around the bright salt exposures.

From NASA/Dawn:

This image from NASA’s Dawn spacecraft shows Occator Crater on Ceres, with its signature bright areas. Dawn scientists have found that the central bright spot, which harbors the brightest material on Ceres, contains a variety of salts. The brightest parts of these features are overexposed in this image, which had an exposure time intended to capture details in the surrounding terrain. Shorter exposures allow details within the brightest areas to be seen, as in PIA20653.

Dawn took this image on Oct. 18, 2016, from its second extended-mission science orbit (XMO2), at a distance of about 920 miles (1,480 kilometers) above the surface. The image resolution is about 460 feet (140 meters) per pixel.



What Would Giuseppe Think?


This is an image of Ceres taken by the Dawn spacecraft taken on 13 June 2016.

Great image! Funny think was my very first thought was what would Giuseppe think.

Giuseppe Piazzi discovered Ceres on 1801.

From his journal:
The light was a little faint, and of the colour of Jupiter, but similar to many others which generally are reckoned of the eighth magnitude. Therefore I had no doubt of its being any other than a fixed star. In the evening of the second I repeated my observations, and having found that it did not correspond either in time or in distance from the zenith with the former observation, I began to entertain some doubts of its accuracy. I conceived afterwards a great suspicion that it might be a new star. The evening of the third, my suspicion was converted into certainty, being assured it was not a fixed star. Nevertheless before I made it known, I waited till the evening of the fourth, when I had the satisfaction to see it had moved at the same rate as on the preceding days.

About Guuseppe Piazzi and the discovery of Ceres and more.


Carbonates in Occator Crater


Now know the bright material in Occator crater is a carbonate. We also know that carbonate is sodium carbonate.

Great news IMHO.
From Dawn:
The center of Ceres’ mysterious Occator Crater is the brightest area on the dwarf planet. The inset perspective view is overlaid with data concerning the composition of this feature: Red signifies a high abundance of carbonates, while gray indicates a low carbonate abundance.

Dawn’s visible and infrared mapping spectrometer (VIR) was used to examine the composition of the bright material in the center of Occator. Using VIR data, researchers found that the dominant constituent of this bright area is sodium carbonate, a kind of salt found on Earth in hydrothermal environments. Scientists determined that Occator represents the highest concentration of carbonate minerals ever seen outside Earth.

Mystery Spots on Ceres

A nice look at some of those mysterious white spots on Ceres. The area shown above is some of the brightest on the dwarf planet.

From the Dawn vantage point of just 385 km / 240 miles scientists believe the white material is some of salt.

Looking in the center of the image at the grooved or canyon-like features it appears the ‘salts’ are not inside at the bottom – click the image to see the larger version. The mountainous feature is completely covered including irregular terrain. So knowing what type of salt we are looking at will go a long ways towards solving the second part and larger part of the mystery: how the salts came to be where they are.

The resolution of the image is very good showing 35 meters / 120 feet per pixel. I am going out on a limb and say those canyon-like features are about 210 meters / 690 feet across.


Haulani Crater


Here is an enhanced-color version of Haulani Crater on the dwarf planet Ceres.  The image was made with data from the Dawn spacecraft.  The altitude was 1,470 km / 915 miles at the time and for scale Haulani crater is 34 km / 21 miles in diameter.

Enhanced color views allows scientists to gain insight into materials and how they relate to surface morphology. Rays of bluish ejected material are prominent in this image. The color blue in such views has been associated with young features on Ceres.


Tupo Crater


The Dawn spacecraft is still at Ceres and taking some great images. Interesting thing about the craters on Ceres, there are no ray structures accompanying them. There are a number of reasons this could occur, perhaps the gravitational field is such that the ejecta is blown clear of surface.

Here’s NASA’s description:
Tupo Crater, named for the Polynesian god of turmeric, is shown at upper left in this view of Ceres from NASA’s Dawn spacecraft. This impact feature is 22 miles (36 kilometers) in diameter and features a prominent central ridge of mountains.

Just below the crater, a line of narrow troughs parallels the rim of Tupo.

The image is centered at approximately 32 degrees south latitude, 90 degrees east longitude. Another view of Tupo is found at PIA20309.

Dawn acquired this image on Feb. 9, 2016, from its low-altitude mapping orbit, at a distance of about 240 miles (385 kilometers) from the surface. The image resolution is 120 feet (35 meters) per pixel.

image and description: NASA/JPL-Caltech/UCLA/MPS/DLR/IDA

Kupalo Crater


How about some great resolution of the  surface of Ceres from the HAMO camera on the Dawn spacecraft.

From Dawn:
This image from NASA’s Dawn spacecraft shows Kupalo Crater, one of the youngest craters on Ceres. The crater has bright material exposed on its rim and walls, which could be salts. Its flat floor likely formed from impact melt and debris.

Kupalo, which measures 16 miles (26 kilometers) across and is located at southern mid-latitudes, is named for the Slavic god of vegetation and harvest.

Kupalo was imaged earlier in Dawn’s science mission at Ceres — during Survey orbit (see PIA19624) and from the high altitude mapping orbit, or HAMO (see PIA20124).

Dawn took this image on Dec. 21 from its low-altitude mapping orbit (LAMO) at an approximate altitude of 240 miles (385 kilometers) above Ceres. The image resolution is 120 feet (35 meters) per pixel.