Index Map for Ceres HAMO Public Images
Based on the ESA/DLR Ceres cylindrical projection map, this index shows the locations of publically-released HAMO images, all feature names, Dawn Team-identified area of interest (colored circles) and other information as needed.
This index is updated to the final non-PDS public image, HAMO-89 and is completed.
The Geomorphology of Ceres
Preliminary Geomorphology of Occator crater
This is the preliminary assessment of the geological conditions of Occator crater showing the crater rim and mass-wasting processes, the floor and volcanic flows and the hydrothermal vents and deposits. All. of course, subject to revision and rethinking.
The enigmatic spots of Occator Crater
The light-colored spots shown with varied levels of enhancement. These spots were discovered with Hubble and were originally given number-designations--- this is known as Spot 5. The spots are thought to be related to hydrothermal vents and may be visible water ice or residual salts deposited on the surface around the vents.
Mists or haze have been reported and water vapor has been detected from ground observations, so something wonderful is happening here...
HAMO Image 6
This Facula is unusual because it is located on a Highland area and not on a Lowland plain. Although it could be related to an impact disturbing a zone of light-toned material and exposing it as ejecta, it could very well be related to be an effusive process related to episodic hydrothermal activity.
HO-6 is related to Survey Orbit image SO-22 and is located NE of the crater Toharu
A Facula related to an 1.5 Km impact crater west of Fejokoo Crater
This image from HO-8 had too wide a range of intensities to process and present on a single image, so it was processed as three images over three different ranges.
Note the two bright spots on the northwest rim, which may represent boulders of the light-toned facula-producing unit.
Comparison between an early Survey Orbit image of the "Occator Spot" and the first public HAMO image of this feature
The SO image is shown with another color-coded brightness level image to delineate the subtle intensity levels of the light spots. The HAMO image is lightly processed to bring out details and presented at reduced scale. The primary difference between the two timeframes is that the two medium-sized spots to the East of the main spot are not seen in the HAMO image, although you can barely detect their former locations.
Comparison between enlarged images of the "Occator Faculae"
The upper image is PIA19889 is a HAMO image taken around 21 August 2015 and the lower image is PIA19579 and is a Survey Orbit image taken on 9 June 2015 and are presented at an image scale of 205 meters/pixel.
Although the earlier SO image is less clear, similar features can be spotted on both images and over the time span it appears that no significant changes have taken place. Note that the pair of spots on the Eastern side are less prominent in the SO image than in the HAMO image. It may well be that this pair of spots shows decreased activity in the later image, but it might be that this is simply an artifact of NASA compositing the image.
An annotated view of another peculiar slump feature from the PIA19896 HAMO-18 image.
This shows an area of mass-wasting near crater Datan with multiple lobes which suggests episodic events. In addition it shows a peculiar light-toned area in highlighted in Yellow with unusual tabular, upturned beds and a downslope terrain with a jumbled and chaotic nature highlighted in Magenta. A fracture zone to the South is highlighted in Blue.
What a strange little world.
Montage of Images between Urvara and Yalode Craters
This series of images may trend northward between craters Urvara and Yalode and into the fractured continental terrain south of Occator. The montage will be updated as new images come in. Currently the five images are HAMO-19, -20, -21, -22 and -34.
A Crateroid surrounded by Jumbled and Chaotic terrain
This feature is surrounded by a peculiar light-toned area with unusual upturned tabular bedding and in-place rock units and lineations in multiple planes. This area is northeast of Toharu crater and has been the subject of a sequence of multiple images during the HAMO phase of the mission so this area has the attention of the Dawn team.
This initial image is a 2x-enlarged enhanced image of the northern portion of HAMO-39 and is shown without the usual descriptive annotations. It is an oblique image and has been rotated and cropped to give a better perspective view.
Unnamed crater SouthWest of crater Toharu
This HAMO public image, HO-40, is noteworthy for... nothing. After the formation of the unnamed 100Km crater in the center and subsequent impact cratering scattered about this area has lain virtually undisturbed for aeons-- no hydrothermal activity, no tectonic activity and, with the exception of the mass-wasting event from the creation of a 25Km crater on the NW rim, no major slumpages. Looking closely, there are a few faint grabens (extensional faulting) which are a result of a crustal plate relaxing on top of a lower crust or upper mantle.
This spot is a prime example of an undisturbed area and contrasts very nicely with the other images in this traverse series across crater Toharu. Good work, Dawn Team.
A companion image of this crater is PIA19888, HO-12 which shows the area under different lighting and another perspective.
Crater Victa--subject of HAMO-44
Now we can see why this 28 Km crater received it's own name-- look at the wonderful detail and activity within and around this crater. Note the lineation pattern to the left of the crater as well as the orthogonal grid pattern developing to the right of the crater.
This image is presented with a 3x enlargement at a scale of 46.7 m/pixel and is cropped, enhanced and rotated with North down.
Samhain Catena
A montage of HO-42 and HO-45 showing the northern extent of the Samhain Catena, a prominent feature southwest of Occator and just off the edge of the Fractured Terrain region between Occator and Yalode.
Although off the edge of the continental fragment comprising this Fratctured Terrain, this lineation zone is significant because it presents a glimpse into the tectonic processes taking place under this continental block that has resulted in the prominent fractures in this region.
Possible Changes in Urvara Crater
This montage of four images shows a change on the surface of Urvara Crater near the central peak. The upper left image shows this area imaged on 19 August 15 in HAMO-2. The lower left image shows the same area imaged on 28 September 15 in HAMO-50. The image on the upper right shows the HAMO-50 image reprojected to alleviate some of the perspective distortion, and the image in the lower right is the same with annotation outlining the change. The suggested sunlight direction is shown with the yellow arrow.
All images were resized 300% with an image scale of 46.7M.pixel and were rotated to North down because of the perspective angle.
The surface change seen is the enlargement of a 5.8 Km section of a 400M wide rille and occurred between August and September 2015.
A peculiar set of slump features revisited
As discussed earlier with the PIA19896 HAMO-18 image the crater Datan contains an area of episodic mass-wasting features as well as an area of peculiar chaotic terrain.
The image for HAMO-57 (pia20000) centers on crater Datan and the adjacent crater Geshtin and highlights historical slumpage and flowage features as well as a continuation of the lineation system noted earlier.dawncerescalderadatangeshtinslumpmasswastingchaoschaoticepisodic
Crater Dantu and surroundings
This image is a montage of three HAMO images of the crater Dantu:
PIA20123 HAMO-61
PIA19993 HAMO-51
PIA20122 HAMO-60
The Dantu region will be a key area for study during the upcoming LAMO phase of the mission. It is a major area for hydrothermal activity as evidenced by the numerous Whirspot fumaroles. It is a major area for volcanic activity as evidenced by the presence of a large, dark mantling deposit to the southwest discovered by Hubble Space Telescope and known as Piazzi. And it is a major tectonic area as evidenced by the many lineations, cantenae and graben of the region.
Hopefully before the LAMO campaign starts we will receive more HAMO images in the key region to the south of Dantu.
Craters Juling and Kupalo
Image HAMO 79, centered on craters Juling and Kupalo. This area was also noted as Spot 3 by Hubble.prior to the Dawn mission ot
Ceres. Enlarged 2x at a scale of 70 meters/pixel.
Compare with the image of Kupalo uploaded earlier as "HAMO Image 6".
