Ceres High Altitude Mapping Orbit (HAMO), Late summer through fall 2015 |
Ceres High Altitude Mapping Orbit (HAMO), Late summer through fall 2015 |
Aug 17 2015, 01:42 AM
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Member Group: Members Posts: 540 Joined: 17-November 05 From: Oklahoma Member No.: 557 |
DAWN arrived in its new lower mapping orbit on August 13th. The DAWN team is preparing to resume science observation tomorrow on the 17th.
From the Current Mission Status page at the DAWN website: QUOTE August 13, 2015 - Dawn Arrives in Third Mapping Orbit
Dawn completed the maneuvering to reach its third mapping orbit and stopped ion-thrusting this afternoon. This was a little ahead of schedule because the spiral descent went so well that some of the allocated thrusting time was not needed. Since July 14, the spacecraft has reduced its orbital altitude from 2,700 miles (4,400 kilometers) to approximately 915 miles (1,470 kilometers). The orbit period has correspondingly decreased from 3.1 days to 19 hours. Dawn is scheduled to begin its new observations on the evening of Aug. 17 (PDT) and continue for more than two months. First, however, the mission control team will measure the actual orbit parameters accurately and transmit them to the spacecraft. |
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Aug 28 2015, 07:22 PM
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Member Group: Members Posts: 555 Joined: 27-September 10 Member No.: 5458 |
Whoops, wasn't sure on the name of this crater and just took a guess. Thanks for the correction.
The rays wouldn't be related to the slump necessarily. Those could be from an impact blowing them outward followed by the slumping of the side of the crater inward after a quake at a nearby fault line or just because of uneven heating of the ground. In this higher resolution image from HAMO, it looks very similar Haulani (I think previously Spot 1?) with the pattern of white material. In previous images theres a bit of evidence in my opinion, to show that Haulani is the remnant of a caldera and the white material is from sputtering magma outward. In this 'slump' or 'shelf' crater, it could be from a similar event. Possibly a single ejection event occurred and when the magma chamber emptied, it left a cavity that was partially filled by the slumped edge. -------------------- |
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