Broadcast 2888 Hotel Mars with Dr. Marc Rayman

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Guests: John Batchelor, Dr. Marc Rayman, Dr. David Livingston.  Topics:  Dawn Mission updates for the dwarf planet Ceres.  You are invited to comment, ask questions, and discuss the Space Show program/guest(s) on the Space Show blog. Comments, questions, and any discussion must be relevant and applicable to Space Show programming. Written Transcripts of Space Show programs are not permitted without prior written consent from The Space Show (even if for personal use) & are a violation of the Space Show copyright. We do not permit the commercial use of any Space Show program or part thereof, nor do we permit Space Show programs to be edited, placed on YouTube, or other private channels & websites. Space Show programs can be quoted in news articles, papers, academic & research work but must be cited or referenced in the proper citation format. Contact Dr. Livingston for questions about our copyright and trademark policies which we do enforce.  This program is archived on The Space Show website, podcasting, and blog sites with permission from John Batchelor. Please visit the John Batchelor Show website for more information about this fine program,  Remember, your Amazon Purchases Can Help Support The Space Show/OGLF ( note that audio and transition issues are a result of copying the John Batchelor broadcast & are not within my control as they originate in the Batchelor studio.

John Batchelor and I welcomed back Dr. Marc Rayman for updates with the Dawn Mission still in orbit over Ceres.  During our 18 minute Hotel Mars double segment program, we discussed the latest on the ice and bright spots on Ceres, volcanism (cryovolcanism), brine and salt.  We also talked about how Dawn changes orbits and why, plus the use of the ion engines on board Dawn.  Salts were discussed as was liquid water from the subsurface of Ceres.  Later in the program, we talked about gravity influences from both Jupiter and Saturn and what this means for the axial tilt for Ceres (obliquity).  We discussed the tilt and its influence for shadowed craters on Ceres, something that seems to be found only on Mercury and the Moon so far.  This is a most interesting update on Ceres and the latest coming from Dawn which is planned to continue functioning in Ceres orbit at least through June 2018.

You can email Mr. Batchelor or Dr. Rayman  through me at  Marc can also be reached through his NASA JPL website.




Ceres updates

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22 Mar 2017 Dr. Marc Rayman, John Batchelor, Dr. David Livingston
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