From: dpress@edwardgruf.com   
      
   On Sat, 20 Feb 2021 14:22:02 -0500, Alain Fournier   
    wrote:   
      
   >On Feb/20/2021 at 11:14, Ed Ruf wrote :   
   >> On Wed, 17 Feb 2021 22:23:21 -0500, JF Mezei   
   >>  wrote:   
   >>   
   >>>   
   >>> So mass to Mars is no longer an issue then?   
   >>>   
   >>> Or did I totally misinterpret this ?   
   >>   
   >>   
   >> I believe the re-entry mass and landing latitude are bigger drivers.   
   >> The thin atmosphere provides only so much opportunity for controlled   
   >> deceleration.   
   >   
   >Why would the landing latitude be a problem?   
      
   Variations in the atmosphere and lack of a good model.  Both spatial   
   and temporal and uncertainties therein.   
      
   https://marsed.asu.edu/mep/atmosphere   
      
   reference from the MSL wiki page:   
   "MSL Landing Site Selection User's Guide to Engineering Constraints"   
   (PDF). June 12, 2006. Retrieved May 29, 2007.   
   http://marsoweb.nas.nasa.gov/landingsites/msl/memoranda/MSL_Eng_   
   ser_Guide_v3.pdf   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)