From: alain245@videotron.ca   
      
   On Dec/12/2021 at 05:10, Snidely wrote :   
   > Snidely  scribbled something on Sunday the 12/12/2021:   
   >> Alain Fournier explained on 12/11/2021 :   
   >>> You probably heard about the "Hut on the Moon" that China's Yutu 2   
   >>> rover has spotted. I don't think the hut itself is interesting but   
   >>> what I don't understand is why the image provided by China is so blurry.   
   >>> earthsky.org/space/mystery-hut-yutu-2-rover-far-side-of-moon-china/   
   >>> The hut is supposed to be about 80 m away. At that distance a hut   
   >>> should be easy to see. Maybe the thing is very small and the image in   
   >>> the press releases is a blow up of a small portion of the actual   
   >>> image. But then calling it a hut would be a strange name for it. If   
   >>> it is really very small, calling it a die would make more sense.   
   >>>   
   >>> Then there is also the fact that they say that it will take 2-3 lunar   
   >>> days (months) for the rover to get there. That would be an average   
   >>> speed of about 5 cm per hour. I know rovers can be slow, but that is   
   >>> a little ridiculous.   
   >>>   
   >>> So does anyone know at which speed Yutu 2 can roll and what   
   >>> resolution its cameras have? Does anyone know that there has been   
   >>> some kind of error in those news releases?   
   >>   
   >> I don't have the Yutu 2 specs, but consider that on November 08, 2020,   
   >> from Sol 2933 to Sol 2936, Curiosity had driven a straight line   
   >> distance of about 123.14 feet (37.53 meters), bringing the rover's   
   >> total odometry for the mission to 14.47 miles (23.29 kilometers).   
   >   
   > And more recently:   
   > "On Sept. 12, 2021 (Sol 200) Perseverance drove 175.15m in a single sol   
   > setting up for the entry into Séítah after going as far as time   
   > available for driving would allow. After an 8m segment to build the   
   > initial terrain map, the remainder 167m of the drive used AutoNav – the   
   > farthest any of our Mars rovers have driven autonomously in a single sol. "   
      
   So 175m in a sol is about 150 times faster than 80m in 2-3 months. Since   
   Yutu 2 doesn't really need auto-pilot capabilities and can be remotely   
   controlled from earth, I really don't see why it should be so slow.   
      
   Of course, the hut might very well be a very low priority objective.   
   Maybe they can roll 80m in 10 minutes, but they are going to do science   
   on the way and take a few detours to check a few other things before   
   going to the hut.   
      
      
   Alain Fournier   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)