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A Ray of the Ghost Companion

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#1 frank5817

frank5817

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Posted 21 February 2019 - 11:56 AM

k.s.min, on 20 Feb 2019 - 10:40 AM, said:

 

l  observed  the  Tycho  crater  on  this  night  with  my  320mm   refractor.
With  careful  attention  l  found   a  ghost  companion  crater  of  the  Tycho  ...from  where  [A]  ray  stretched  toward  the  South  pole .
Unlike  the  other   prominent  Tycho's  magnificent  long  rays(1000~3000km  length)  ,,[A]  was  not  focused  at  the  Tycho's  center......so,  l  guess   it  was  burst  out  from  other  crater.

l  could  see   the  subtle  rim  of  this  crater  which  diameter  is  about  80%  of  Tycho...l  measured  in  the  eyepieces.
The  ghost  crater  is  need  to  see  a  bit  powerful  instrument  as  its  very  low  contrast  at  this  lunation....also  its  bottom  mantle  was  seemed   buried  by  160km  diameter  dark  gray  outer  mantle  of  Tycho.

As  the  brightness with  weathering of  the  [A] ray  is  almost  same  as   the  other  Tycho's  rays,    the  formation  time  gap  must  not  be  much  different.  
  l  guess  at  first  the  ghost  crater  was  made,  then  some  10~100  thousend  years  later  the  Tycho  was  made.
Tycho is a relatively young crater, with an estimated age of 108 million years  based on analysis of samples of the crater ray recovered during the Apollo 16 mission.

 

Sketch and Lunar Observation dialogue here: https://www.cloudyni...host-companion/

Somebody  could  propose  different  opinions.
===============================================
 


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