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Aristarchus southern wall structure & Sirius

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#1 k.s.min

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Posted 24 February 2021 - 11:44 PM

Yeterday  night  sky  was  calm  , misty  thin  cloudy  and  seeing  great.

l  aimed  my  13"  to  the  Sirius  first  to  see  little  pup.  At  530,  600,  1500......l  couldn't  find  it.....

but  10~20  small  points  of  light(  0.2-0.5"  in  diameter)  within  10  arcsecond  from  center  Airy  disk  promised  me  that

  lf  the  firing  dancing   bunch  of  spokes  of  light  sink  down  calm  the  pup  would  be  appear.

 

Next  target  was  the  southern   wall  of  Aristarchus  crater ,  l  observed  sketched  its  structure... .

between  3-4  stepped  wall  there  was  4-5  white  motteled  regions(size ; 4-5km in  length, rather  narrow  shape  & irregular)  prominetly  differs  from  the  other  base graish structure  and  on  the  left  side(East)  wall  there  was  sudden  different  perpendicular 

waves  of  valley-like  structure.   

However  the  wall  around  inside  of  its  rim,  looks  far  very  bright  white  than  not  only  Aristachus  itself,  also  than  any  other  part  of  the  whole  lunar  surface.

Wenever  l  aim  at  this  crater  with  Shroeter  valley  l  carefully  inspect  live-hints  of  volcano,  smoke  vent,  particle  eruption,  color  change of  mantle,  etc...  not  yet  succide. 

 

Why  l  couldn't  see  the  pup  on  such  a  exellent  seeing  night?

l  have  realized   that  when  Moon  seeing  rates   9/10,  then  at  the 

just  same  moment  planet  seeing  is  5/10,  and  for  Sirius  seeing  is   3/10. 

 

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2222크기변환_20210225_125452.jpg    


Edited by k.s.min, 24 February 2021 - 11:59 PM.

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#2 frank5817

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Posted 25 February 2021 - 12:28 AM

K. S.

Nice work on the inner wall of Aristarchus. You sketch fine detail there.

 

Frank :)



#3 mdowns

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Posted 25 February 2021 - 08:04 AM

This is a really enjoyable portrait of Aristarchus KS.A fine capture in a very pleasing format.I like this a lot!


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#4 niteskystargazer

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Posted 25 February 2021 - 11:05 AM

K.S.

 

Very good sketch of Aristarchus southern wall structure & Sirius smile.gif .

 

CS,KLU,

 

thanx.gif ,

 

Tom



#5 Quinnipiac Monster

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Posted 25 February 2021 - 12:36 PM

shocked.gif



#6 k.s.min

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Posted 26 February 2021 - 10:20 AM

Thanks - ,,,,

lt  would  be  better  to  remain  the  idea  that  between  3-4  stepped  wall  there  was  4-5  white  motteled  regions(size ; 4-5km in  length,.....) .

l  think  those  are  not  serious  things  but  maybe  the  parts of   its  base   stepped  wall  lie  with  more   adequate  angle  to  reflect  sunlight  toward  me  effectively  at  that  time.   

it  was  not  very  prominently  bright  white  but  enough  white  to  distinct  surround .   

 

this  drawing(white  marking)  is  recall  of  that  night's  memory  and  l  can't  remember  that  how  long  time   those  white  mottled  regions    continue  maintain  to  shine  white....because  after  some  minutes  l  turned  my  intention  to  other  regions  to  soar  here  and  there  on  Aristarchus.

 

 

at20210227_000158.jpg


Edited by k.s.min, 26 February 2021 - 10:48 AM.

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