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Minimum magnification for Great Red Spot

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#26 Supernova74

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Posted 31 July 2021 - 01:36 PM

Thanks for reminding me of the advantage of my location. Yes Jupiter climbs as high as near overhead here.

That kind of explains everything now! I’m moving, not into bugs tho.


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#27 treadmarks

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Posted 31 July 2021 - 05:19 PM

Last year I did try pushing low power views for a couple reasons: to see what smaller scopes would be capable of, and if the extra steadiness from the lower power is nicer than the turbulent higher power views. I was able to see the GRS down to 60X to 70X. I don't recall it being particularly difficult.


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#28 k.s.min

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Posted 02 August 2021 - 12:51 AM

Last night was a good night. Using my 78mm spotting scope with a 50x eyepiece, I detected the Great Red Spot on Jupiter. It was confirmed by switching to 75x.

 

so 50x and see the GRS. is it good? or usual?

l  usually  see  GRS  at  x100  with  my  100mm f10  achromatic  refractor,  but  l  never  tried  at  x50  or  under.

Contrary,  l  saw  GRS  at  x340  with  my  50mm  f17   achro- refractor.

Southern  Vietnam's  night  sky  seems  to  be  great  in  seeing  condition ( also  transeparency)   in  dry  season.

l  visit  there (my  wife's  mother's  house) regularly  and  whenever  stay  there  l  think  l  hope  to  build  my  own  observatory  housing  a 16"  or  bigger  telescope. 

But  for  a  foreigner  the  tropical  mosquito  is  always  hard  painful,   .....this  is  big  problem  to  me...l  need  totally  colosed  shelter  of  observatory  system  if  the  plan  start.

 

My  recent  GRS  observation  in  x600 .  South  korea

 

========================================

post-263757-0-31683300-1627077611_thumb.jpg


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#29 galazie

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Posted 02 August 2021 - 07:59 AM

l  usually  see  GRS  at  x100  with  my  100mm f10  achromatic  refractor,  but  l  never  tried  at  x50  or  under.

Contrary,  l  saw  GRS  at  x340  with  my  50mm  f17   achro- refractor.

Southern  Vietnam's  night  sky  seems  to  be  great  in  seeing  condition ( also  transeparency)   in  dry  season.

l  visit  there (my  wife's  mother's  house) regularly  and  whenever  stay  there  l  think  l  hope  to  build  my  own  observatory  housing  a 16"  or  bigger  telescope. 

But  for  a  foreigner  the  tropical  mosquito  is  always  hard  painful,   .....this  is  big  problem  to  me...l  need  totally  colosed  shelter  of  observatory  system  if  the  plan  start.

 

My  recent  GRS  observation  in  x600 .  South  korea

 

========================================

attachicon.gifpost-263757-0-31683300-1627077611_thumb.jpg

Yes, nights can be good for astronomy in southern Vietnam in the dry season, but not reliable, e.g it may be good this year and bad next year. The best place in Vietnam for starwatching is the Central Highland. I permanently station my 16inch scope there, although I live in Saigon 


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#30 galazie

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Posted 02 August 2021 - 08:12 AM

 

My  recent  GRS  observation  in  x600 .  South  korea

 

========================================

attachicon.gifpost-263757-0-31683300-1627077611_thumb.jpg

Such a terrific sketch. You have talent for drawing


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#31 payner

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Posted 02 August 2021 - 11:27 AM

Yes, nights can be good for astronomy in southern Vietnam in the dry season, but not reliable, e.g it may be good this year and bad next year. The best place in Vietnam for starwatching is the Central Highland. I permanently station my 16inch scope there, although I live in Saigon 

No disrespect, but I know of not many places short of Hawaii, Canary Islands, Atacama desert, and the like, where the observing is consistently reliable.  Here in much of the US, where summer (outside of thunderstorms) and fall were reliable, the annual western US and Canada smoke curtain is now what is reliable.


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#32 paulsky

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Posted 02 August 2021 - 11:30 AM

Galazie, you have a fantastic Nikon spotter!! 

Paul


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#33 Supernova74

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Posted 02 August 2021 - 11:53 AM

No disrespect, but I know of not many places short of Hawaii, Canary Islands, Atacama desert, and the like, where the observing is consistently reliable.  Here in much of the US, where summer (outside of thunderstorms) and fall were reliable, the annual western US and Canada smoke curtain is now what is reliable.

Well yes and no disrespect to yourself either!.there is no such thing as the climate and weather being reliable in any part of of the world it’s very difficult to predict.what once was doesn’t necessarily mean it will be now.


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#34 payner

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Posted 02 August 2021 - 05:10 PM

Yes, that's the point, isn't it? <g>



#35 galazie

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Posted 02 August 2021 - 07:03 PM

Galazie, you have a fantastic Nikon spotter!!
Paul


Thanks, Paul. It is not really bright. But very very sharp.
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#36 galazie

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Posted 15 August 2021 - 10:40 PM

Last night at my location (Saigon), using the 78mm spotting scope and 50x magnification, I observed the shadow transit of Callisto and then the double shadow transit of Ganymede and Europa. I saw both Callisto and its shadow, and both Ganymede and its shadow, on the Jupiter disk. 

 

I also observed the 10 mins when all the 4 moons disappeared (going in front of or behind the Jupiter disk).

 

Screenshots from Stellarium

Attached Thumbnails

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