home bbs files messages ]

Forums before death by AOL, social media and spammers... "We can't have nice things"

   sci.space.tech      Technical and general issues related to      3,113 messages   

[   << oldest   |   < older   |   list   |   newer >   |   newest >>   ]

   Message 1,760 of 3,113   
   Henry Spencer to Parallax   
   Re: Long baseline optical interferometer   
   27 Apr 04 17:53:32   
   
   From: henry@spsystems.net   
      
   In article <792abaf9.0404260943.23de8966@posting.google.com>,   
   Parallax  wrote:   
   >Could Hubble, along with the NexGen space telescope operate as a long   
   >baseline optical interferometer in some way?   
      
   Very unlikely to be practical.  Doing optical (imaging) interferometry   
   over baselines of tens of meters is still a serious technical challenge.   
   Doing it over 1.5Mkm is just out of the question for the foreseeable   
   future.   
      
   Also note that if you want to do imaging, you need a variety of baselines,   
   not just one.  For Earth-based systems, the variety tends to be supplied   
   for free by Earth's rotation.   
      
   >Any potential advantages in using adaptive optic methods whereby a   
   >star in the far far background of both fields of view  that should be   
   >a point source is used as a reference?   
      
   None whatsoever.  Adaptive optics are very important for working through   
   Earth's constantly-shifting atmosphere, but offer no significant advantage   
   outside it.   
   --   
   MOST launched 30 June; science observations running     |   Henry Spencer   
   since Oct; first surprises seen; papers pending.        | henry@spsystems.net   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)   

[   << oldest   |   < older   |   list   |   newer >   |   newest >>   ]


(c) 1994,  bbs@darkrealms.ca