Jump to content




Welcome to Unexplained Mysteries! Please sign in or create an account to start posting and to access a host of extra features.


- - - - -

Mount Graham


  • Please log in to reply
4 replies to this topic

#1    Sakari

Sakari

    Rob Lester

  • Member
  • 13,272 posts
  • Joined:16 Aug 2009
  • Gender:Male
  • Location:Safford, Arizona...My heart and soul are still on the Oregon Coast.

  • Do not argue with an idiot. He will drag you down to his level and beat you with experience.

Posted 24 March 2014 - 04:58 AM

It is now 9:45 PM, there are some low clouds, more of a haze really. ( only reason we can see this ) I live in Safford, Arizona. Mount Graham can be seen from our back yard, we are almost at the foothills.

Just thought I would post because it is a sight to see. A large green lazer going up as far as we can see. I understand it is used in the new binocular scope up there to help get rid of " twinkles " of stars. To reduce light.

Wish I new more about it, and wish I could get a picture, but not sure how to get my cameras flash to turn off.

Anyway, might be a dumb post, but I thought it was cool to see.

Edited by Sakari, 24 March 2014 - 04:58 AM.

Our Wolf's Memorial Page

http://petsupports.com/a04/sakari.htm


#2    Waspie_Dwarf

Waspie_Dwarf

    Space Cadet

  • 33,080 posts
  • Joined:03 Mar 2006
  • Gender:Male
  • Location:Bexleyheath, Kent, UK

  • We are all in the gutter, but some of us are looking at the stars.

    Oscar Wilde

Posted 24 March 2014 - 05:19 AM

View PostSakari, on 24 March 2014 - 04:58 AM, said:

Just thought I would post because it is a sight to see. A large green lazer going up as far as we can see. I understand it is used in the new binocular scope up there to help get rid of " twinkles " of stars. To reduce light.
You are correct about the twinkles but I have not sure what you mean by "to reduce light". The entire point of a telescope is to collect as much light as possible.

The Large Binocular Telescope (LBT) on Mount Graham uses adaptive optics. The secondary mirrors can be deformed under computer control. The laser is used as a "control" source of light. Star "twinkling" (astronomers call it scintillation) is caused by movement of the air. By observing the way that the atmosphere affects the laser computers can rapidly distort the secondary mirrors to counteract the atmospheric distortion.

The end result is that, at some wavelengths, the LBT has a better resolution than the Hubble Space Telescope.

Footnote
I don't usually correct spellings but I will make an exception in this case, as it is a point of science not a point of grammar. I know Americans like to use a "z" in words where we Brits use an "s", which is obviously fine,  but in "laser" it is totally incorrect as laser is an acronym, not a word. It stands for Light Amplification by the Stimulated Emission of Radiation.

"Space is big. Really big. You just won't believe how vastly, hugely, mind-boggingly big it is. I mean, you may think it's a long way down the street to the chemist, but that's just peanuts to space." - The Hitch-Hikers Guide to the Galaxy - Douglas Adams 1952 - 2001

Posted Image
Click on button

#3    Sakari

Sakari

    Rob Lester

  • Member
  • 13,272 posts
  • Joined:16 Aug 2009
  • Gender:Male
  • Location:Safford, Arizona...My heart and soul are still on the Oregon Coast.

  • Do not argue with an idiot. He will drag you down to his level and beat you with experience.

Posted 24 March 2014 - 05:28 AM

View PostWaspie_Dwarf, on 24 March 2014 - 05:19 AM, said:

You are correct about the twinkles but I have not sure what you mean by "to reduce light". The entire point of a telescope is to collect as much light as possible.

The Large Binocular Telescope (LBT) on Mount Graham uses adaptive optics. The secondary mirrors can be deformed under computer control. The laser is used as a "control" source of light. Star "twinkling" (astronomers call it scintillation) is caused by movement of the air. By observing the way that the atmosphere affects the laser computers can rapidly distort the secondary mirrors to counteract the atmospheric distortion.

The end result is that, at some wavelengths, the LBT has a better resolution than the Hubble Space Telescope.

Footnote
I don't usually correct spellings but I will make an exception in this case, as it is a point of science not a point of grammar. I know Americans like to use a "z" in words where we Brits use an "s", which is obviously fine,  but in "laser" it is totally incorrect as laser is an acronym, not a word. It stands for Light Amplification by the Stimulated Emission of Radiation.


Thanks for that. I just did a quick google and may have read the twinkle part wrong. Can still see it, pretty bad ass.

P.S. I will never spell laser wrong again.  :)


Found a picture, but it is a close up, not what we are seeing.

Posted Image

Edited by Sakari, 24 March 2014 - 05:32 AM.

Our Wolf's Memorial Page

http://petsupports.com/a04/sakari.htm


#4    ChrLzs

ChrLzs

    Just a contributor..

  • Member
  • 4,042 posts
  • Joined:21 Nov 2009
  • Gender:Male
  • Location:Gold Coast (Qld, Australia)

  • I only floccinaucinihilipilificate
    when it IS worthless...

Posted 24 March 2014 - 11:09 AM

What's your camera?  Maybe you can't turn the flash off, but usually there's a little button with a pic of lightning on it..  or it might be hidden in a menu, or more likely you might just have to change the 'scene mode'...

(If all else fails, stick a bit of black electrical tape over it - it probably won't catch fire... :whistle: )

My garden is already magical and beyond beautiful - I do not need to invent fairies... - ChrLzs

The truth ONLY hurts when it slaps you in the face after you haven't done proper homework and made silly claims... - ChrLzs

#5    Sakari

Sakari

    Rob Lester

  • Member
  • 13,272 posts
  • Joined:16 Aug 2009
  • Gender:Male
  • Location:Safford, Arizona...My heart and soul are still on the Oregon Coast.

  • Do not argue with an idiot. He will drag you down to his level and beat you with experience.

Posted 24 March 2014 - 04:53 PM

View PostChrLzs, on 24 March 2014 - 11:09 AM, said:

What's your camera?  Maybe you can't turn the flash off, but usually there's a little button with a pic of lightning on it..  or it might be hidden in a menu, or more likely you might just have to change the 'scene mode'...

(If all else fails, stick a bit of black electrical tape over it - it probably won't catch fire... :whistle: )


It can be turned off. Just did not want to read instructions last night. I will see it again :)

Our Wolf's Memorial Page

http://petsupports.com/a04/sakari.htm





0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users