Re: ISS LIDAR System

From: Gregg Hendry <gregg.hendry_at_gmail.com>
Date: Sat, 8 Feb 2014 15:56:58 -0700
According to the referenced web site:

 "While CALIPSO can deliver 20 pulses of laser per second, using, as
McGilldescribed it, a whopping 110
milliJoules of energy in each of those pulses, CATS will fire 5,000 laser
pulses per second, with only about 1 milliJoule for each pulse."

With less than 1 percent of CALIPSO's laser power CATS would be quite
difficult to see.  One would have to be within 100 meters or less of the
laser's ground track to see anything but a brief green twinkle.  I am
guessing that under ideal conditions an observer exactly on the ground
track could see a short green streak maybe 1 degree wide and 5 to 10
degrees long.

On the plus side though, the ISS comes around occasionally at a reasonably
civilized hour.  CALIPSO only appears in shadow around 2:30 AM

Gregg Hendry


On Wed, Feb 5, 2014 at 5:27 AM, DAVID DICKINSON <ghedi_dave_at_yahoo.com>wrote:

> Interesting; a LIDAR system similar to the one used by CALIPSO is headed
> to the ISS later this year;
>
>
> http://www.nasa.gov/mission_pages/station/research/news/cats_in_space/#.UvItiPldWb7
>
>
> I wonder if it'll be visible on shadow passes of the station?
>
> Thanks,
>
> Dave Dickinson
> Blog: www.astroguyz.com
> Twitter: http://twitter.com/Astroguyz
> Youtube: http://www.youtube.com/astroguyz
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Received on Sat Feb 08 2014 - 22:58:18 UTC

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