[FoRK] Astronomy units question

Brian Peisley brian.peisley at gmail.com
Thu Apr 14 13:30:06 PDT 2005


>From some of the graphics in the pdf file, it looks like " = 10 arc
seconds.  I don't know much regarding arc seconds, so I could be
misinterpreting that.

The "um" is definitely for micrometers (it shows correctly in the pdf file).

Brian

On 4/14/05, Joe Barrera <joe at barrera.org> wrote:
> What units are they using in this article?
> 
> http://www.spaceref.com/news/viewsr.html?pid=16144
> 
>    The radius of the disk is at least 43" (330 AU),
>    70" (543 AU), and 105" (815 AU) in extent at
>    24, 70 and 160 um, respectively.
> 
> 815 AU is 112 light-hours, according to google,
> which is to far off from 105 to make sense.
> I'm also not sure what the um is.
> 
> - Joe
> 
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