Re: Magnitude comparisons

Mike DiMuzio (mdimuzio@cisnet.com)
Sat, 05 Dec 1998 02:03:25 +0000

Ron Lee wrote:

> 5 magnitudes = 100 times difference in brightness so each magnitude
> is about 2.512 different than the next (2 to 3 or -4 to -5).
>
> Polaris is about magnitude 2.0 so there is a 11 magnitude difference.
>
> 11E2.512 = about 25120 times brighter than Polaris
>
> Of course that assumes i did everything right.  Actually comparing
> such a flare with anything is going to be approximate unless you
> are really good.
>
> Ron Lee
>

    No, you got it right for Polaris.  For Jupiter, right
now it is about magnitude -2.4 (quadrature on Dec 11),
so the magnitude difference is about 6.6, or a difference in
light of about 436.

    Interesting enough for Bob, the max brightness of the full Moon
is about 30 times brighter than a -9 Iridium flare.

Mike

--
41.087N  80.722W 330 meters

Mike DiMuzio    mdimuzio@cisnet.com