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 At 09:24 PM 12/4/98 -0500, you wrote: >I have a predicted -9 Iridium 41 Flare coming up in my neighborhood >Sunday evening. For the elucidation of my audience and confirmation of >my own calculations, would someone please help me with the following: > >A -9 Iridium flare is ____ times brighter than Polaris. >A -9 Iridium flare is ____ times brighter than Jupiter. > >This question is awfully elementary, but I was challenged at a recent -8 >event when I said 'this will be a thousand times brighter than the >brightest star'. I guess Vega was it at the time and I was exaggerating >a little, but how much did I lie? > >Thanks. > >Bob Jones >+37.07 >-76.52 > >