HST glints

Chris Dorreman (bram.dorreman@skynet.be)
Mon, 23 Mar 98 22:13:31 -0000 (UT-)

> I don't see how an observer is supposed to be able distinguish the (2?)
> phenomena.  Now, it happens we know, with much experience and models =
of
> the craft, that there are a couple of differences.  The very brightest =

> glints from a polished Iridium surface are a few magnitudes brighter =
than
> the brightest glints from HST (perhaps 3 or 4 mags).  Also, the differe=
nce
> between the brightest magnitude and the more normal magnitude is somewh=
at
> larger.  These are nautral consequences of a couple of aspects of the =

> construction of the craft.  HST is very large.  Presumably, the normals=
 of
> the HST solar cells are not perfectly collimated.

1. Solar cells?
   I've never seen HST (far too south from 51=B0N), but from what I know =
from
   photographs, I should say that the glints are (also) caused by the rou=
nd
   plane behind the telescope mirror. Hasn't this plane roughly the same =

   surface structure as the Iridium MMA's?

2. Just for curiosity: are HST-glints predictable?

Greetings,
Chris


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