# RE: Satellite transit question

From: Kevin Fetter (kevin_fetter@hotmail.com)
Date: Wed Jan 08 2003 - 20:25:19 EST

• Next message: Kevin Fetter: "Re: iridium flare on moon"

```Rob Wrote

Kevin Fetter has long asked for this feature in my EARTH program, but
other projects have unfortunately occupied my free time over much of
the last year.  The aforementioned EARTH program ~does~ generate
exactly the kind of file you want (time, latitude, longitude) for
a satellite's transit centerline track, but for *solar* transits
rather than lunar ones.  If there is still interest out there (a
show of hands?) I'll bite the bullet and code it in.

Heck I even used rob EARTH program to try and find out where I could go to
see an iridium flare on the moon. So I used the rob program, with data from
stk, and got a hit. It took some work, but I knew my wacky idea sort of
works:)

Here's my wacky logic, get ready to laugh:)

I use EARTH to get the path where a certain iridium satellite is flaring. I
use stk to see where that certain iridium will transit the moon's centre. I
plot the data from earth and stk programs on a map found in the guide
astronomy program. I then look at the path's and see when the time of a
iridium flare is close to the time that satellite go across the moon. Since
the flare path is where the flare is brightest, and the line from stk where
the satellite will go across the centre of the moon, then if the two lines
cross somewhere on earth, and the time they cross is close to each other,
then you should be able to watch a flaring iridium sat go across the moon
around that area. So I did a test, after I little work, I ran skymap, and
what do you know, it show's a flaring iridium going across the moon. It was
for an event in the future so the error's add up , but still it seems to
work:)

Now if rob could write a program to find where to go to see a iridium flare
on the moon, when he has the time.

Kevin

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