Ah yes, I got it to work!

First the bad news bill.

Seem's I got a glitch somewhere, with my copy of guide. I have the latest updates from the project
pluto site, as far as I can tell.

I did what you said to do, but I got no result with epoxi.

Now the good news.

I deleted the probes file, located in guide and the planets directory. The probes still showed up,
minus epoxi. So that seems to tell me, that file isn't being used by guide, as far as I can tell.

I remember something, I noticed awhile ago, so I tried it.

I placed the files from the file at

http://www.projectp luto.com/epoxi.zip

Into the planets directory of guide.

I then added the epoxi info, to the now_comt file, and epoxi appeared it guide:)

So something funny going on, with my copy of guide.

If I delete the epoxi files, from the planets directory, epoxi goes bye bye, as expected. This is
because guide is being told to look for the files there, with the line

@planets\epoxi.ele

At least I can now see, the spacecraft in guide.

Kevin





--- Bill J Gray <pluto@...> wrote:

> Hi Kevin,
>
> One problem you may have encountered is this: "probes"
> are controlled as if they were "asteroids". That is, you
> have to go to Display... Data Shown, and turn asteroids
> On. (Or to a really, really faint magnitude limit, since
> you're looking at really, really faint objects.)
>
> Obviously, they ought to be controlled as "artificial
> satellites". Something for me to fix... as I write this,
> I see a possible way of fixing it that shouldn't be too
> unpleasant to do.
>
> Adding interplanetary probes requires doing essentially
> what Jari described. I'd add only the following comments:
>
> "...The other probes have additional information but
> Guide does't seem to mind the truncated version." The
> added data provides a magnitude and (optionally) the
> ability to specify the time range of the elements. That
> allows you to do things such as prevent the probe from
> being "seen" before it was actually launched, or to keep
> it from showing up after it hits a planet or comet or
> some other solid object. Also, you can specify that the
> elements are actually referenced relative to some other
> object. (For example, there are some heliocentric
> elements for Cassini prior to its arrival at Saturn.
> Then it switches over to "Center: 6", i.e., Saturn-
> centered elements.)
>
> To get EPOXI/Deep Impact to appear over its entire life
> span, from launch on 12 December 2005 to its arrival at
> P/Hartley in 2010, you may want to download the following:
>
> http://www.projectpluto.com/epoxi.zip
>
> and unZIP it in your Guide folder. Then take the eight
> lines from 'epoxi.txt' and append them to 'probes.dat'.
> Add eight to the number at the top of 'probes.dat'.
>
> This provides one long set of heliocentric ephemerides,
> plus some geocentric ephemerides near launch and at the
> times of the three Earth encounters. That's why eight
> lines are required: there are seven time intervals
> (launch, launch-to-first-encounter, first Earth
> encounter, first-to-second-encounter, second Earth
> encounter, second-to-third encounter, third Earth
> encounter, and the entire period after that final
> Earth encounter until it reaches P/Hartley.)
>
> Getting the Horizons e-mail system to generate what
> you want usually takes a bit of trial and error. But
> it'll usually work, eventually!
>
> -- Bill
>

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