## What does "Solve" mean and what is it good for?

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• I keep seeing references to a solved image but I don t quite know what it is and what it s used for. Can someone explain? Nick
Message 1 of 10 , Jun 30, 2010
I keep seeing references to a "solved" image but I don't quite know what it is and what it's used for. Can someone explain?

Nick
• Gday Nick A Plate Solve normally refers to the process of taking a picture, then comparing measurements of the relative brightness and distances between star
Message 2 of 10 , Jul 1, 2010
Gday Nick

A "Plate Solve" normally refers to the process of taking a picture,
then comparing measurements of the relative brightness and distances between star images in the image against star catalogues, to try and find where in the sky the image was taken, and what orientation it is at.

Andrew Johansen Melbourne Australia

--- In LX200GPS@yahoogroups.com, "paizisn" <paizisn@...> wrote:
>
> I keep seeing references to a "solved" image but I don't quite know what it is and what it's used for. Can someone explain?
>
> Nick
>
• That s used in astrometry (precision measurement of star positions). Basically the stars (at least the brighter ones) in an image are matched to stars in a
Message 3 of 10 , Jul 1, 2010
That's used in astrometry (precision measurement of star positions). Basically
the stars (at least the brighter ones) in an image are "matched" to stars in a
reference catalog. From that you can tell exactly where the scope was aimed,
and the image scale and orientation. And from that, positions of anything else
in the image can also be determined to high precision (for example, asteroids).
Of course this is easiest if you already have at least an estimate for these
variables, and then "solving" just means doing the "matching" to high precision.

-John

----- Original Message ----
> From: paizisn <paizisn@...>
> To: LX200GPS@yahoogroups.com
> Sent: Wed, June 30, 2010 8:38:36 PM
> Subject: [LX200GPS] What does "Solve" mean and what is it good for?
>
> I keep seeing references to a "solved" image but I don't quite know what it is
>and what it's used for. Can someone explain?
>
> Nick
>
>
>
> ------------------------------------
>
>
>
>
>
• ... A solved image is one in which the majority of imaged stars have been matched (by software) to the actual star positions in a known (standard) star
Message 4 of 10 , Jul 1, 2010
> What does "Solve" mean and what is it good for? Posted by: "paizisn" paizisn@... paizisn Thu Jul 1, 2010 12:01 am (PDT)
>
>
>I keep seeing references to a "solved" image but I don't quite know what it is and what it's used for. Can someone explain?
>
>
>Nick

A 'solved' image is one in which the majority of imaged stars have been matched
(by software) to the actual star positions in a known (standard) star catalogue.
USNO A2.0 is a popular catalogue but there are later ones. The solving of an
image means that every object in the image has its position identified and
therefore any 'new' object in the image (such as a nova or an asteroid) also now
has its position defined. The parameters of the software can be optimised for
the equipment used.

regards

Lawrence Harris
• Andrew - Ok, that makes sense but what would this information be used for? I don t need it but it must have a purpose. Nick
Message 5 of 10 , Jul 1, 2010
Andrew -

Ok, that makes sense but what would this information be used for? I don't need it but it must have a purpose.

Nick

--- In LX200GPS@yahoogroups.com, "johansea" <johansea@...> wrote:
>
> Gday Nick
>
> A "Plate Solve" normally refers to the process of taking a picture,
> then comparing measurements of the relative brightness and distances between star images in the image against star catalogues, to try and find where in the sky the image was taken, and what orientation it is at.
>
> Andrew Johansen Melbourne Australia
>
> --- In LX200GPS@yahoogroups.com, "paizisn" <paizisn@> wrote:
> >
> > I keep seeing references to a "solved" image but I don't quite know what it is and what it's used for. Can someone explain?
> >
> > Nick
> >
>
• Nick, I m one of the people that track asteroids and feed observations to the Harvard Smithsonian Minor Planet Center. They, in turn, add the observations to
Message 6 of 10 , Jul 1, 2010
Nick,

I'm one of the people that track asteroids and feed observations to the Harvard Smithsonian Minor Planet Center. They, in turn, add the observations to a huge data base, updating the calculated orbits of said asteroids. The process of identifying the precise position of these objects is called astrometry.

Here's a posting to my club's bulletin board that describes the process a bit:
http://assne.org/board/viewtopic.php?f=53&t=2307

And here's another board posting (caution - it's a big 3MB in size).
http://assne.org/board/viewtopic.php?f=53&t=2309

The neat thing about asteroids is that if you discover one you get to name it.

Clear skies,

Pete Peterson
Wishing Star Observatory (MPC site I15)

--- In LX200GPS@yahoogroups.com, "paizisn" <paizisn@...> wrote:
>
> Andrew -
>
> Ok, that makes sense but what would this information be used for? I don't need it but it must have a purpose.
>
> Nick
• Thanks Pete, it s starting to make sense now. One more thing to add to the to do list. Nick
Message 7 of 10 , Jul 1, 2010
Thanks Pete, it's starting to make sense now.

One more thing to add to the "to do" list.

Nick

--- In LX200GPS@yahoogroups.com, "barringtonri" <pecorp@...> wrote:
>
> Nick,
>
> I'm one of the people that track asteroids and feed observations to the Harvard Smithsonian Minor Planet Center. They, in turn, add the observations to a huge data base, updating the calculated orbits of said asteroids. The process of identifying the precise position of these objects is called astrometry.
>
> Here's a posting to my club's bulletin board that describes the process a bit:
> http://assne.org/board/viewtopic.php?f=53&t=2307
>
> And here's another board posting (caution - it's a big 3MB in size).
> http://assne.org/board/viewtopic.php?f=53&t=2309
>
> The neat thing about asteroids is that if you discover one you get to name it.
>
> Clear skies,
>
> Pete Peterson
> Wishing Star Observatory (MPC site I15)
>
> --- In LX200GPS@yahoogroups.com, "paizisn" <paizisn@> wrote:
> >
> > Andrew -
> >
> > Ok, that makes sense but what would this information be used for? I don't need it but it must have a purpose.
> >
> > Nick
>
• Hi Nick, You can also use the solution to know that your telescope is pointed exactly at the target you wish to photograph. Some automation utilities will
Message 8 of 10 , Jul 2, 2010
Hi Nick,

You can also use the solution to know that your telescope is pointed
exactly at the target you wish to photograph. Some automation utilities
will slew the scope off to focus on a bright star. Then they slew back
to the target, take a picture, and solve it to make sure they got back
to the exact right place. If not, the utility can then tweak the mount
until it is pointed correctly.

Take care,
Hilary
CCD Simulator <http://www.darklights.org/simccd>

--- In LX200GPS@yahoogroups.com, "paizisn" <paizisn@...> wrote:
>
> Andrew -
>
> Ok, that makes sense but what would this information be used for? I
don't need it but it must have a purpose.
>
> Nick
>
>
> --- In LX200GPS@yahoogroups.com, "johansea" johansea@ wrote:
> >
> > Gday Nick
> >
> > A "Plate Solve" normally refers to the process of taking a picture,
> > then comparing measurements of the relative brightness and distances
between star images in the image against star catalogues, to try and
find where in the sky the image was taken, and what orientation it is
at.
> >
> > Andrew Johansen Melbourne Australia
> >
> > --- In LX200GPS@yahoogroups.com, "paizisn" <paizisn@> wrote:
> > >
> > > I keep seeing references to a "solved" image but I don't quite
know what it is and what it's used for. Can someone explain?
> > >
> > > Nick
> > >
> >
>

[Non-text portions of this message have been removed]
• If you saw my earlier reply, it s used to find exactly where the scope is aimed, along with image scale and orientation. I mentioned it could then be used to
Message 9 of 10 , Jul 2, 2010
If you saw my earlier reply, it's used to find exactly where the scope is aimed,
along with image scale and orientation. I mentioned it could then be used to
find accurate positions of any object in the image- such as asteroids.

It's also useful for automated set-ups, where goto error will mean your images
won't be aimed exactly where you want them. So after each goto to a new target,
an initial short exposure is "solved" to confirm the location, and then the aim
is tweaked if necessary.

-John

----- Original Message ----
> From: paizisn <paizisn@...>
> To: LX200GPS@yahoogroups.com
> Sent: Thu, July 1, 2010 9:34:33 AM
> Subject: [LX200GPS] Re: What does "Solve" mean and what is it good for?
>
> Andrew -
>
> Ok, that makes sense but what would this information be used for? I don't need
>it but it must have a purpose.
>
> Nick
>
>
> --- In LX200GPS@yahoogroups.com, "johansea" <johansea@...> wrote:
> >
> > Gday Nick
> >
> > A "Plate Solve" normally refers to the process of taking a picture,
> > then comparing measurements of the relative brightness and distances between
>star images in the image against star catalogues, to try and find where in the
>sky the image was taken, and what orientation it is at.
> >
> > Andrew Johansen Melbourne Australia
> >
> > --- In LX200GPS@yahoogroups.com, "paizisn" <paizisn@> wrote:
> > >
> > > I keep seeing references to a "solved" image but I don't quite know what
>it is and what it's used for. Can someone explain?
> > >
> > > Nick
> > >
> >
>
>
>
>
> ------------------------------------
>
>
>
>
>
• John, and others - Thanks for explaining this. I can see it s purpose now and I ve added it to my to do list. Nick
Message 10 of 10 , Jul 2, 2010
John, and others -

Thanks for explaining this. I can see it's purpose now and I've added it to my to do list.

Nick

--- In LX200GPS@yahoogroups.com, John Mahony <jmmahony@...> wrote:
>
> If you saw my earlier reply, it's used to find exactly where the scope is aimed,
> along with image scale and orientation. I mentioned it could then be used to
> find accurate positions of any object in the image- such as asteroids.
>
>
> It's also useful for automated set-ups, where goto error will mean your images
> won't be aimed exactly where you want them. So after each goto to a new target,
> an initial short exposure is "solved" to confirm the location, and then the aim
> is tweaked if necessary.
>
> -John
>
>
>
> ----- Original Message ----
> > From: paizisn <paizisn@...>
> > To: LX200GPS@yahoogroups.com
> > Sent: Thu, July 1, 2010 9:34:33 AM
> > Subject: [LX200GPS] Re: What does "Solve" mean and what is it good for?
> >
> > Andrew -
> >
> > Ok, that makes sense but what would this information be used for? I don't need
> >it but it must have a purpose.
> >
> > Nick
> >
> >
> > --- In LX200GPS@yahoogroups.com, "johansea" <johansea@> wrote:
> > >
> > > Gday Nick
> > >
> > > A "Plate Solve" normally refers to the process of taking a picture,
> > > then comparing measurements of the relative brightness and distances between
> >star images in the image against star catalogues, to try and find where in the
> >sky the image was taken, and what orientation it is at.
> > >
> > > Andrew Johansen Melbourne Australia
> > >
> > > --- In LX200GPS@yahoogroups.com, "paizisn" <paizisn@> wrote:
> > > >
> > > > I keep seeing references to a "solved" image but I don't quite know what
> >it is and what it's used for. Can someone explain?
> > > >
> > > > Nick
> > > >
> > >
> >
> >
> >
> >
> > ------------------------------------
> >