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you mean, sedna? (thats the planets name )
i think through a telescope, and because it was following the pattern of an orbiting planet around our sun, but the orbit length is so huge that it takes so long that we didnt have the technology last time, like 500 years ago or something to tell that it was a planet, ive heard that it might not be just our sun that it orbits because the path is so huge it is likely that there is another sun at the other end to swing it back round either in one big oval or in a figure of eight we dont know.
Apart from the 8 planets, there are three currently recognised "dwarf planets". These are Eris, Pluto and Ceres.
Sedna will qualify as a dwarf planet if it proves to be in hydrostatic equilibrium, as is currently suspected.
There are as many as 50 other objects in the Kuiper belt and asteroid belt that are being examined for inclusion as dwarf planets, this is an area which is currently undergoing an overhaul of classification, with a lot of work to be done.
We don't know of any object that would qualify as a tenth... or even a ninth planet.
We had never discovered nine, not by today's criteria of what a planet is.
That's like saying
You: "oh i have ten cookies"
Me: "actually that tenth one is some dried up mud"
You: "oh, well i HAD ten cookies"
or
You: "oh i have ten cookies"
Me: "actually a cookie is defined by the localised clusters of high densities of chocolate, your tenth cookie is in fact just a biscuit" (excuse the british and slightly arbitrary differentiation between cookie and biscuit, i'm just trying to illustrate the point)
You: "oh, well i HAD ten cookies"
neither pluto, nor sedna, is a planet. please stop confusing the OP
i thought sedna was a planet?,
i know that pluto 'technically' isnt a planet anymore, because they changed the deffinition of what a planet is.
and speaking of the OP i see that you have not posted an answer to his question, 'technically'
A planet, as defined by the International Astronomical Union (IAU), is a celestial body orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, not massive enough to cause thermonuclear fusion in its inner core, and has cleared its neighbouring region of planetesimals.
Pluto is not a planet, it's a dwarf planet. Nothing to do with "technically". It's not a planet.
Sedna is a potential dwarf planet, dependant on us gathering more information about whether it's in hydrostatic equilibrium (one of the criteria for being a dwarf planet).
In either case, Sedna will never be a planet under the current definition. The grandest title you could give to Sedna at the moment is "asteroid". It's refered to as a "trans-Neptunian object".
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