First, a "satellite" is something that moves around a planet. A man-made object that goes to a dwarf planet would NOT be called a satellite. Perhaps a probe.
Keeping this in mind, the number of probes sent to Eris so far is zero. It has only been discovered recently, and there has not been enough time to send anything there, even assuming there were any interest in doing so.
1. Eris is quite small. 2. Eris is very far away!
With large number of low-earth-orbit satellites and the geo-synchronous orbit stuffed full of communications satellites, there aren't all THAT many "medium" altitude satellites. But there are some. The GPS navigation satellites, for example, are in highly inclined 12-hour orbits, and an unknown number of military "spy" satellites are in that middle range.
No it does not
At present there are around 24-32 satellites orbiting in medium earth orbit(11,000 miles)more the satellites more accurate navigation is produced.
Nyx
Yes, Eris, a dwarf planet in our solar system, does not have any natural satellites. It is one of the largest known dwarf planets and is located in the outer regions of the solar system beyond Neptune.
Nobody has been to Eris. The only place people have gone is to the moon, not to any of the other planets.
No natural satellites of Venus have been discovered.
There are 168 known natural satellites (moons) of the 8 major planets. There are also moons around 3 of the 5 dwarf planets (Pluto, Eris, and Haumea). There are more than 200 artificial satellites (or expired satellites) in Earth orbit or scattered throughout the solar system.
No natural satellites of Mercury have been discovered.
Yes, Eris has one known natural satellite named Dysnomia. Dysnomia was discovered in 2005 using the Keck II telescope by a team of astronomers led by Mike Brown.
there are currrently 2 known satellites oribiting mars
50
As of now, no satellites have been sent to Uranus. All the images and data we have about Uranus have been obtained from telescopes and fly-by missions.
1
As of now, there are no artificial satellites orbiting Venus. Only spacecrafts have been sent to Venus for exploration and research.
India has launched 56 satellites into space to date. Many of which have since completed their missions and are no longer operational, some have been landed.