There is not a way to tell how many km are from the sun to Sedna. It is a long distence from the sun to Sedna.
No. Sedna orbits the sun.
no
Sedna has no moons.
sedna is located in the Oort cloud and is the farthest object from the sun that we have discovered yet.
Sedna is a dwarf planet. It is to far away to be one of plutos moons and is proved to orbit the sun
The sun is about 15,000 km big
Its speed will vary greatly as its orbit is highly eccentric. It will be slower when further out from the sun on its 11,000 year orbit. Its average speed is around 1.04 km/s.
The heliosphere starts right here (or, you might say, at the Sun). Sedna is much further out. However, the heliosphere extends far out beyond Pluto. So the outer boundary of the heliosphere can be beyond Sedna. Sedna has an orbit that is very "eccentric" (highly elliptical). It's distance from the Sun varies greatly as it orbits. So, whether Sedna is inside or outside of the heliosphere changes with time.
149.6 million km
150 million km :) :-
Mars is 227,936,640 km (141,633,263 miles) from the sun on average.
Sedna, a "dwarf planet" far beyond the orbit of Neptune, has a highly elliptical orbit with a perihelion of 76AU, or about 631 light-minutes from the Sun, and an aphelion of 975 AU, or about 8,093 light-minutes or 5.6 light-DAYS.