It's not in Earths orbit.
Halley's orbit [See Link] is highly elliptical, and focused on the Sun. Its perihelion, its closest distance to the Sun, is just 0.6 AU (between the orbits of Mercury and Venus), while its aphelion, or farthest distance from the Sun, is 35 AU, or roughly the distance of Pluto
early 2062
Halleys comet comes back around every 76 years.
You will if you live to be 62 or 63 years old.
They come from the outer reaches of space.
That is Halley's comet, named after English astronomer Edmond Halley,
HayleysComet will come about 2061!!!!!!!!!!!! It last came in 1986.
Edmund Halley, the second Astronomer Royal, observed it and predicted it would come back 75 years later. It did come back, he was no longer alive, but it was named Halley's comet at that time.
During a comet's orbit, the coma and tails are the parts that come and go. The coma is the glowing, fuzzy cloud around the nucleus that develops as the comet gets closer to the Sun. The tails, consisting of ion and dust tails, form as a result of solar radiation and solar wind pushing the coma's particles away from the nucleus. Both the coma and tails diminish as the comet moves away from the Sun during its orbit.
Haley's comet is a comet that passes around every 76 years, it was last seen in 1986 and will next be seen in 2061. It is the only short-period comet that is visible to the naked eye. It's orbit is highly elliptical and focuses on the sun.Correctly named Halley's comet, this comet was named after Edmond Halley in 1705 and is visible to the naked eye about twice in a person's lifetime.
Edmond Halley (1656-1742), a contemporary of Isaac Newton, determined the path and orbit of the comet that bears his name. Determining the orbit of any celestial body is not easy, and depends on careful observations, measurements and calculations. More on this method can be found online or in books on astronomy. As a matter of interest--If a comet's orbit is elliptical, it will return; if it is hyperbolic, it won't ever come back; if it is parabolic it is on the cusp of returning or not, and at the very least, it has an extraordinarily long period.
It is a ball of ice. Comets have an irregular orbit. When they come near to the sun the ice melts an leave a tail of gas and liguid behind them.
I assume you are asking about C/2009 P1? This comet is no threat to Earth as it doesn't come anywhere near Earth. Its closest approach to the sun is about 1 1/2 times the size of Earth's orbit.