1. By: Polina Teneva ; Anna Schroeder
Neptune
By: Polina Teneva ; Anna Schroeder

2. Profile about Neptune Neptune Position: 8 Kind: Gas-planet
Distance to the sun:
4495 billion km
Temperature:
-201 Celsius
Diameter:
49105 km
Time needed to circle the sun:
about 165
1 day on Neptune:
15 h 58 min

3. Facts
Neptune is a little bit smaller than Uranus but in comparison to the Earth it huge
For one circle around the sun Neptune needs like 165 earth-years
Most of the time Neptune is at the same Constellation for year < for example: it was in 2011 at the same position in the sky like in the year 1846
It consists (like the other gas-planets) of Hydrogen, Helium and Metal
Today, Neptune is the furthest planet from the sun, 75 years ago it was Pluto but even Pluto was in some seasons closer to the sun

4. Mission: Voyager2 flew to Neptune
The Spacecraft started at the 20th August, 1977
It visited the big planets Jupiter, Saturn, Uranus and Neptune
In the 70ties all four planets were in the same area, so you can reach them with one mission
To travel the whole way to Neptune, Jupiter and Saturne had a “swing-by” manoeuvre
Without that, the mission would had taken as twice as long

5. Grand Tour the Mission was called “Grand Tour”
In the beginning of the Mission Voyager2 had to cross the Asteroidzone
In the summer 1989 Voyager2 arrived as the first spacecraft to Neptune
The Spacecraft discovered 6 new moons when it crossed the biggest moon, of Neptune, called “Triton”

6. Mission Timetable Start: 20th August, 1977
Flight through Jupiter, 1979
Flight through Saturn, 1981
Flight through Uranus, 1986
Flight through Neptune, 1989
At the moment on the way to the end of the solar system
Signal till 2020

7. Neptune’s moons and their dicoverers
Neptune has 14 known moons, which are named for minor water deities in Greek mythology. By far the largest of them is Triton, discovered by William Lassell on October 10, 1846, just 17 days after the discovery of Neptune itself; over a century passed before the discovery of the second natural satellite, Nereid, discovered by Gerard Kuiper. William Lassell, was an English merchant and astronomer. He is remembered for his improvements to the reflecting telescope and his ensuing discoveries of four planrtary satellites.

8. Neptune’s moons and their discoverers
Gerard Peter Kuiper was a Dutch-American astronomer, planetary scientist, selenographer, author and professor. He is the eponymous namesake of the Kuiper belt. Kuiper is considered by many to be the father of modern planetary science.

9. Triton
Triton is the only large moon in the Solar System that has a retrograde orbit (an orbit that is in the opposite direction to its planet’s rotation) Radius: 841 miles (1,353 km) Surface area: 8,89 million sq miles (23,02 million km2) Orbital period: 5,56 feet/s (0,78 m/s2)