goal: to compare neptune to its neighbor uranus objectives: 1)to learn about its atmosphere 2)to...

Goal: To compare Neptune to its neighbor Uranus Objectives: 1) To learn about its Atmosphere 2) To explore its Core 3) To learn about its Moons If time left: How the formation of the solar system affected the orbits of the gas giants.

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Goal: To compare Neptune to its neighbor Uranus

Objectives:1) To learn about its Atmosphere

2) To explore its Core3) To learn about its Moons

If time left: How the formation of the solar system affected the orbits of

the gas giants.

Page 2: Goal: To compare Neptune to its neighbor Uranus Objectives: 1)To learn about its Atmosphere 2)To explore its Core 3)To learn about its Moons If time left:

Voyager 2

Page 3: Goal: To compare Neptune to its neighbor Uranus Objectives: 1)To learn about its Atmosphere 2)To explore its Core 3)To learn about its Moons If time left:

Springtime on Neptune

Page 4: Goal: To compare Neptune to its neighbor Uranus Objectives: 1)To learn about its Atmosphere 2)To explore its Core 3)To learn about its Moons If time left:

Neptune in 3 D

Page 5: Goal: To compare Neptune to its neighbor Uranus Objectives: 1)To learn about its Atmosphere 2)To explore its Core 3)To learn about its Moons If time left:

Atmospheric make up

• Molecular hydrogen (H2) - 80.0% (3.2%)

• Helium (He) - 19.0% (3.2%)

• Methane (CH4) 1.5% (0.5%) (Uranus was 2.3%)

• Hydrogen Deuteride (HD) – 192

• Ethane (C2H6) - 1.5

• Aerosols: Ammonia ice, water ice, ammonia hydrosulfide, methane ice(?)

Page 6: Goal: To compare Neptune to its neighbor Uranus Objectives: 1)To learn about its Atmosphere 2)To explore its Core 3)To learn about its Moons If time left:

Neptune winds

• With little turbulence to dampen winds, the winds on the equator get as high as 1200 miles per hour.

• Neptune also emits twice as much energy in the infrared that the energy in the optical it gets from the sun.

• So, that means Neptune rains diamonds towards the core to generate heat!

Core

Rings

Moons

• Neptune has 13 known moons. Very few have images which are any good.

• Only one is large, Triton. Two are about 400 km in diameter. Rest are much smaller.

Page 10: Goal: To compare Neptune to its neighbor Uranus Objectives: 1)To learn about its Atmosphere 2)To explore its Core 3)To learn about its Moons If time left:

ProteusVery dark (reflects about 7% of sunlight).

120,000 km from Neptune

Outer most of Neptune’s probable original moons.

5 moons inside of Proteus’s orbit.

Nearest to Neptune is Naiad which is at 48k km from Neptune (29 km in diameter).

Page 11: Goal: To compare Neptune to its neighbor Uranus Objectives: 1)To learn about its Atmosphere 2)To explore its Core 3)To learn about its Moons If time left:

Triton

Page 12: Goal: To compare Neptune to its neighbor Uranus Objectives: 1)To learn about its Atmosphere 2)To explore its Core 3)To learn about its Moons If time left:

interesting

Page 13: Goal: To compare Neptune to its neighbor Uranus Objectives: 1)To learn about its Atmosphere 2)To explore its Core 3)To learn about its Moons If time left:

Triton up close!

• http://www.space.com/common/media/video/player.php?videoRef=SP_090902_triton

Page 14: Goal: To compare Neptune to its neighbor Uranus Objectives: 1)To learn about its Atmosphere 2)To explore its Core 3)To learn about its Moons If time left:

Triton is a captured TNO!

• TNO = Trans-Neptunian Object (an object like Pluto).

• Diameter 2700 km, which is a little smaller than our moon.

• About 10% closer to Neptune than our moon is from us.

• Its orbit is retrograde! This is a backwards orbit, which can only be if it was captured.

• However, this has some other implications…

Page 15: Goal: To compare Neptune to its neighbor Uranus Objectives: 1)To learn about its Atmosphere 2)To explore its Core 3)To learn about its Moons If time left:

Triton’s impact on Neptune

• Retrograde orbit means that tidal interactions with Neptune bring it CLOSER to Neptune!

• This means it was once further out, and probably tossed all of Neptune’s original moons which started further out that its current position away from Neptune.

• Eventually it will do the same to all the inner moons.

• Is probably the reason the outer moons have some very high eccentricities.

Page 16: Goal: To compare Neptune to its neighbor Uranus Objectives: 1)To learn about its Atmosphere 2)To explore its Core 3)To learn about its Moons If time left:

The death of Triton

• In a billion years (maybe less) Triton will get close enough to Neptune for Neptune to rip it apart.

• This will create a spectacular ring system around Neptune – even dwarfing the Saturn ring system.

• Until then, we still get to see fireworks as the volcanism on Triton caused by the Tides of Neptune continue to increase.

Page 17: Goal: To compare Neptune to its neighbor Uranus Objectives: 1)To learn about its Atmosphere 2)To explore its Core 3)To learn about its Moons If time left:

Conclusion:

• Neptune is similar to Uranus in many ways, the real difference being the moons because of the chaos the captured moon Triton has caused on the Neptune moon system.

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