Questions tagged [neptune]

Neptune is the eighth and farthest planet from the Sun in the Solar System.

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3answers
5k views

Why did Voyager 2 receive a gravitational slowdown (as opposed to a slingshot) at Neptune?

I was actually answering this question today regarding velocities of spacecraft, and it occurred to me I've never really looked at this graph in much detail before: Heliocentric velocity of Voyager 2 ...
8
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1answer
452 views

To what extent could a single Triton flyby slow down a direct Hohmann transfer to Neptune for NOI?

I can't seem to find any good sources online for this, all I get are documents on how Nice model was used to compute Neptune's gravity capture of Triton via a binary dissociation, possibly because of ...
22
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1answer
4k views

Why didn't Pioneer 11 visit Uranus/Neptune, and why didn't Voyager 1 visit Pluto?

The following image from NASA shows the flight paths of Pioneer 10, Pioneer 11, Voyager 1, and Voyager 2, as well as the positions of the outer planets. It seems to me that with a little tweaking of ...
17
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2answers
4k views

Why there is no orbiter for Uranus or Neptune?

In the 21st century, why is there is no orbiter for Uranus or Neptune or at least their moons? It would definitely tell us more about the structure and composition of these planets. I know it must ...
21
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2answers
3k views

How can Trident be so inexpensive? Will it orbit Triton or just do a (slow) flyby?

The recent NY Times article Neptune’s Moon Triton Is Destination of Proposed NASA Mission says (in part): HOUSTON — Is it time to go back to Neptune? Scientists representing NASA’s Jet ...