How Long Does It Take to Get to Pluto?

It’s a long way out to the dwarf planet Pluto. So, just how fast could we get there?

Pluto, the Dwarf planet, is an incomprehensibly long distance away. Seriously, it’s currently more than 5 billion kilometers away from Earth. It challenges the imagination that anyone could ever travel that kind of distance, and yet, NASA’s New Horizons has been making the journey, and it’s going to arrive there July, 2015.

You may have just heard about this news. And I promise you, when New Horizons makes its close encounter, it’s going to be everywhere. So let me give you the advanced knowledge on just how amazing this journey is, and what it would take to cross this enormous gulf in the Solar System.

Pluto travels on a highly elliptical orbit around the Sun. At its closest point, known as “perihelion”, Pluto is only 4.4 billion kilometers out. That’s nearly 30 AU, or 30 times the distance from the Earth to the Sun. Pluto last reached this point on September 5th, 1989. At its most distant point, known as “aphelion”, Pluto reaches a distance of 7.3 billion kilometers, or 49 AU. This will happen on August 23, 2113.

I know, these numbers seem incomprehensible and lose their meaning. So let me give you some context. Light itself takes 4.6 hours to travel from the Earth to Pluto. If you wanted to send a signal to Pluto, it would take 4.6 hours for your transmission to reach Pluto, and then an additional 4.6 hours for their message to return to us.

Let’s talk spacecraft. When New Horizons blasted off from Earth, it was going 58,000 km/h. Just for comparison, astronauts in orbit are merely jaunting along at 28,000 km/h. That’s its speed going away from the Earth. When you add up the speed of the Earth, New Horizons was moving away from the Sun at a blistering 160,000 km/h.

Unfortunately, the pull of gravity from the Sun slowed New Horizons down. By the time it reached Jupiter, it was only going 68,000 km/h. It was able to steal a little velocity from Jupiter and crank its speed back up to 83,000 km/h. When it finally reaches Pluto, it’ll be going about 50,000 km/h. So how long did this journey take?

Artist's conception of the New Horizons spacecraft at Pluto. Credit: Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute (JHUAPL/SwRI)
Artist’s conception of the New Horizons spacecraft at Pluto. Credit: Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute (JHUAPL/SwRI)

New Horizons launched on January 19, 2006, and it’ll reach Pluto on July 14, 2015. Do a little math and you’ll find that it has taken 9 years, 5 months and 25 days. The Voyager spacecraft did the distance between Earth and Pluto in about 12.5 years, although, neither spacecraft actually flew past Pluto. And the Pioneer spacecraft completed the journey in about 11 years.

Could you get to Pluto faster? Absolutely. With a more powerful rocket, and a lighter spacecraft payload, you could definitely shave down the flight time. But there are a couple of problems. Rockets are expensive, coincidentally bigger rockets are super expensive. The other problem is that getting to Pluto faster means that it’s harder to do any kind of science once you reach the dwarf planet.

New Horizons made the fastest journey to Pluto, but it’s also going to fly past the planet at 50,000 km/h. That’s less time to take high resolution images. And if you wanted to actually go into orbit around Pluto, you’d need more rockets to lose all that velocity. So how long does it take to get to Pluto? Roughly 9-12 years. You could probably get there faster, but then you’d get less science done, and it probably wouldn’t be worth the rush.

Are you super excited about the New Horizons flyby of Pluto? Tell us all about it in the comments below.

5 Replies to “How Long Does It Take to Get to Pluto?”

  1. Cassini/Huygens may be a good example for making long duration science…
    Next spacecraft, “unique to Pluto”, may be planned, and, may even drop a science lab on it… (I mean “non-zipping type lab”…!)

  2. Enormous distances keep the human mind in Perihelion and Aphelion: we get near then we go far. After all the science involved to achieve such feats, it’s still very scary and fear inspiring.

  3. The New Horizons spacecraft mission to Pluto is a truly stunning adventure. I only wish part of the overall mission was to orbit planet Pluto (yes, Pluto is a planet). It is my opinion, the greatly added expense to equip the spacecraft with the required decelerating retro rockets, slowing New Horizons to orbit speed would have been well worth the high investment and extra time needed to traverse the great gulf between Earth and Pluto. After all, when will we be here again?

    As Buzz Lightyear would put it: “To infinity and beyond!”

  4. I’ve been following since launch. This is super exciting and worth every second I watched tick off the counters on their webpage.

  5. Fraser, as I said in an earlier blog entry on this subject, I could not possibly be more excited about the New Horizons probe.
    Pluto (which *I* still consider to be a planet!) was discovered just three years before I was born. I was 70 in 2003 when the planning to send a probe past Pluto really got serious. I was beside myself that we might actually get some close up pictures of it within my lifetime. I just hoped I would live that long.
    Well, I hit 82 last month and here we are just four months shy of that accomplishment. I think I’ll make it and I think New Horizons will too!
    But it gets even better, because first came Charon and then Nix and Hydra and then P4 and P5! It gives new meaning to the word “wow”!
    I certainly shouldn’t complain but it is a shame that we’re “driving by” so fast.
    Is anyone taking any bets on New Horizons finding something new, something we haven’t seen before among the many planets we have visited?

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