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Hayabusa2 carries multiple science payloads for remote sensing, sampling, and four small rovers that will investigate the asteroid surface by hopping and then o

Hayabusa2 carries multiple science payloads for remote sensing, sampling, and four small rovers that will investigate the asteroid surface by hopping and then on top of all that it will bring back samples in 2020! All of that for less than $150 million!

maxxxxx 8y ago
How does that compare with european or US missions?
- alpha_squared 8y ago
  The most recent, somewhat comparable (though not really), would be the ESA's Rosetta mission to comet P67. That cost around $1.8 billion[0]. [0] https://en.wikipedia.org/wiki/Rosetta_(spacecraft)#Design_and_construction https://en.wikipedia.org/wiki/Rosetta_(spacecraft)#Design_an...
  - maxxxxx 8y ago
    Are they similar in complexity? If Japan can do it that cheaply then others should take a long, hard look at their own cost. It's not like Japan is a low wage country.
    - adventured 8y ago
      NASA, for example, spends immense amounts of money on trying to ensure that their projects have a high success rate. They'd rather spend $2b to get a 97% likelihood of a positive outcome, than $1b with an 80% likelihood. Time is a big deal when you're going to spend a decade on a project. NASA will have a ~$250b budget for the next decade. The people that they have access to to work on projects, are finite however. Their lifespans are finite, how much time they're willing to spend on one thing is often very restricted, and just nailing them down for a given project can be difficult. There are a lot of other things they can be doing with their time. You want to get things right the first time and not spend five years doing it all over again (and more likely, the project is simply cancelled). NASA's budget being sizable, gives them some flexibility on spending more to increase positive outcome chances. It's better to spend $10b on James Webb (if necessary), than $3b with a meaningfully higher chance of failure. If it fails at the lower budget, they still won't do it all over again, it'll just be dead. It'd be a massive loss of time and potential.
      - maxxxxx 8y ago
        The James Webb scares me. They now have put so much money and time into it that a failure would just be unimaginable. I am sure they have run the numbers but personally I am not sure if they wouldn't be better off with iterating faster and cheaper while accepting some level of risk. Maybe a failure of the James Webb would be a good motivator for a manned mission to the Lagrange point :)
      - glandium 8y ago
        > They'd rather spend $2b to get a 97% likelihood of a positive outcome, than $1b with an 80% likelihood. I don't know if you picked your numbers out of a hat, but napkin statistical analysis (if I'm not mistaken) is that two attempts with an 80% likelihood would have a 96% likelihood of at least one success. That's not quite exactly 97%, but if your numbers are not their actual assessment, it's worth wondering if their bets are the good ones. The thing that skews their monetary needs towards the expensive option with a better likelihood, as I understand it, is that they can't afford the bad PR that comes from failure. But in pure, statistical terms, they might, actually be better off betting less money on projects with less likelihood of success. They would fail more often, but overall, would spend less money for the same amount of success.
        maxxxxx 8y ago
        "as I understand it, is that they can't afford the bad PR that comes from failure." I think that's the real problem.
        ridgeguy 8y ago
        NASA tried "faster, better, cheaper". It didn't work out so well. Mars Climate Orbiter, Mars Polar Lander were two missions executed under the FBC regime. They failed, arguably due to underfunding that elevated risks. It's hard to say, because the statics are sparse. I'm personally ok with paying taxes to fund missions at the level of, say, New Horizons (~$700 million over 15 years) or Cassini (>$3B).
        glandium 8y ago
- erazor42 8y ago
  There are also some ESA part on hayabusa 2 (Mascot descender)
Rebelgecko 8y ago
Is that the actual cost? I know there were estimates from 2010 for ~146 million USD, but I kinda doubt that the mission is actually that cheap (considering the launch probably cost $80 million by itself)

maxxxxx 8y ago

How does that compare with european or US missions?

alpha_squared 8y ago
The most recent, somewhat comparable (though not really), would be the ESA's Rosetta mission to comet P67. That cost around $1.8 billion[0]. [0] https://en.wikipedia.org/wiki/Rosetta_(spacecraft)#Design_and_construction https://en.wikipedia.org/wiki/Rosetta_(spacecraft)#Design_an...
- maxxxxx 8y ago
  Are they similar in complexity? If Japan can do it that cheaply then others should take a long, hard look at their own cost. It's not like Japan is a low wage country.
  - adventured 8y ago
    NASA, for example, spends immense amounts of money on trying to ensure that their projects have a high success rate. They'd rather spend $2b to get a 97% likelihood of a positive outcome, than $1b with an 80% likelihood. Time is a big deal when you're going to spend a decade on a project. NASA will have a ~$250b budget for the next decade. The people that they have access to to work on projects, are finite however. Their lifespans are finite, how much time they're willing to spend on one thing is often very restricted, and just nailing them down for a given project can be difficult. There are a lot of other things they can be doing with their time. You want to get things right the first time and not spend five years doing it all over again (and more likely, the project is simply cancelled). NASA's budget being sizable, gives them some flexibility on spending more to increase positive outcome chances. It's better to spend $10b on James Webb (if necessary), than $3b with a meaningfully higher chance of failure. If it fails at the lower budget, they still won't do it all over again, it'll just be dead. It'd be a massive loss of time and potential.
    - maxxxxx 8y ago
      The James Webb scares me. They now have put so much money and time into it that a failure would just be unimaginable. I am sure they have run the numbers but personally I am not sure if they wouldn't be better off with iterating faster and cheaper while accepting some level of risk. Maybe a failure of the James Webb would be a good motivator for a manned mission to the Lagrange point :)
    - glandium 8y ago
      > They'd rather spend $2b to get a 97% likelihood of a positive outcome, than $1b with an 80% likelihood. I don't know if you picked your numbers out of a hat, but napkin statistical analysis (if I'm not mistaken) is that two attempts with an 80% likelihood would have a 96% likelihood of at least one success. That's not quite exactly 97%, but if your numbers are not their actual assessment, it's worth wondering if their bets are the good ones. The thing that skews their monetary needs towards the expensive option with a better likelihood, as I understand it, is that they can't afford the bad PR that comes from failure. But in pure, statistical terms, they might, actually be better off betting less money on projects with less likelihood of success. They would fail more often, but overall, would spend less money for the same amount of success.
      - maxxxxx 8y ago
        "as I understand it, is that they can't afford the bad PR that comes from failure." I think that's the real problem.
      - ridgeguy 8y ago
        NASA tried "faster, better, cheaper". It didn't work out so well. Mars Climate Orbiter, Mars Polar Lander were two missions executed under the FBC regime. They failed, arguably due to underfunding that elevated risks. It's hard to say, because the statics are sparse. I'm personally ok with paying taxes to fund missions at the level of, say, New Horizons (~$700 million over 15 years) or Cassini (>$3B).
        glandium 8y ago
erazor42 8y ago
There are also some ESA part on hayabusa 2 (Mascot descender)

Rebelgecko 8y ago

Is that the actual cost? I know there were estimates from 2010 for ~146 million USD, but I kinda doubt that the mission is actually that cheap (considering the launch probably cost $80 million by itself)