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Everything posted by UmbralRaptor

  1. Closer than Proxima Centauri (1.3 pc)? Very unlikely for a brown dwarf and questionable for a jupiter, though there remains the possibility of medium or small planets in the oort cloud. That said, we still have some gaps in what's slightly farther out..
  2. I've occasionally poked at analytic approximations with hyperbolae and adding vectors, but have no idea how they compare with proper numeric simulations. That said... Approximately 0. To get speeds useful for interstellar travel, you need to do a close flyby of a close in binary system with neutron stars and/or blackholes. A 0.63 au flyby of a sunlike star will not meaningfully bend your trajectory. (And even if you skim A's photosphere, you're looking at <6 arcminutes of deviation from a straight line!)
  3. I assume that they don't want the embarrassment of being the next Xavier Dumusque.
  4. This is definitely a good resource, though requires some searching. For a somewhat narrower focus, I'd also suggest The Design and Engineering of Curiosity: How the Mars Rover Performs Its Job, and Taming Liquid Hydrogen (a RL10/Centaur history). For the Soviet side of things, The Difficult Road to Mars, and Don Mitchell's website.I'd like to link a bunch of David Portree's books, but and the like seem to make it really hard to do a search if I don't know the title? at least has lots of stuff, as does
  5. This is a moderately common convention in various physics texts. I think it ends up being easier to typeset than getting the arrows and hats over the vectors right?
  6. It covers a reasonable amount of topics. Perhaps more importantly it's the only textbook I've seen where the US edition is reasonably priced. >_>
  7. These can get somewhat involved, and admittedly wikipedia doesn't always have things in the best format. The (ahem) textbook answer is Fundamentals of Astrodynamics. If you're looking purely for an online resource, @Ohiobob has done good work.
  8. The instruments are for fulfilling specific missions. (Exact type of instrument falls under the cost/weight issues you bring up, but first one needs a question to answer.)
  9. Yes, we have an IRC channel (#KSPOfficial on Please don't just jump in, say "hi" (or at best ask if you can ask a question), and leave after ~45 seconds. Say something of substance, and understand that it may take a few minutes. We aren't paid tech support, and can't be watching 24/7. Also, if we answered your question, feel free to stay and talk about other KSP (or quasi-related) things?
  10. I'm going to assume that the aforementioned Hubble images of Pluto are acceptable (ie: built up from a light curve). In that case, you want a space telescope with a starshade to get something earth-like (eg: HabEx, especially as the WFIRST proposals seem mostly dead.) The earliest plausible time is probably the 2030s, but delays are possible. We'll know more once the 2020 decadal survey is finished.
  11. It's suggestive, but not conclusive of Planet 9. Still a neat object, and apparently stable for some amusing solar system configurations. The paper is on ArXiv, and remarkably readable. There's a decent amount of sky left to search.
  12. The paper is currently open access. I'd recommend checking it out, since even if you can't follow all the fancy statistics there's interesting commentary. eg:
  13. Cryogenics get you ~25-50% higher specific impulse than hypergolics, which can ease design considerations greatly. More subtly, the propellants easiest to mine/produce on the Moon would be cryogenic in nature. I would also strongly recommend against using hyperbole to power your rocket, as that tends to leave us stuck with fantasies instead of space travel. Insert other media
  14. Replying to myself because in this case bumping is worthwhile. I resorted to temporary IP blocks because, well,
  15. As in hover over the pole? It's not an orbit, but cleverly exploiting things that aren't gravity can help:
  16. Yeah, this was the second major spam attack in a week. The IP block should have expired now?
  17. UmbralRaptor


    I'm going to blame implementation of the whole EULA thing. It apparently does some cookie thing that sometimes gets blocked by ad blockers, especially on first hitting the page. Try messing with that, and if you're still getting logged out, email the support staff. (Slow response may be in part due to grad school)
  18. Apparently the popup breaks signing up for a new account (I just got an email from a user who wanted to contribute, but was stopped by that.)
  19. I'm not sure what this counts as, but probably a negative review.
  20. And now I can download successfully. Solution: wait a 12-24 hours?
  21. Currently not even getting the proper download page. Log in, select account, select download, get bounced to the main page of the website. ...try emailing support?
  22. Not sure on the details, but you should probably email support about whatever they're doing with the servers.