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 05-11-2017, 05:53 AM #1 Phil Masters MIB     Join Date: Aug 2004 Location: U.K. Space Travel Times A quick question for the de facto brains trust here, because my maths and astronomy are insanely rusty; what are the minimum and maximum travel times from Earth orbit to Mars orbit, for a spacecraft capable of 0.0125G acceleration for indefinite periods? (Actually, is there a Web site that can answer this class of question? I'd have thought that someone would have created one, but Google hasn't found one for me yet.) __________________ -- Phil Masters Creator of The Small Folk - Wainscot Urban Fantasy Roleplaying. Discworld Roleplaying Game author, Transhuman Space Line Editor. My Home Page.
 05-11-2017, 06:58 AM #2 Not another shrubbery   Join Date: Aug 2004 Re: Space Travel Times Hey, Phil. Try this site, Space Travel Calculator. It's fairly easy to use (note that you don't need to fill out ALL the fields). That's just a point to point calculation, but does seem to assume acceleration to mid-point, then deceleration to the destination. 0.0125g acceleration with no limits leads to reasonable travel times within the solar system.
 05-11-2017, 07:13 AM #3 Phil Masters MIB     Join Date: Aug 2004 Location: U.K. Re: Space Travel Times Many thanks for that. Right, 15+ days... __________________ -- Phil Masters Creator of The Small Folk - Wainscot Urban Fantasy Roleplaying. Discworld Roleplaying Game author, Transhuman Space Line Editor. My Home Page.
 05-11-2017, 08:48 AM #4 Humabout     Join Date: Aug 2008 Re: Space Travel Times That low of an acceleration won't enable a Hohhman transfer, but you can take arbitrarily long to get there by just adjusting your tranfer orbit. As for the lower bound, the Pyramid article from Space Atlas entitled Halfway to Anywhere specifically addresses this concern with brachistochrone transfers. It also comes with a spreadsheet that does the calculations for you. __________________ Buy My Stuff! Free Stuff: Dungeon Action! Totem Spirits My Blog: Above the Flatline.
 05-11-2017, 10:59 AM #5 Anthony   Join Date: Feb 2005 Location: Berkeley, CA Re: Space Travel Times The flat space point to point estimate won't be quite right because your thrust is lower than planetary gravity (it's higher than stellar gravity for most of your trip so that can fairly safely be ignored), but it only makes a difference of a day or two. __________________ My GURPS site and Blog.

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