08-30-2014, 03:10 AM | #1 |
Join Date: May 2005
Location: Oz
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[Spaceships] Solar System Travel Table
There appear to be a number of errors in the "Solar System Travel Table" on p.37 of GURPS Spaceships.
1. The orbital radius of Ceres is 2.77 AU, which ought to be rounded to 2.8 AU rather than 2.7 AU. 2. The orbital radius of Saturn is 9.6 AU, not 9.5 AU. 3. The orbital radius of Pluto is 39 AU, not 40 AU. 4. The orbital radius of Oort Cloud objects (if the Oort Cloud exists) could be anything from 2,000 AU to 50,000 AU. "About 20,000 AU" would be better than "about 10,000 AU". 5. Periodic comets are associated with the Scattered Disk with orbital radii perhaps about 100 AU, not with the Oort Cloud and orbital radii about 10,000 AU. 6. The orbital period of "Oort Cloud" objects at 10,000 AU ought to be about 1,000,000 years, not 200 years. The minimum possible orbital period for any object of which its orbit takes it to 10,000 AU would be over 350,000 years.
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08-30-2014, 08:25 AM | #2 | ||
Join Date: Jun 2006
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Re: [Spaceships] Solar System Travel Table
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08-30-2014, 03:17 PM | #3 | |
Join Date: May 2005
Location: Oz
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Re: [Spaceships] Solar System Travel Table
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Kepler's Third Law, relating orbital radius to orbital period, is not speculative. The 200-year orbital period for "Oort Cloud" is quite impossible, and wrong by a factor of 5,000.
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