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A Nine-Planet Solar System Once More? NASA Telescope May Reveal New Planet, Tyche
In sci.astro message , Fri,
18 Feb 2011 20:05:14, Sam Wormley posted: On 2/18/11 5:20 PM, Dr J R Stockton wrote: With an assumed mass of 4 Jupiters, such a planet would be very easy to detect given 19th century (or earlier) technology and sufficient patience. It will displace the barycentre of the solar system periodically by of the order of 250 AU, and Sun and Earth both orbit that barycentre. That will easily be detected by parallax measurements of many of the nearer stars, assumed to be on the average fixed. Unfortunately, the orbital period is of the order of 1.8 M years. Jupiter at a distance of ~ 5AU has a much greater effect on the Sun than would a 4 Jupiter-mass planet beyond the Kuiper belt. Your ignorance is indeed profound. The force on the Sun from Jupiter is indeed much greater than that from the supposed Tyche. But Jupiter is a flighty thing, and pulls in the opposite direction after only 6 years; it takes Tyche nearly a million years to do that. If there is a school near you with a competent physics teacher, ask for the definition, and an elementary explanation of, barycentre. The further away from the Sun an orbiting object is, the bigger its effect on the distance of the Sun from the barycentre - and the longer they take to move around it. -- (c) John Stockton, nr London, UK. Turnpike v6.05 MIME. Web http://www.merlyn.demon.co.uk/ - FAQqish topics, acronyms and links; Astro stuff via astron-1.htm, gravity0.htm ; quotings.htm, pascal.htm, etc. No Encoding. Quotes before replies. Snip well. Write clearly. Don't Mail News. |
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