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A Nine-Planet Solar System Once More? NASA Telescope May RevealNew Planet, Tyche
On 11-02-18 06:20 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. Even with 4 Jupiter masses, the Sun still outweighs it by 250 times, so the barycenter still lies much closer to the Sun than this planet. Yousuf Khan |
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A Nine-Planet Solar System Once More? NASA Telescope May RevealNew Planet, Tyche
On 20/02/2011 4:59 PM, Dr J R Stockton wrote:
In sci.astro , Sat, 19 Feb 2011 13:43:22, Yousuf posted: Even with 4 Jupiter masses, the Sun still outweighs it by 250 times, so the barycenter still lies much closer to the Sun than this planet. Yes, but the planet is so far away from the Sun that the barycentre is still a long way from the Sun. Remember, it is mass TIMES distance that counts. 15,000 AU divided by 250 is 60 AU (I appear to have miscalculated before). Still the barycenter is the amalgamation of all of the planets as well as the Sun, not just Tyche and the Sun. Yousuf Khan |
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A Nine-Planet Solar System Once More? NASA Telescope May Reveal New Planet, Tyche
Yousuf Khan wrote:
On 20/02/2011 4:59 PM, Dr J R Stockton wrote: In sci.astro , Sat, 19 Feb 2011 13:43:22, Yousuf posted: Even with 4 Jupiter masses, the Sun still outweighs it by 250 times, so the barycenter still lies much closer to the Sun than this planet. Yes, but the planet is so far away from the Sun that the barycentre is still a long way from the Sun. Remember, it is mass TIMES distance that counts. 15,000 AU divided by 250 is 60 AU (I appear to have miscalculated before). Still the barycenter is the amalgamation of all of the planets as well as the Sun, not just Tyche and the Sun. The product of distance and mass for each tells the tail. All the usual planets operating together (Including Jupiter) never move the barycenter much beyond the Sun's radius; it's usually located within the Sun, except during times when there are "grand alignments" which the tabloids and doomsayers are so fond of. The proposed Tyche would impose another long term motion that would push the barycenter way, way out. The motion is so long term that we would hardly notice it over short time periods (like the last century or two!). |
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A Nine-Planet Solar System Once More? NASA Telescope May Reveal New Planet, Tyche
In sci.astro message , Mon, 21 Feb 2011
18:35:21, Yousuf Khan posted: On 20/02/2011 4:59 PM, Dr J R Stockton wrote: In sci.astro , Sat, 19 Feb 2011 13:43:22, Yousuf posted: Even with 4 Jupiter masses, the Sun still outweighs it by 250 times, so the barycenter still lies much closer to the Sun than this planet. Yes, but the planet is so far away from the Sun that the barycentre is still a long way from the Sun. Remember, it is mass TIMES distance that counts. 15,000 AU divided by 250 is 60 AU (I appear to have miscalculated before). Still the barycenter is the amalgamation of all of the planets as well as the Sun, not just Tyche and the Sun. Since (presumed) Tyche is so far away and orbits so slowly, the effects of the others essentially average out to a small correction while Tyche makes an orbit. -- (c) John Stockton, Surrey, UK. Turnpike v6.05 MIME. Web http://www.merlyn.demon.co.uk/ - FAQish topics, acronyms, & links. Proper = 4-line sig. separator as above, a line exactly "-- " (SonOfRFC1036) Do not Mail News to me. Before a reply, quote with "" or " " (SonOfRFC1036) |
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