Talk:Planet X

I have a vague memory of "Planet X" also having been used to describe the theoretical ninth planet that was apparently affecting the orbit of Neptune... the search for that Planet X eventually resulted in the discovery of Pluto, though Pluto didn't end up explaining the discrepancy either. -- April

• Errr, isn't this what the article implies in its first couple of sentences? Rgamble

• • Yeah, just a terminology question. I thought it was used in the search for Pluto (Percival Lowell) with X=unknown instead of X=10. I could be wrong! -- April

• • • Ah yes, you are right. That was one of my favorite astronomical stories as a child, so I do remember it. I guess I didn't notice the apparent connection in the article made between X and 'tenth planet'. Fortunate perhaps that the designation was made X, since it fits both possibilities (X=unknown and when that one wasn't found, X=10 if they had found the hypothetical tugger of Neptune). You're right, it could be made more clear and the connection to Lowell added. Rgamble

The article says our most powerful detection techniques can detect an earth sized planet up to 70 AU away. Since we managed to detect the much smaller Sedna at 90 AU, I think these numbers may need some updating? Martijn faassen 15:49, 17 Apr 2004 (UTC)

The light received from sun decreases with the square of the distance d, and the fraction of light we're receiving from the object also decreases with the square of the distance (distances to sun and earth being approximately the same), so the intensity of the reflected light we're receiving from an object decreases with 1/d^4. The intensity is also proportional to the area of the planetary disk, so it's proportional to R^2. If we assume the same albedo for the earth-sized planet and want to know how far it has to be away to be as bright as Sedna, we find the equation R(Sedna)^2/d(Sedna)^4 = R(Earth)^2/d(unknown)^4 -> d(unknown) = d(Sedna) * sqrt(R(Earth)/R(Sedna)) = about 240 AU (for the upper limit of Sedna's size). The magnitude of Sedna is about 21, and we can detect objects down to at least magnitude 28, which is 7 mag dimmer or about 1/630 as bright as Sedna. So we can multiply the distance by 630^(1/4) which gives us about 1200 AU for an earth-sized planet! 193.171.121.30 23:38, 10 Jun 2004 (UTC)

The albedo of Sedna is estimated to be > 0.2 .... if we've a really dark planet which has an albedo of 1/50 of Sedna's then we've to multiply the distance by 1/50^(1/4) which is about 450 AU. 193.171.121.30 23:42, 10 Jun 2004 (UTC)

The following text was on the main page, which I've just removed. At first glance it looks like crackpottery. Martijn faassen 23:13, 2 Dec 2004 (UTC)

http://www.creationresearch.org/crsq/articles/21/21_3/21_3.html good web page concerning to el. magnetic fields of our planets

According to seismo researches there is Earth's core spinning more quickly than crust. Reflex to it is generation of such rotor-conductor, which is surrounded by stator-less conductive layers, coats, where are areas permanent magnetised, semiconductive, insulative-dielectric. Result-consequence so is creation of Earths electro-magnetic field. When we look at other planets, Moon, Sun and especially on their el.mag. fields, we find that Mercury, Venus, Mars, Moon have got much weeker fields than Earth (<1/100 of Earth's e.m. field intensity). Magnetic fields of Jupiter, Saturn are many times stronger and e.m. fields of Uranus, Neptune are comparable with Earth's e.m. fields intensity. Why Mercury, Mars, Moon have week e.m. fields? 1. Their cores are small, there are not big enough differences in densities of cores and sheets (in bordering lyers). Moon has not symetrical position of its core toward sheet layers. E.m. fields of outdoor planets are in opposite orientation toward Earth's field orientation, have North and south poles exchanged!!! Why?! Planet X (circa 25x mass of Jupiter, but superdensty-dwarf star, something like neutron star, or core of star rid of outer layers?!...) when everytime after aprox. 1500 years comes to perihelia thanks to it big gravity, thanks strong e. m. field shifts planets from their orbits, swing their axes and with its strong e. m. field works as primary rotor, which activate, bestir cores-rotors of planets toward their stators-sheets. It works like when we spin, roll eg on the table. First are rotating more quickly surface layers, but on the end core is (thanks to higher density) spinning more quickly and longer time too. X is comming from direction under ecliptic and crosses plane of ecliptic somewhere between Jupiter and Mars, in band of asteroids. This is reason, why magnetic fields of Jovian planets are turned toward Earth's magnetic poles. X namely works on Earth and on Jovian planets with its (X's) opposite poles. X has perihelia circa 120 millions km from Sun, above path of Venus-aprox. X travel relativly farther (comes not so close) to Venus and Mercury than to Earth on its path. Suns gravity, e. m. forces works over there more on Venus, Mercury than X, X has got (at Mercury, Venus) other angle of e. m. field than at Earth, Jupiter... these are reasons, why Venus, Mercury had got week e. m. fields and are slowly axis rotating too. Now there were observed strong changes in power, direction of Saturn's e. m. field. X is namely approaching orbit of Saturn, going to cross it within 3 years, it is result of my calculations too. Probe Huygens-Cassini will it observe+ flood, tsunami waves on Titan best regards RNDr. Smutny Pavel www.mojweb.sk/planetx www.mojweb.sk/frances

Second batch of crackpottery stuff removed from article. Martijn faassen 23:21, 2 Dec 2004 (UTC)

If you dont believe to old historical legends, historical maps writtings (Bible, senmut map, narmer palette, dendera zodiac...)so its your thing, but acceleration of motion of magnetic poles, acceleratiopn of ocean water level rising, global warming on Earth, on Mars... in last decade, evidences from ice core probes from Greenland, Antarctic-clear temperature jumps, big changes with period circa 1500years, speaks other than you... There are changes in orbits of planets, but because Planet X is member of our solar system minim. 500000 years so all planets and X and Sun are synchronised in their motions according Titus-Bode law. Super close opposition of Mars-(such close was only before 50000 years-NASA speaks so) too, transition of Venus in this summer speaks too so...were in direction from us...circa Orion const....where comes from X!!! All top astronomers in previous centuries looked for Planet X , because they have seen that paths of our planets, their deviations show existance of X. Those astronomers then forecasted position or discovered also Uranus, Neptune, Pluto!!!/!!!! Look on path of Sedna...direction Orion (there is involved ...astronomers..Brown, Trujillo...done it...opposite motion of Sun toward Planet X )...Look at many other proof (for Planet X exist.) placed on my webs.... thanks RNDr Pavel Smutny-Senmut-Resenmut...

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If a tenth planet exists, it is unlikely to be native to the solar system:
comprehensive surveys of the ecliptic have been undertaken, concluding that
no planet of Earth size or greater exists in the ecliptic plane closer than 
60 AU. Thus, any tenth planet would have to be in a highly inclined orbit,
and so likely to be a captured object and not one that was formed with the
solar system.

I disagree with the conclusion drawn here. The proper conclusion seems to be: if there is a tenth planet it is either a captured planet or it is smaller than the earth or it is farther than 60 AU from the sun.