Originally posted by sonhouseI do wonder how many of these are proper moons, and how many are pseudo-moons. It does make a difference when considering the question of the origin of Pluto (or even the solar system as a whole).
http://phys.org/news/2012-07-hubble-space-telescope-moon-pluto.html
Originally posted by Shallow Blue-sorry, mispost. Anyone; how does one delete a post made by accident? I haven't worked that out yet.
I do wonder how many of these are proper moons, and how many are pseudo-moons. It does make a difference when considering the question of the origin of Pluto (or even the solar system as a whole).
Richard
Originally posted by Shallow BlueWhat do you mean by pseudo moon? If it a pile of rock a mile or two in diameter, couple of Km, it is a pretty big rock, the size of a respectable mountain. What do you mean by pseudo? Humy, I think you have to ask a mod to remove a post. Don't quote me on that however
I do wonder how many of these are proper moons, and how many are pseudo-moons. It does make a difference when considering the question of the origin of Pluto (or even the solar system as a whole).
Richard
Originally posted by Shallow BlueAs with the term "planet," I think a more rigorous definition for what constitutes a "moon" is in order. Once we get down to the size of a double-wide trailer it's not a moon.
I do wonder how many of these are proper moons, and how many are pseudo-moons. It does make a difference when considering the question of the origin of Pluto (or even the solar system as a whole).
Richard
Originally posted by SoothfastI just tested that with my post here.
Edit the post by inserting an F-bomb. The nanny-filter will delete it forthwith.
Originally posted by sonhouseNot sure but I think he means a rock or object that is mistakenly assumed to be orbiting a planet because it is seen very close to it but is in fact orbiting the sun or just passing the planet by and is not in a stable orbit around the planet.
What do you mean by pseudo moon? If it a pile of rock a mile or two in diameter, couple of Km, it is a pretty big rock, the size of a respectable mountain. What do you mean by pseudo? Humy, I think you have to ask a mod to remove a post. Don't quote me on that however
Originally posted by humyAh. I now seem to recall that in the early days I had to repeat the process two or three times before the filter simply deleted the post for good, but then there came a point when just one go would turn the trick forever after. It works for me. I've done it dozens of times. But I guess you have to piss the nanny off first.
I just tested that with my post here.
I first posted "you mean " without the F-bomb to simulate an accidental post and then tried to re-edit it just by appending the f-bomb to that and the nanny-filter deleted the re-edited version but not the original which stayed put so unfortunately that wouldn't have worked. Nice try though.
Originally posted by SoothfastThere is one already. I don't know the details, or even the official terms; I just know that the distinction is made by real astronomers who understand these matters better than I.
As with the term "planet," I think a more rigorous definition for what constitutes a "moon" is in order. Once we get down to the size of a double-wide trailer it's not a moon.
Originally posted by Shallow BlueWhere are you getting this? Astronomy sites I've gone to say (if they say anything at all) only that there is no "hard" definition. The definition you give is reasonable, but try to find the astronomy textbook that says Mars has no moons, or that Jupiter has only four moons.
There is one already. I don't know the details, or even the official terms; I just know that the distinction is made by real astronomers who understand these matters better than I.
However, AIUI a proper moon is a body orbiting anothing body which was formed from that larger body, or from the same accretion disc (as our moon is believed to be, and I th ...[text shortened]... mportant if Pluto's moons are to be used to draw conclusions about Pluto's origin.
Richard
Originally posted by SoothfastI got this idea from a (popularising but not braindead) television program on astronomy, but to be honest I can't recall which one.
Where are you getting this? Astronomy sites I've gone to say (if they say anything at all) only that there is no "hard" definition. The definition you give is reasonable, but try to find the astronomy textbook that says Mars has no moons, or that Jupiter has only four moons.