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  Trader Rating: 0 · #31  
Old August 19th, 2006, 10:40 AM
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I'd say if it has a natural sattelite, it's a planet.

Otherwise it's just a satellite of a star.....which is technically what "planets" are.
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  Trader Rating: 1 · #32  
Old August 19th, 2006, 08:18 PM
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What do you call a natural object that obits a moon?
A moon-moon?
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Old August 19th, 2006, 08:20 PM
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got any in existence?

Probably the natural sattelite of a moon.


"moon" is just a term used to define anything that orbits a plenet. that's not mane-made of course. makes it easier for joe schmoe to say "moon" then "satellite".

sa-tah-wha? moon. aaah, that's easier.
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  Trader Rating: 0 · #34  
Old August 20th, 2006, 03:20 PM
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Quote:
Originally Posted by pyromonkey
I'd say if it has a natural sattelite, it's a planet.

Otherwise it's just a satellite of a star.....which is technically what "planets" are.

What about asteroids? A lot of them have moons also. See partial list below.
Note 1: Pluto is now known to have 3 moons.
Note 2: Asteroids and comets are hard to distinguish. Many asteroids are probably comets in a dormant state.
A comet may just be an asteroid with a certain composition and density.
Note 3: Besides Pluto two asteroids have at least two moons.
Code:
Name of            Diameter of    Name of               Diameter of  Semimajor   Orbital
Asteroid           Asteroid (km)  Moon                  Moon (km)    Axis (km)   Period (days)
Pluto              2,320          Charon                1,206        19,640        6.387
                                  Hydra                   130        64,780       38.207
                                  Nix                     100    `   48,700       24.856
26308) 1998 SM165    238          S/2001 (26308) 1         78        11,310      130
(47171) 1999 TC36    379          S/2001 (47171) 1        142         7,720       50.4
(66391) 1999 KW4       1.2        S/2001 (66391) 1          0.36          2.6      0.758
2003 EL61          1,400          S/2005 (2003 EL61) 1    310        49,500       49.12
                                  S/2005 (2003 EL61) 2    170        39,300       34.7
90 Antiope A         110          90 Antiope B            110           170        0.689
1862 Apollo            1.7        S/2005 (1862) 1           0.08          3    
3749 Balam             7          S/2002 (3749) 1           1.5         310      110
1313 Berna            15          S/2004 (1313) 1          15            16        1.061
107 Camilla          223          S/2001 (107) 1            9         1,235        3.71
4492 Debussy          10          S/2004 (4492) 1          10             1.109
3671 Dionysus        1.5          S/1997 (3671) 1           0.4           2.2      1.155
130 Elektra          182          S/2003 (130) 1            4         1,252        3.92
283 Emma             148          S/2003 (283) 1           12           596        3.36
1509 Esclangona       12          S/2003 (1509) 1           4           140       12
45 Eugenia           215          Petit-Prince             13         1,190        4.766
854 Frostia           14          S/2004 (854) 1           15             1.572
69230 Hermes           0.4        S/2003 (69230) 1          0.4           1        0.579
121 Hermione         240          S/2002 (121) 1           18           768        2.582
379 Huenna            92          S/2003 (379) 1            7         3,400       80.8
243 Ida               60          Dactyl                    1.6         108        1.54
22 Kalliope          181          Linus                    38         1,065        3.59
809 Lundia            15          S/2005 (809) 1 
Patroclus            122          Menoetius               113           680        4.283
Pulcova              137          S/2000 (762) 1           20           810        4
87 Sylvia            287          Remus                     7           706        1.379
                                  Romulus                  18         1,356        3.65
1089 Tama             11          S/2003 (1089) 1           8            11        0.685
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  Trader Rating: 1 · #35  
Old August 20th, 2006, 03:35 PM
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And does not one of the moons of jupiter have a moon?

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Old August 20th, 2006, 04:06 PM
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Jupiter SHOULD have been a star. It's not big enough though.

Then how about calling classefied things as planets, then as whatever they used to be.

Like calling everyone human (their general name, like asteroid or satellite) but then with races like African or Japanese (planet).

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Old August 20th, 2006, 04:07 PM
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Quote:
Originally Posted by CYMARTINDALE
And does not one of the moons of jupiter have a moon?

Not that I know of. It would be difficult to maintain with all the perturbations in the existing Jupiter system. Currently Jupiter has at least 63 moons.

An interesting thing I did not mention in my previous post was how astronomers were able to make such strides in finding the moons of the asteroids. The Hubble Space Telescope helped a little but the majority of the work was done using ground-based telescopes.

In the last few decades astronomers have been using what is called adaptive optics. Astronomers use lasers to sample to atmosphere above the telescope to find out what the perturbations are. They use this information in real-time to move actuators underneath the telescopes main mirror to change its shape to cancel out the distortions from atmospheric turbulance. This has worked out so well that many times the largest earth-based telescopes are able to outperform even the Hubble Space Telescope for solar system observations.

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Old August 20th, 2006, 04:16 PM
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Besides, isn't hubble scanning the Americ- I mean the terrorists?

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Old August 20th, 2006, 04:40 PM
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Quote:
Originally Posted by pyromonkey
Besides, isn't hubble scanning the Americ- I mean the terrorists?

The Hubble can not be used for ground observations. However there are many other spy satellites that have similar optics that are designed for such work. An example is the KH-12 reconnaissance satellite. It is 4.5 meters in diameter and is over 15 meters long. Its mirror is probaly as large or larger than the Hubbles' 2.4 meter mirror. It has a maximum resolution somewhere between 4 and 6 inches.

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Old August 20th, 2006, 05:00 PM
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