List of requirements for being a planet (WIP) - help please

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List of requirements for being a planet (WIP) - help please

Post by marasama on 15th November 2008, 7:38 pm

This will be a list of items that will qualify it being a planet. No arbitrary stats, of course.

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Re: List of requirements for being a planet (WIP) - help please

Post by marasama on 15th November 2008, 7:40 pm

The list:
1) Mass
2) Radius / Diameter
3) Shape, spherical, spheroid, others
4) Location, around a star, substar, free floating
5) Orbits, only a star, substar, no star, another planetary object
6) Able to clear its orbit of other objects
7) Origins, from a disk or collapse globule. Maybe it formed to a Brown Dwarf but a nearby bright star reduced its mass
8) A solid surface, or least a liquid surface
9) Able to maintain an atmosphere
10) Does not create a cometary tail
11) ...

Any suggestions, please add.


Last edited by marasama on 16th November 2008, 12:41 am; edited 2 times in total

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Re: List of requirements for being a planet (WIP) - help please

Post by Sirius_Alpha on 15th November 2008, 9:55 pm

1 and 2 could perhaps be taken together. If a lone 1 km asteroid is found in orbit of a star, is it a planet? Perhaps we should consider the IAU's "hydrostatic equilibrium".

7) "A solid surface, at least a liquid surface."

Did fluid encompass both liquid and gas?
In any event, what other sort of surface could a planet have? Other than solid/liquid/gas?

The current IAU definition doesn't seem very arbitrary to me, except for the part about gravitationally dominating it's orbit. This would cause issues with trojan planets.

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Re: List of requirements for being a planet (WIP) - help please

Post by marasama on 16th November 2008, 12:38 am

Had a typo. It is suppose to be, "A solid surface, or at least a liquid surface."

But for me, I believe it should just be as simple as, mass. Size, to me, is irrelevant. I am just listing out what is an issue in the past and present.

Eventually, I'll formulate a reason. I just need the list to provide an argument.
I also update the list, again.

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Re: List of requirements for being a planet (WIP) - help please

Post by Sirius_Alpha on 16th November 2008, 2:07 am

Condition 8 excludes gas planets.

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Re: List of requirements for being a planet (WIP) - help please

Post by Lazarus on 16th November 2008, 5:50 pm

I generally go with the rule that if it looks like a planet, swims like a planet and quacks like a planet, then it probably is a planet.

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Re: List of requirements for being a planet (WIP) - help please

Post by Sirius_Alpha on 16th November 2008, 7:40 pm

Though Lazarus' post seems playful, it's probably a good point. Perhaps we don't need a set of definite rules to determine what is a planet, perhaps it can just be commonly agreed upon by it's characteristics and environment.

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Re: List of requirements for being a planet (WIP) - help please

Post by marasama on 16th November 2008, 11:47 pm

Yeah, I am for that.
I just need to make a list to disprove those items on why they are unnecessary.

Question, what is the minimum mass needed to produce heat in the core? Of course, the materials will be a factor.

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Re: List of requirements for being a planet (WIP) - help please

Post by Darkness nova on 18th November 2008, 4:18 pm

Minimum....

Define heat in the core....I say this because an object maybe 100 or so kilos in size that just formed would have "heat in it's core".


Last edited by Darkness nova on 1st December 2008, 8:57 pm; edited 1 time in total

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Re: List of requirements for being a planet (WIP) - help please

Post by marasama on 18th November 2008, 11:51 pm

Ah, yeah.
The amount of heat and the duration before the heat dissipate. I'll need to rethink how to measure that.

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Re: List of requirements for being a planet (WIP) - help please

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