Celestia Forums

Star
Object Statistical Data
Mass (kg) 2.39E+30
Radius (m) 737,500,000
Diameter (km) 1,475,000
Surface Gravity (m/sec?) 292.7
Volume (m?) 1.6794E+27
Density (g/cm?) 1.42
Surface Area (km?) 6,831,462,500,000

Planet
Object Statistical Data
Mass (kg) 8.71E+24
Radius (m) 7,184,500
Diameter (km) 14,369
Surface Gravity (m/sec?) 11.3
Volume (m?) 1.55259E+21
Density (g/cm?) 5.61
Surface Area (km?) 648,310,026
Object Orbital Data
Orbital Distance (AU) 1.169
Orbital Distance (m) 174,879,910,838
Velocity (m/sec) 30,172
Orbital Period (sec) 36,399,766
Orbital Period (days) 421

I was wondering if any one could take a quick look at this planet

The star is Sol like, but has 1.2 times mass; this should just place it in the F5-G0 category, and the planet is 1.169 time further then the earth. Anyway what I was wondering is pure (intelligent) speculation on what the planet would be like around the star.

Thanks

MKruer,

I'm not quite sure what you're asking.

I trust you realize that with Celestia you can create this system yourself

The planet is a gas giant, so it's unlikly there'd be any life similar to ours there.

Where did you get this description?

I think its a hypothetical scenerio he derived...

I think alot depends on the chemistry of the planet itsself...Theres not much to go on except our own solar system...I suppose you could come up with just about anything to a point...but there is also these links that might help you out some:

http://www.dausha.net/sciences/orbits.shtml

http://cfa-www.harvard.edu/iau/lists/MPNames.html

http://www.brandubh.com/worldbuilding.htm

Life might be possible in the upper-atmosphere of a gas-giant, some even belive there is life on Jupiter and Saturn.
However, this life would not be like anything we have here on earth, and would most likely be very primitive creatures.

If theres life on Jupiter, it will also have evolved an protection against heavy radiation, and thunderbolts as powerful as 30 nuclear bombs.

These life-forms will have to live in the very upper reaches of the atmosphere, since the pressure further down would be... crushing.


Stargazer.

Don't forget that the pressure on the outside is balanced by pressure within. There's plenty of life at the bottom of Earth's oceans, for example. It's just that travelling between low and high pressure environments is a bit tricky.

Give all things being equal 1.2 times the mass means 1.44 times the atmospheric pressure. So about 21.6 PSI for the atmosphere.
As for the temperature on the planet this is what I’m having trouble with, mainly because I’m lazy.

But given that the sun averages 5,800 degrees Kelvin. A star that is 1.2 solar masses should have about 6,400 degrees Kelvin this places it between a class F5 and G0

150,000,000km & 5,800 degrees Kelvin
5800/150m^2 = 2.57x10-13 * 510,000,000km surface area = 1.31x10-4 total energy absorbed per square km

earths average temp is 60°F (15°C)

175,000,000km & 6,400 degrees Kelvin
6400/175m^2 = 2.1x10-13 * 650,000,000km surface area = 1.36x10-4 total energy absorbed per square km

So this planet has an average temp of about 60°F (15°C) if the atmosphere was identical to earths

now all I need to do is factor pressure which should be about 1.44 time greater that should mean that the temperature is now about 86°F (21°C)

so depending on the humidity this would either be a hot humid world or a desert world. (guess I need to rethink the star so the planet is more like earth.)

Can someone check over my BS math to see if I got it correct? Its a drastic simplification but should work.