High Atmospheric Pressure!

Jumpin' Jack Flash

Jumpin' Jack Flash
Hi All, :)

While exploring a few days ago I came across this...

Tagged a planet with these specs in Byeia Thaa SU-Y C8 B1

Earth Masses 1.5511
Radius 5,502 Km
Surface Temp 5,205 K

Surface Pressure 4,669,998.5 Atmospheres o_O

Not Landable (not surprising).

Is this surface pressure for real?....or do you think this is some sort of bug / numerical mistake. ?
Oh and just thought to add atmosphere Metallic Vapour , composition of planet 94% Iron, 5.4 silicates.

Jack :)
 
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Alkibiades

Alkibiades
Thats not even close to the record in the S171 sector. They are pretty rare but not worth more than other metal or hmc planets.
 

Agony_Aunt

Agony_Aunt
Wow, as hot as that is, i think at that pressure wouldn't the atmosphere be solid?

Atmosphere is listed as metallic vapour? No elements listed?

Would need a scientist to calculate the state of the gas(es) at that temperature and pressure.
 

varonica

varonica
Seen pressures up in the 20m atmosphere's range, not sure if that's actually possible in the real galaxy or just a quirk of Stellar Forge, doubt if they will ever be landable!
 

Ashnak

Ashnak
No idea which (yes, there are multiple...) gas equation stellar forge is using (never watched that video so far). But if you start compressing a gas, it will, at some point, turn into a liquid (assuming you keep the temperature high enough). Or at least into something that would look and behave like a liquid if you were able to observe it - simply due to the fact that you're packing as many (or more) molecules per volume as you would inside a liquid. It may technically still be a gas in the sense that the individual molecules' energy is higher than its binding energy to its neighbours, but that's not going to help you if the neighbours are crowding in from all sides. If you increase the energy (gravity, temperature) at this point even more, pressure will explode. At least in the model.

In reality, I don't think such a configuration will be stable over appreciable (geological or stellar) timescales. That kind of atmosphere will simply boil off into space.
 

Jumpin' Jack Flash

Jumpin' Jack Flash
Hi All :)

Agony_Aunt said:
Wow, as hot as that is, i think at that pressure wouldn't the atmosphere be solid?

Atmosphere is listed as metallic vapour? No elements listed?

Would need a scientist to calculate the state of the gas(es) at that temperature and pressure.
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Only iron and silicates, supposedly silicate vapour geysers as well.
Okay, just thought to post the planet specs as I'd not come across one with such a high surface pressure before.
Back in the bubble again now, all that exploring has worn me out! 😴

Jack :)
 

Darth Wonko

Darth Wonko
varonica said:
There's a state of matter called Superionic (yes really) and I imagine these planets are very much like that!
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Yeah.. they're saying Earth's core might be superionic rather than solid iron. It's kind of a cool theory. The temperature there is around 6000K. Or, in scientific terms, "really hot". :)
 

Sapyx

Sapyx
To put it in context: the "atmospheric pressure" at the core of Jupiter is estimated to be about 100 million atmospheres, with a temperature around 20,000 K.

So it's entirely reasonable from a laws-of-physics point of view to have a planet with "surface conditions" of 5 million atms and 5000 K. What's not unreasonable is the in-game classification of such a planet: such a planet would actually be a kind of gas giant, rather than a metallic or HMC. It would certainly look like a gas giant from orbit.

Part of the problem is that ED's calculations for "terrestrial" planets do not consider the "mass of the atmosphere" as part of the mass of the planet. This is a reasonable assumption to make for a planet with near-Earth-like surface conditions, as Earth's atmosphere is only a tiny fraction of Earth's mass; the same is true for Mars, or even Venus (even though Venus' atmosphere is 93 times heavier than Earth's, it is still less than a fraction of a percent of the total mass of the planet). But for this edge-case planet, with a 1.5 earth-mass core and 4.669 million atms pressure, by my reckoning the atmosphere would weigh about 1800 times more than the mass of the planet itself - which ought to then turn the planet into a gas giant nine times heavier than Jupiter.
 

Iron Body

Iron Body
My record for the hottest metal rich planet is HD 202088 1 at 47,991 K and surface pressure 600 million atmospheres. Not sure what state of matter even survives at that pressure/temperature.
 
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Darth Ender

D
Iron Body said:
My record for the hottest metal rich planet is HD 202088 1 at 47,991 K and surface pressure 600 million atmospheres. Not sure what state of matter even survives at that pressure/temperature.
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I'd think it's possible to have an iron vapor atmosphere that heavy if you were very close to a very hot star and were very massive.

However, it should look way cooler than it's represented in the game. You'd expect something that hot to be bright and glowing like a star. with a surface that is nearly an iron plasma. Probably some crazy magnetic fields too.

stellar forge is funny in how it does things. We get purple glowy y dwarfs that often are so cold they wouldn't give off any light at all but due to limitations of object class, they do, and we get these planets that can be hotter than a star and more than hot enough to be giving off visible light and ...nothing.
 

Zieman

Zieman
Iron Body said:
My record for the hottest metal rich planet is HD 202088 1 at 47,991 K and surface pressure 600 million atmospheres. Not sure what state of matter even survives at that pressure/temperature.
Click to expand...
Darth Ender said:
I'd think it's possible to have an iron vapor atmosphere that heavy if you were very close to a very hot star and were very massive.

However, it should look way cooler than it's represented in the game. You'd expect something that hot to be bright and glowing like a star. with a surface that is nearly an iron plasma. Probably some crazy magnetic fields too.

stellar forge is funny in how it does things. We get purple glowy y dwarfs that often are so cold they wouldn't give off any light at all but due to limitations of object class, they do, and we get these planets that can be hotter than a star and more than hot enough to be giving off visible light and ...nothing.
Click to expand...
Sounds like the core of a very massive gas giant or small brown dwarf, Stellar Forge just 'forgetting' the 'atmosphere' other than showing the pressure.
 
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