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PostPosted: Sun May 09, 2021 3:01 pm 
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Code:
Num:  572460
Star:      M0 V 
Age:       4.635
Zmass:     0.453
Mass:      0.453
ZLum:      0.0318493
Lum:       0.0326181
Rad:       0.409
Metal:     2
Phase:     1
 
ZAMS Inner Zone =    0.171   Current Inner Zone =    0.173
ZAMS Hab Zone   =    0.341   Current Hab Zone   =    0.345
ZAMS Earth Equiv=    0.178   Current Earth Equiv=    0.181
ZAMS Outer Zone =    0.453   Current Outer Zone =    0.458
 
Num    AU        ecc       type      mass     den        rad        peri       aph      hill     inner     outer      4:1       3:2     migrate
 1     0.200     0.042     4.000     0.001  5000.000  5000.000     0.192     0.208     0.002     0.186     0.216     0.079     0.153     0.582
 2     0.280     0.085     4.000     0.011  5000.000 10000.000     0.256     0.304     0.006     0.240     0.332     0.111     0.214     0.582
 3     0.476     0.032     4.000     0.000  3500.000   250.000     0.461     0.491     0.000     0.460     0.492     0.189     0.363     0.582
 4     2.944     0.140     3.000     3.692  3324.050 79553.000     2.531     3.357     0.404     1.520     5.783     1.168     2.246     0.582
 5     6.888     0.066     1.000     0.112  1627.800 31490.000     6.433     7.343     0.295     5.547     8.820     2.734     5.257     0.582
 6    12.399     0.035     1.000     0.060  1205.640 28332.000    11.969    12.828     0.433    10.671    14.559     4.920     9.462     0.582
 7    22.318     0.148     1.000     0.140  1405.500 35626.000    19.018    25.617     1.031    16.442    31.800     8.857    17.031     0.582
Orbit = 0.200 AU, Radius =  5000. km, Density = 5000. kg/m3, Mass= .001 MJ, BBTemp=  264.8 K, MMW=     9.42, Atm=   6 *
Orbit = 0.280 AU, Radius = 10000. km, Density = 5000. kg/m3, Mass= .011 MJ, BBTemp=  223.8 K, MMW=     1.99, Atm=  17
Orbit = 0.476 AU, Radius =   250. km, Density = 3500. kg/m3, Mass= .000 MJ, BBTemp=  171.6 K, MMW=  3489.03, Atm=   0


Superjovians are rare in M V systems - only 6 systems had them out of about 500,000 M V systems generated.
This star's about as old as Sol and has a tidelocked habitable world slightly smaller than Earth in the first orbit at 0.2 AU, a subgiant as the next world and then a rockball. Then a 3.7 MJ supergovian on a fairly eccentric orbit, and then three Neptunes further out. The habitable world has a high eccentricity for a close world, so it's probably got significant tidal heating too.

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PostPosted: Wed Jun 09, 2021 6:44 pm 
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Does this system assume that a world that could develop some sort of oxygen producing life eventually will? Or is “habitable” more like “ideal terraforming candidate”?


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PostPosted: Wed Jun 09, 2021 9:17 pm 
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if it's listed as atm 4-9 then it's basically a breathable atmosphere with oxygen. Might need some small tweaks or a breathing mask but generally "shirt-sleeve".
In the M0 V system that'd be a habitable but tidelocked world with a breathable atm.

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PostPosted: Wed Jun 16, 2021 3:06 pm 
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Quote:
if it's listed as atm 4-9 then it's basically a breathable atmosphere with oxygen.


I was wondering more how you determined a given world is atm 4-9 and not a lifeless world with atm A. If it meets all the requirements (e.g. system is old enough, hab zone, etc) does life "find a way", or still a random chance that life might not happen?


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PostPosted: Wed Jun 16, 2021 3:26 pm 
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basically it's a random roll, but if it's a big enough world in the habitable zone around a star that's old and stable enough then there's a chance of a habitable atmosphere. If it's not in that situation then there's a vastly reduced (or more likely no) chance of a breathable atmosphere. Even if it is in the perfect spot and the right size there's still a chance that it'll be a dead world though - it doesn't work out all the time.

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