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Faraway System: a Scientific Analysis

 
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aurora
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Joined: 10 Oct 2008
Posts: 50

PostPosted: Fri Aug 05, 2011 3:31 am    Post subject: Faraway System: a Scientific Analysis Reply with quote

Okay, here's a detailed analysis and calculations of the Faraway system in terms of real-world (not mad) astronomy, astrophysics and celestial mechanics. You see, I'm an astronomy geek and just couldn't resist it. Impossibilities, contradictions and plain skipped homework in canon Lost Colony data are noted and corrected.

0: The Faraway Star
Mass: 1,2 Msol
Luminosity: 3 Lsol
Diameter: 0,008 au (1,196,800 km) (calculated from canon spectral class and calculated luminosity)
Spectral class: G4(IV) subgiant
Age: 6,34 billion years (calculated from the canon spectral class)
Notes: Debbi erroneously notes that this star is a G4 and thus hotter and brighter than Sol's G2. That's bad, bad science. The Faraway Star IS three times brighter than Sol, not because of its spectral class, but because it's a subgiant. G4 is actually cooler than G2, and the Faraway Star is brighter despite of this because of its greater mass and radius. The FS has to be a subgiant; if it's a main sequence G4(V), it will be much dimmer and Banshee will have to have a much shorter year than canon to stay warm.
This also means that a) in prehistoric eras (440 million years ago and further), when the FS was still an F8(V) main-sequence, Banshee had to be colder, and billions of years ago much colder, and b) Banshee still has about 460 million years of stable temperature, and afterwards the FS will go red giant and fry it. 440 million years is a relatively small time to develop intelligent life, but given that Banshee is an intelligent planet, she could engineer evolution to go faster.

1: Cinder
Orbital radius: 0,13+-0,02 au (calculated)
Annual period: 0,043 years, 0,5 local days (from canon we know it has days and nights, so it isn't tide-locked and must be in resonance like Mercury)
Local day: 761 hours (calculated)
Diameter: 0,82 Earth (anything less and it won't be capable of tectonics)
Average density: 6,1 g/cm3 (it's rich in heavy metals so it has to be really dense)
G: 0,9 g (8,8 m/s2) (calculated from density and diameter)
Escape velocity: 9,6 km/s (from here all calculated)
Average surface temp: 626 deg C
Solar infall: 18279% Earth
Atmosphere: None

2: Ash

Orbital radius: 0,56+-0,03 au (calculated)
Annual period: 0,385 years, tide-locked (canon doesn't say it isn't, and it should be because of its position)
Local day: Infinite, dummy. It's tide-locked, you know
Diameter: 0,4 Earth (random small diameter)
Average density: 3,3 g/cm3 (typical for these)
G: 0,24 g (2,3 m/s2) (calculated from density and diameter)
Escape velocity: 3,5 km/s (calculated)
Average surface temp: 200 deg C (295 dayside, -226 nightside)
Solar infall: 995% Earth
Atmosphere: None

3: Azreel

Orbital radius: 1,1+-0,2 au (calculated)
Hydrographics: 10% (canon states it is wet, ie has water vapor unlike Venus, so it has to have at least 10% of liquid water)
Annual period: 1,09 years, 322,5 local days (calculated)
Local day: 29,6 hours (calculated)
Diameter: 0,82 Earth (random, typical for a venus type planet)
Average density: 5,5 g/cm3 (like Earth)
G: 0,82 g (8 m/s2) (calculated)
Escape velocity: 9,2 km/s (calculated)
Average surface temp: 524 deg C (calculated from greenhouse effect)
Solar infall: 249% Earth
Atmosphere: N2, H2O 82 bar (calculated)
Notes: Debbi states that Azreel's atmosphere is mostly nitrogen. To be precise, water vapor has to be a more major atmospheric constituent than nitrogen, since the former is a greenhouse gas and the latter isn't. In my own expanded version of the Faraway system, the main greenhouse gas is ghost rock vapor, but this calculation is based on canon and hard science, not fan-creations and mad science.

4: Banshee
Orbital radius: 1,6 au (calculated from canon year)
Hydrographics: 80% (canon)
Axial tilt: 20 deg (from canon)
Annual period: 1,86 years, 700 local days (from canon)
Local day: 23,3 hours (from canon)
Diameter: 0,94 Earth (calculated directly from canon circumference)
Average density: 5,3 g/cm3 (calculated)
G: 0,9 g (8,8 m/s2) (from canon)
Escape velocity: 10 km/s (from here all calculated)
Average surface temp: 21 deg C
Solar infall: 122% Earth
Atmosphere: N2, 02 0,90 bar
Notes: I deemed Banshee's canon characteristics as the basis from which to calculate everything else. No canonical data about Banshee was changed or invalidated in this calculation; however, canonical data regarding other celestial bodies of the Faraway system was changed and marked as errors if it contradicted what we know about Banshee directly or via the laws of astrophysics and celestial motion.

4a: Banshee's Moon

Orbital radius: 480000 km (calculated)
Orbital period: 42,3 Earth days (calculated)
Diameter: 0,30 Earth (by fiat)
Average density: 4,4 g/cm3 (typical for rocky moons)
G: 0,24 g (2,4 m/s2) (calculated)
Escape velocity: 3 km/s (from here all calculated)
Average surface temp: 7 deg C
Solar infall: 122% Earth
Atmosphere: None
Notes: Almost no canonical data is given about Banshee's moon, so I kinda derived its statistics from Banshee's day and year and fiat data based on our own Moon.


5: The Belt

Orbital radius: 4,5 au (calculated)
Annual period: 8,71 years
Average surface temp: -106 deg C
Solar infall: 16% Earth
Notes: It took some veeery strong magic from Dark to remain warm enough for Craghans to live there. Though who knows how did they look, probably they were furry and shaggy and cold-resistant because of that. Probably they were even ammonia-based life.

6: Chanoukara

Orbital radius: 10 au (calculated)
Annual period: 28,9 years, 10964,9 local days (calculated)
Local day: 23,1 hours (calculated)
Diameter: 14 Earth (typical for a brown dwarf)
Average density: 18 g/cm3 (calculated)
G: 43 g (426 m/s2) (calculated)
Escape velocity: 272 km/s (from here all calculated)
Average surface temp: 1500 deg C (spectral class late L)
Solar infall: 3% Earth
Atmosphere: H2, He superdense
Moons: 2 inner minor moons, 2 major moons, 5 outer minor moons (calculated)

6a: Base Prime
Orbital radius: 1040000 km (calculated)
Orbital period: 1,37 Earth days (calculated)
Diameter: 0,47 Earth (by fiat, but typical for a Mars-like world)
Average density: 4,4 g/cm3 (typical)
G: 0,37 g (3,7 m/s2) (calculated)
Escape velocity: 4,7 km/s (calculated)
Average surface temp: -62 deg C before, -10 after adding atmosphere
Solar infall: 3% Earth from the Faraway Star and much more from Chanoukara (I didn't bother to calculate)
Atmosphere: CO2, N2 0,04 bar (terraformed to 0,5 bar)
Notes: The canonical version of Base Prime, warmer and with almost-breathable atmosphere, is blatantly unrealistic. If the moon is close enough to Chanoukara to be warm, it will be volcanized by tidal forces and become Io-like. To have an almost-breathable atmosphere with oxygen, it has to have life of its own, of which it has none. This more realistic version of Base Prime is more like Mars (partially terraformed Mars with added atmosphere, to be precise). The N2/CO2 air can still be used for breathing through a peroxide mask that converts CO2 to O2.

7. Johnson's Folly

Orbital radius: 22 au (calculated)
Annual period: 94,2 years, 45413,1 local days (calculated)
Local day: 18,2 hours (calculated)
Diameter: 10 Earth (typical for a medium-sized gas giant)
Average density: 1,1 g/cm3 (calculated)
G: 2 g (20 m/s2) (calculated)
Escape velocity: 50 km/s (from here all calculated)
Average surface temp: -197 deg C (calculated)
Solar infall: 1% Earth
Atmosphere: H2, He superdense
Moons: 5 inner minor moons, 4 major moons, 1 outer minor moon (calculated)

8. Charon

Orbital radius: 44 au (calculated, cubewano)
Annual period: 266,4 years, 175165,5 local days (calculated)
Local day: 13,3 hours (calculated)
Diameter: 0,28 Earth (fiat; rather large for a KBO)
Average density: 2,8 g/cm3 (calculated; mostly icy)
G: 0,14 g (1,4 m/s2) (calculated)
Escape velocity: 2,2 km/s (from here all calculated)
Average surface temp: -236 deg C
Solar infall: Negligible, less than 1% Earth
Atmosphere: all frozen
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Who the hell is that damn Irishman named Tables O'Doom?


Last edited by aurora on Fri Aug 05, 2011 11:02 am; edited 1 time in total
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ScooterinAB
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Joined: 22 Nov 2005
Posts: 488

PostPosted: Fri Aug 05, 2011 10:19 am    Post subject: Reply with quote

Well done. I was working on a calendar system some time back and hit some snags. It's cute that Earthlings like to refer to Earth time, but after the near 20 some years they would have been on Banshee, at some point you would start measuring from the local time. I was also trying to figure out some full moon rotations (werewolves and crazy magic are cool), but I don't recall settling on anything.

I'd like to work with you to polish up what I have, and to write up some material on how to use your numbers.
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aurora
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PostPosted: Fri Aug 05, 2011 11:04 am    Post subject: Reply with quote

Uh well, you can use these data to calculate phases of Banshee's moon. I'll help if I can.
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