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Distances in the Pact Worlds system


Starfinder General Discussion


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Hi,

with the knowledge of the length of the planetary of each planet it is very easy to calculate the average distances of each planet from the sun using Kepler's third law of planetary motion:
T² = a³
T: time needed for a planet to complete its orbit around the sun (planetary year)
a: distance from the sun in Astronomical Units (AU)

(1 AU is the average distance between Earth and our Sun.)

Aballon: 0.393 AU
Castrovel: 0.63 AU
Absalom Station: 1.00 AU
Akiton: 1.587 AU
Verces: 2.080 AU
The Idari: 2.52 AU
The Diaspora: between 2.52 and 2.924 AU
Eox: 2.924 AU
Triaxus: 46.491 AU
Liavara: 5.241 AU
Bretheda: 9.655 AU
Apostae: 38.941 AU
Aucturm: 62.996 AU

These numbers are the average distance for each planet from the sun. The real distance may varie over the course of a planetary year because of the orbital eccentricity (e.g. Our planet has an orbital eccentricity of 0.0167). And for most Pact Worlds the eccentricity of their orbits are unknown.
The only thing we know is that Triaxus comes closer to the sun than Castrovel but not as close as Aballon. So it is possible to calculate the orbital eccentricity. Which is btween 0.980 and 0.987. And thus its semi-major axis is between 31.255 and 31.403 AU long.


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Great work! Thanks!


Pathfinder Starfinder Adventure Path Subscriber

Where did you find the exact distances for the planets? Also Love the astronomy nerd out!!!


C_Trigger wrote:
Where did you find the exact distances for the planets? Also Love the astronomy nerd out!!!

That's very simple: Kepler's Third Law of Planetary Movement. See link in the original post.


Really? You just got at least 110% Nerd/Geek-Points. :D


To tell the truth, all distances are in relation to the average distance between Absalom Station and its sun of which I have assumed that it is the same as the average distance between Earth and our sun.


I wonder if Triaxus is going to collide someday or is it in one of those odd gravitationally situations like pluto has where orbits cross but never collide.

Oh, anyone else notice Starfinder left out the Ice Belt?


What ice belt? There is definitely no ice belt. I mean, there couldn't be a gathering of ice elementals using cloaking technology given to them by the Azlanti Empire there waiting to attack the Pact Worlds. That's impossible.


CactusUnicorn wrote:
What ice belt? There is definitely no ice belt. I mean, there couldn't be a gathering of ice elementals using cloaking technology given to them by the Azlanti Empire there waiting to attack the Pact Worlds. That's impossible.

Please. Everyone knows the ice belt was consumed in The Incident during the heyday of experimental FTL travel during the Gap, which led to a blanket ban on all attempts at FTL travel through the elemental planes.


FirstChAoS wrote:

I wonder if Triaxus is going to collide someday or is it in one of those odd gravitationally situations like pluto has where orbits cross but never collide.

Oh, anyone else notice Starfinder left out the Ice Belt?

I believe Triaxus's orbit was stated (in its Pathfinder incarnation) to be in defiance of the laws of gravity, suggesting a magical cause for its orbit--which might mean it's been placed so as to avoid collisions, at least for the next several million years or however long whatever magic or magitech used could calculate. I'll have to go look back at Distant Worlds and make sure I'm remembering right.

Which ice belt are you referring to? The Kuiper Belt in our solar system exists (in its current configuration) largely due to gravitational resonance with Neptune, assuming Wikipedia has the current theories right. Given that Aucturn seems to be out beyond that point (and the Pact Worlds system doesn't have any gas giants as far out as Neptune or even Uranus), the conditions for a similar belt may not exist--or it may have been flung further out in the Pact Worlds system than in ours. More likely, though, it's just far enough out from the rest of the Pact Worlds and poor enough in anything anyone cares about that it's largely ignored. I wouldn't be surprised if it shows up in a module someday, though.

If you're talking about the Oort Cloud... well, that's *way* out of the system, so probably no one would have bothered trying to go out that far before Drift travel came along... and why would you? I suppose some scientists might want to explore bits of ice, but it seems unlikely there'd be any profit in doing so for anyone else.

...a bit more on-topic, doesn't it seem a bit odd that the Pact Worlds system has no major natural planets beyond Bretheda? Bretheda is roughly the same distance from the sun as Saturn, meaning there's nothing in the Pact Worlds system like Uranus (semi-major axis ~19 AU) or Neptune (semi-major axis ~30 AU). Apostae is farther out than Neptune and is probably some kind of spaceship, and Aucturn is *way* farther out and is probably some kind of egg or horrific type of life, and neither of them are nearly as massive as one of the ice giants. It may simply be because they didn't want to keep repeating gaseous planets when they were creating the system. :D


As for the pact worlds having no Neptune/Uranus equivalent. I assumed it was an anomaly like our system having no super earths.

This ice belt. https://pathfinderwiki.com/wiki/Ice_Belt


The only problem I have with this solar system is that the orbital space of the Diaspora asteroid belt is too small. In our solar the asteroid belt is much larger and located between the terrestrial planets and the gas giants. It is also the zone in which the gravitational forces of Jupiter prevent the formation of larger celestial bodies (escept small planets).

We only know of the major celestial bodies in the Pact Worlds system but know nothing about satelites, small planets and planetoids (except some in the Diaspora). But the should be a much larger asteroid belt between Eox and Liavara. And there might be Trojans leading or trailing the gas giants.


The Diaspora used to be a planet before Eox blew it (and their own atmosphere) up.


Umbral Reaver wrote:
The Diaspora used to be a planet before Eox blew it (and their own atmosphere) up.

I thought it was two planets. I sort of wonder which the sarcesian's come from.

Oh, I think we should make a generic planet chart with rough planetary distances, sizes, temperatures, gravities, etc. of a few generic planet and star types.

You know. Small hot planet, icy dwarf planet, earth-like world, super earth, gas giant, ice giant, hot jupiter, stars of different sizes and types, etc.

Sort of a tool for planet design.


Barbarossa Rotbart wrote:
To tell the truth, all distances are in relation to the average distance between Absalom Station and its sun of which I have assumed that it is the same as the average distance between Earth and our sun.

Even if it's not that would probably be consider the standard Pact AU.


I've noticed one very big problem: the Diaspora. According to the core rules the mass of all objects in this asteroid belt equals two times the mass of a standard planet. The asteroid belt in our solar system has only a complete mass of 5% of the mass of Earth's moon and covers a much larger space.

Grand Lodge

Barbarossa Rotbart wrote:
I've noticed one very big problem: the Diaspora. According to the core rules the mass of all objects in this asteroid belt equals two times the mass of a standard planet. The asteroid belt in our solar system has only a complete mass of 5% of the mass of Earth's moon and covers a much larger space.

go on...


As I recall the Diaspora used to be two planets that were blown up by the Eoxians (who almost destroyed themselves when they did so). Perhaps the effects of their weapon still lingers and keeps the Diaspora in a tighter orbit? Or perhaps something about the planets themselves does, some magic that used to be innate to them? I think the oddity of the Diaspora is deliberate.


It is quite simple. Our Moon has approximatly a mass of 1.23% of Earth's mass. Thus our asteroid belt has only a mass of ca. 0.0615% of Earth's mass.
Thus the Diaspora has around 3250 times the mass of our asteroid belt and this in a much smaller space.
And that's the problem. The Diaspora was created by the destruction of two planets. The space covered by the Diaspora should be much larger and should reach beyond Bretheda. And most of its mass should have either already left the system or hit other planets.


We know those planets were emulsified, we don't know that they were "blown up" in such a way that the pieces would scatter into new orbits. The real question is why they haven't reformed into micro planets. ("Magic")


Barbarossa Rotbart wrote:

It is quite simple. Our Moon has approximatly a mass of 1.23% of Earth's mass. Thus our asteroid belt has only a mass of ca. 0.0615% of Earth's mass.

Thus the Diaspora has around 3250 times the mass of our asteroid belt and this in a much smaller space.
And that's the problem. The Diaspora was created by the destruction of two planets. The space covered by the Diaspora should be much larger and should reach beyond Bretheda. And most of its mass should have either already left the system or hit other planets.

That's kind of what I'm saying--even the most basic understanding of physics would tell you that the Diaspora should not exist in its present form... so its continued existence as it is must be due to some sort of magical effect.


No Prize: the Elebrian Planet Buster wasn't simply a really big gun. Its effect on the targeted planets literally disintegrated a large chunk of their mass, or perhaps shunted it off into other dimensions. The Diaspora are only composed of the small percent of mass that suffered mere conventional explosion. The rest is either residing in some other dimension, or else provided the energy that launched the remaining fragments into their new orbits ( and fried Eox ).

Also, are we sure that there *wasn't* more debris at some point, and that most of the dangerous rogue pieces weren't disposed of in the interim millenia? I'm imagining the various deities doing stellar cleanup detail, destroying or redirecting into harmless orbits the pieces that threaten inhabited worlds. Less hazardous than the Starstone incident ( since this time, the rocks aren't being imbued with some kind of cosmic destructive force ), but also a lot less glorious.

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Almonihah wrote:
Barbarossa Rotbart wrote:

It is quite simple. Our Moon has approximatly a mass of 1.23% of Earth's mass. Thus our asteroid belt has only a mass of ca. 0.0615% of Earth's mass.

Thus the Diaspora has around 3250 times the mass of our asteroid belt and this in a much smaller space.
And that's the problem. The Diaspora was created by the destruction of two planets. The space covered by the Diaspora should be much larger and should reach beyond Bretheda. And most of its mass should have either already left the system or hit other planets.
That's kind of what I'm saying--even the most basic understanding of physics would tell you that the Diaspora should not exist in its present form... so its continued existence as it is must be due to some sort of magical effect.

The Diaspora also has a river running through it.

A river. In space.


I blame space wizards.


Almonihah wrote:


That's kind of what I'm saying--even the most basic understanding of physics would tell you that the Diaspora should not exist in its present form... so its continued existence as it is must be due to some sort of magical effect.

Also it could possible that the game universe just wasn't meant to be scrutinized with that level of realism, and that there may be no greater reasoning to it other than the lack of world building.


FirstChAoS wrote:

I wonder if Triaxus is going to collide someday or is it in one of those odd gravitationally situations like pluto has where orbits cross but never collide.

Pluto is sometimes closer to the Sun than Neptune and sometimes further away, but I believe its orbital plane is tilted enough that it's not at any risk of colliding with Neptune; the orbits only look like they intersect in a 2-D map.

Quote:


Oh, anyone else notice Starfinder left out the Ice Belt?

The Dominion have to get their matter from somewhere.


Xenocrat wrote:
We know those planets were emulsified, we don't know that they were "blown up" in such a way that the pieces would scatter into new orbits. The real question is why they haven't reformed into micro planets. ("Magic")

Time. Formation of microplanets takes time and the destruction/creation of Diaspora happened fairly recently (in geological timeframe). There might be some residual effects of the Eoxian superweapon in effect (maybe some sort of anti-gravity fields).

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