Traveller 5: System Generation: Iomaria, Part 4

The End Result

Iomaria A99889A-8 {1} (B7K-1) [7F08] BDe Im NS G NIL

Trade codes: PH, PA, PI. Naval and Scout bases, Imperial Knight, Marquis and Viscount representatives are present. Travel code Green, and there is a native intelligent lifeform present.

Orbits Tusog, a big planet in orbit 2 with a 248-day year, orbiting every 4 hours. There are 2 gas giants in the system, a smaller gas giant in orbit 0 and a large gas giant out in orbit 9. There are 3 ice worlds and 2 radiation worlds in the system.

Transit times for jump are generally higher due to Tusog's presence. Being tidally locked, one side rarely gets much in the way of sunlight. The dark side is the side facing Tusog, and most of the population lives on the other half of Isomaria. 

The Process

Next, we create the gas giants. As this system has 2 from the PBG (402) from part 1 we have 2 gas giants. Interestingly we have 2 planets in orbit 2: Iomaria and the planet it orbits. Looking at the rules, we place a "BigWorld" in orbit 2. Interestingly, the gas giant table indicates 2 dice, but has a range of 1-13, indicating there is some sort of DM somewhere I can't immediately find. Going with straight 2d6, our first gas giant is a small gas giant (rolled another paid of snake eyes!). This is the size of Neptune, size L. There is a note about fuel skimming needing GG size / 10, so a ship will need at least 2.1G. Apparently in T5, you need at least a M3 to fuel skim. Though honestly, couldn't you just slingshot and use gravity to dip into the atmosphere & get flung back out? Pretty sure that ship from 2010 did not have M3. Of course, it also was not pulling in hydrogen to convert to fuel.

But I digress: we have a size M SGG. Placement is relative to the HZ, which for our KV star is orbit 2. I again roll low, so somehow, we have a small gas giant in orbit 0 around this dwarf orange star. Of course, hot Jupiters have been recently discovered, so we have a hot Neptune-size gas giant in close orbit about the system's main star. Our inner system gas giant has 5 moons.

Our 2nd gas giant is just under Saturn-size, size Q (24). This time I roll box cars - our large gas giant is way out in orbit 9, our about 5 light hours from the sun. This distant GG as 2 moons, but being so far away, probably no one ever visits. Especially at TL 8 which is early interplanetary pretty much.

At this point, we have:

1. Orbit 0 - small gas giant with 5 moons. 
2. Orbit 2 - a big world that is orbited by Iomaria, our main world.
3. Orbit 9 - the large gas giant. 

Total worlds = MW (main world) + GG (gas giants) + Belts + 2D. Apparently then we roll 2D for the remainder of the planets, and there are stereotyped world definitions depending on where the planet ends up. Roll a right in the middle 7, we have 7 additional planets. Going for our 7 additional planets in the order rolled up:

1. rolled a duplicate orbit, so it becomes adjacent to the LGG in orbit 8. Being outside of the habitable zone, rolling on the outer worlds table we have an ice world. Rather than rolling for the space port first, let's roll the stats as that really determines the ports. Especially for an ice planet light hours away from the main world. 768000. We have a standard atmosphere in terms of oxygen and nitrogen, but being an ice planet, without warmers you will die. That 80% hydrosphere is ice-covered oceans. Miles of ice over liquid water heated by the geothermal process. It has no moons. Our end UWP is Y768000-0
2. Orbit 5. a rad world. Assuming radiation everywhere. Y670000-0. Some of the other worlds have fixed stats, and a valid assumption is no one is going to live on a rad world. It has 2 moons. 
3. Orbit 6, another ice world. Y110000-0. A small ice world with a trace of an atmosphere. There are no moons.
4. Orbit 4, yet another ice world. Of course, being outside the habitable zone it is pretty much expected. Y100000-0. Nothing but ice! Maybe frozen methane. Two very tiny moons orbit this munchkin ice world.
5. Orbit 7, another (you guessed it!) ice world. Y456000-0. A slightly larger ice world with a thin atmosphere and no moons.
6. Orbit 10, outside the large gas giant, we have another rad world. Y445000-0. A thin atmosphere tainted with quite a lot of radiation this world boasts 3 moons. Perhaps captured from the large gas giant?
7. the last world rolls on a different column, and we end up with an ice world way out in orbit 12. Y89A000-0 and no moons. 

And we should also roll up our big world, that has a size of 2D + 7 vs the normal 2D - 2. Rolling a 7, we get a size E (14) world. With that size, the flux roll for atmosphere is insidious. Giving environment effects of C2 and P1. With that atmosphere, the surface is liquid, but what sort of liquid? With an insidious atmosphere, and being in the habitable zone, could be something like chlorine. Which - hey, I do have that atmosphere supplement:

The most dangerous of all atmospheric types encountered by Traveller adventurers is the insidious atmosphere, defined as an atmosphere similar in nature to corrosive, but capable of defeating any personal protective measures in 2 to 12 hours.

Going with a chlorine-disulphur atmosphere with chlorine-based seas covering the entire planet. This gives us YECA000-0 as the UWP.

Bringing this all together:

1. Orbit 0 - SGG M with 5 moons
2. Orbit 1 - empty
3. Orbit 2 - Big World Tusog and Iomaria in the habitable zone
4. Orbit 3 - empty
5. Orbit 4 - ice world Y100000-0 with 2 small moons
6. Orbit 5 - rad world Y670000-0
7. Orbit 6 - empty
8. Orbit 7 - empty
9. Orbit 8 - ice world Y768000-0
10. Orbit 9 - LGG Q with 2 moons
11. Orbit 10 - rad world Y445000-0
12. Orbit 11 - empty
13. Orbit 12 - Y89A000-0

Most of the system is only mapped as far as TL-8 can map it, which is actually pretty good. The jump shadow is right inside the 2nd orbit, so Iomaria is not within it's stellar jump shadow. However, Tusog, the big planet it orbits, of course has a larger jump orbit at 100x14k miles or 1,400,000 miles / 2,240,000 km. This is roughly 6 times further than the moon is to Earth! Travel time form jump is going to be longer than most systems. Quick guide for the G drive:

1. M1 8 hours
2. M2 6 hours
3. M3 4.8 hours
4. M4 4 hours
5. M5 3.7 hours
6. M6 3.4 hours

Of course, it may depend on where you precipitate out of jump. And of course, I've not figured the orbit of Iomaria around Tusog. Using Heaven & Earth to input the UWP & information it shows up as orbit 5. I am good with that. I could have just used H&E to do all the work (and for animal encounter tables, yes, I will as I tried in an as-yet unpublished post to create some random tables for the encounter tables. Lots of rolling and flipping through pages - no wonder people prefer to automat a lot of Traveller rule sets!) Using the info from that as well, we now have the following information on our system:

Tusog orbits the sun every 234.8 days, so Iomaria's year is the same. It does orbit Tusog every few hours (according to H&E its roation is 0.022 days which seems...awfully fast). 

Assuming an orbit that the rest of the system mostly adheres to, this also means that Iomaria has false nights: they are behind the big world so in its shadow. It is also tidally locked to Tusog, so people on that side of the planet always have a giant planet visible even in daylight. Which is dim due to the main star being a K0-V star.

And if you got this far - congratulations! There will be 1 more post for Iomaria to wrap it all up in an ISS style document or two. T5 has some forms I should be able to use. I also found the and grant information in the noble character generation in Book 1. I may see if I can roll up our nobles for this planet as well. 

Part 1

Part 2

Part 3