Developing a Workflow – Part IV B: Other Worlds

I’m eager to get to mapping Yaccatrice, so I’m kind of skimming over this step. The Yaccatrene people are pretty well planet-bound, so I’m keeping things pretty simple with respect to the other planets in the system.

I used the GURPS Space 4th edition rules to generate the remaining gas giants(given the type code of GG on the following table). General size class uses the rules on page 110 and the actual radius, density and mass was determined using the rules and table on page 115.

I was tempted to use the 2300AD Snowballing rule for the gas giants, but I think I still need to work on better rules for working out the final density of the body.

I did use the 2300AD rules for size of the other rocky and icy planets in the Cintilla system. Instead of using the charts straight, though, if the chart called for a radius of nD10 x 1000 km diameter, I used nD10-1 x 1000 + 1D10 x 100 + 1D10 x 10 + 1D10 km for a more exact diameter. I then halved the result to get the radius.

The information as detailed on the chart can readily serve as the basis for more detailed worldbuilding on the other worlds, even to the same level of detail that Yaccatrice, itself will attain. For now, I think this is sufficient.

The only other detailing I will add is to note that Niteliting should have a very high albedo icy surface and Stoppen has the remains of a small encampment placed by the crew of the Yardley TC to aid in repair attempts before dropping the passengers off on Yaccatrice, the later would give clues as to the early history of Yaccatrice and how these people ended up where they did.

Since I’m very eager to get on with mapping this planet, I will also go over the basics of Yaccatrice’s atmosphere. As we saw before, Yaccatrice has an effective atmospheric mass of 0.87, giving it a surface pressure 0.67 atmospheres or 674 millibars and an average surface temperature of 306 Kelvins(33º C / 91º F). I know the Absorption factor given in the table on page 84 of GURPS Space 4th ed. should equal (1 – Albedo)1/4. I assumed Yaccatrice would be a Standard Garden planet with a hydrographic fraction of 20% or less, so (1 – Albedo)1/4 would equal 0.95, giving an Albedo of about 0.19 and a Greenhouse factor of 0.16. If the hydrographics come out higher than 20%, I’ll have to recalculate the surface temperature, but since I’m aiming for a desert world, this shouldn’t be a problem. My actual hydrospheric percentage will be determined based on my map, so that is a little up in the air so far. Getting accurate areas off of a map isn’t too difficult, building a map to a precise hydrospheric coverage is… awful. So that’s why I’m saving determination of hydrospheric coverage for after I make a map. I’ll just be careful to keep it under 20%.

The table describing the general parameters for all of the bodies in the Cintilla system is below.

Planet name

type

Semimajor

Axis(a.u.)

Orbital

Period(years)

Radius

(km)

Mass

(Earth masses)

Density

(gm/cm3)

Blackbody

Temperature

(K)

Sky Moon

GG

0.1151

0.0713

(26 days)

77,245

486

1.5

284

Niteliting

Ice

0.2034

0.167

(61.2 days)

4,160

0.167

3.31

213

Stoppen

Rock

0.5098

0.655

(243 days)

2,946

0.07

3.86

135

Viggun

GG

1.363

2.91

(1060 days)

85,535

2,400

5.49

82

Minnimun

GG

1.815

4.46

(1630 days)

45,458

63

0.96

71

Aterice

Ice

6.314

29.0

(10600 days)

1,260

0.004

2.76

38

Farkeld

GG

20.93

175.0

(63900 days)

19,758

11

2.04

21

Hopefully this is of use.
Thank you,
The Astrographer

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