Planet

World Generation Plugin for Fuzion

Step 1: Stellar Data

Fuzion Plug-in

Step 1b: Number of Stars

First, determine the number of stars in the star system.

Roll (3d6) Number of Stars
3-10 Single Star
11-15 Binary Star
16-18 Multiple Star. (Start with two stars; for each, roll again on this chart. Maximum of six stars).

Orbital Period = P = (d3/(M1 + M2))

Step 1b: Star Size

For each star, roll 3d6 to determine the its size.

Roll (3d6) Object Type
3-5 White dwarf (D)
6 Subdwarf (VI)
7-17 Main sequence star (V)
18 Giant (roll to find giant type)
 
Roll (3d6) Giant Type
3 Supergiant (Ia)
4 Supergiant (Ib)
5 Large giant (II)
6-12 Giant (III)
13-17 Subgiant (IV)
18 Unusual object (roll to find object type)
Roll (2d6) Unusual Object
2-3 Protosun
4-6 Variable Star
7-8 Black Dwarf
9-10 Nebula
11 Neutron Star/Pulsar
12 Black Hole

Step 1c: Spectral Class

This one-letter designation describes the colour and temperature of the star.

The common spectral classes are, from hottest to coolest: O, B, A, F, G, K, M. (easily remembered via the mnemonic "Oh, Be A Fine Girl, Kiss Me").

Class O, B, and A stars are the hottest, and are white or blue-white in colour. Class F and G are yellow and medium temperature; these are the most likely to have Earthlike planets. K and M are red and only a few thousand degrees cool.

Class Colour
O Blue
B Blue-white
A White
F Yellow-white
G Yellow
K Orange
M Red

Several other stellar classes are very rare: Class W, or Wolf-Rayet stars, are white-hot, more than twice the temperature of O stars. R, N, and S are giant stars which are so cool that they cannot support Earth-type life in their vicinity. R and N -- nowadays classed together as C -- are dim red, and S is an even dimmer reddish-brown.

Spectral classes are further broken down into ten numerical subclasses, 0 (hot) through 9 (cool). Thus our sun, a G2 star, is hotter than a G5 and cooler than a G0, which in turn is slightly cooler than an F9 or F8.

For each star in the system, determine the stellar class.

Main Sequence

Roll (3d6)

Spectral Class

3-12

M

13

K

14

G

15

F

16

A

17

B

18

O

 
Giants
Roll (2d6) Spectral Class
2-4 A
5-8 K
9-10 B
11 M
12 O
 
Subdwarfs
Roll (1d6) Spectral Class
1-4 M
5 K
6 G


Copyright © 1999 by B.C. Holmes. Last updated November 6th, 1999.
Fuzion copyright © the Fuzion Group, 1997. All rights are reserved.
Star Hero and Hero Games are registered trademarks of Hero Games. All rights reserved.

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