Talk:Surveys

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Spectral Class table

Stellar Class Data
Roll
1d1000 		Spectral
Class 		Mass
(mSun) 		Radius
(rSun)
 Temp (K)
001-010
 M9V
Red 		0.08 0.1 2,300
011-020 M8V 0.09 0.13 2,450
021-030 M7V 0.10 0.28 2,680
031-040 M6V 0.39 0.45 3,100
041-050 M5V 0.40 0.5 3,200
051-060 M4V 0.43 0.53 3,300
061-070 M3V 0.46 0.57 3,500
071-080 M2V 0.5 0.6 3,600
081-090 M1V 0.5 0.65 3,660
091-100
 M0V 0.5 0.7 3,900
101-120 K9V
Orange 		0.59 0.608 3,930
121-140 K8V 0.62 0.615 3,990
141-160 K7V 0.64 0.630 4,100
161-180 K6V 0.69 0.669 4,300
181-200 K5V 0.70 0.701 4,440
201-220 K4V 0.73 0.713 4,600
221-240 K3V 0.78 0.755 4,830
241-260 K2V 0.82 0.783 5,100
261-280 K1V 0.86 0.797 5,170
281-300 K0V 0.88 0.813 5,270
301-325 G9V
Yellow 		0.90 0.853 5,380
326-350 G8V 0.94 0.914 5,480
351-375 G7V 0.95 0.927 5,550
376-400 G6V 0.97 0.949 5,600
401-425 G5V 0.98 0.977 5,660
426-450 G4V 0.985 0.991 5,680
451-475 G3V 0.99 1.002 5,720
476-500 G2V 1.00 1.012 5,770
501-525 G1V 1.03 1.060 5,860
526-550 G0V 1.06 1.100 5,930
551-570
 F9V
Yellowish-white 		1.13 1.167 6,050
571-590 F8V 1.18 1.221 6,180
591-610 F7V 1.21 1.324 6,280
611-630 F6V 1.25 1.359 6,350
631-650 F5V 1.33 1.473 6,550
Spectral
Class 		Mass
(mSun) 		Radius
(rSun)
 Temp (K)
651-670 F4V 1.38 1.533 6,670
671-690 F3V 1.44 1.578 6,750
691-710 F2V 1.46 1.622 6,820
711-730 F1V 1.50 1.679 7,020
731-750 F0V 1.61 1.728 7,220
751-762
 A9V
White 		1.75 1.747 7,400
763-774 A8V 1.77 1.748 7,590
775-786 A7V 1.81 1.750 7,760
787-798 A6V 1.83 1.775 7,910
799-810 A5V 1.86 1.785 8,100
811-822 A4V 1.88 1.794 8,250
823-834 A3V 1.93 1.861 8,600
835-846 A2V 1.98 2.117 8,800
847-858 A1V 2.05 2.136 9,300
859-870 A0V 2.18 2.193 9,700
871-878 B9V
Blue-white 		2.75 2.49 10,700
879-886 B8V 3.38 2.86 12,300
887-894 B7V 3.92 2.94 14,000
895-902 B6V 4.30 3.27 14,500
903-910 B5V 4.70 3.36 15,700
911-918 B4V 5.10 3.46 16,400
919-926 B3V 5.40 3.61 17,000
927-934 B2V 7.30 4.06 20,600
935-942 B1V 11.00 5.71 26,000
943-950 B0V 17.70 7.16 31,400
951-955
 O9V
Blue 		19.63 7.51 33,300
956-960 O8V 23.00 8.50 35,100
961-965 O7V 30.85 9.52 37,100
966-970 O6V 43.71 10.71 39,500
971-975 O5V 60.00 12.00 41,400
976-980 O4V 85.31 13.43 42,900
981-985 O3V 120.00 15.00 44,900
986-990 O2V 125.34 15.93 47,000
991-995 O1V 142.3 17.17 48,900
996-000 O0V 159.26 18.41 50,900

Test Case: New Intrasystem Surveys

Intrasystem surveys are completed by vessels as they approach the target star system, usually within the Oort orbit of that system. The survey takes 1d10 days, usually to the maximum length when there are indications of additional planetary bodies not fully identified. The ship typically does not need to enter the system in order to complete the survey.

Part 1: Maximum Number of Planets

4. Intrasystem Survey – 1d10 days (Part 1)
A. Main Sequence Stars Roll for number of planets:
O (Blue) none
B (Blue-white) 3d6
A (White) 3d6-1
F (Yellow-white) 3d6-1
G (Yellow) 3d6-2
K (Orange) 3d6-2
M (Red) 3d6-2
B. UV Sequence Stars Roll:
3d6/2 (and all are charred rockballs)
C. IR Sequence Stars/Blackholes none



Part 2: Bode's Law

Bode's Law is a hypothesis that the bodies in some orbital systems, including Sol's, orbit at semi-major axes in a function of planetary sequence. In other words, it can be used to determine how far out from a star each planet would orbit.

Step 1: The first orbit lies at a distance of (1d6*0.1) astronomical units (AU) from the star, regardless of star class. Therefore, around any given star, the first orbit could lie anywhere from 0.1 to 0.6 AUs from the center of the star's mass. This distance (D) is also used in determining the orbital distances of all other planets.

Step 2: Each star applies what is referred to as Bode's Constant (B) to the formula. As the word 'constant' suggests, the B value, once determined, does not change (within that system). For M-class stars, B is always 0.2. For all other star classes, it can be (equally) 0.3, 0.35 or 0.4, randomly determined.

Step 3: The following formula is applied to each sequential orbit, in order to determine its distance (in AUs) from the star:

Orbit 1: D
Orbit 2: D + B
Orbit 3: D + 2B
Orbit 4: D + 4B:
Orbit 5: D + 8B
Orbit 6: D + 16B:
Orbit 7: D + 32B:
Orbit 8: D + 64B:
Orbit 9: D + 128B:
Orbit 10: D + 256B:
Orbit 11: D + 512B:
Orbit 12: D + 1,024B:
Orbit 13: D + 2,048B:
Orbit 14: D + 4,096B:
Orbit 15: D + 8,192B:
Orbit 16: D + 16,384B:
Orbit 17: D + 32,768B:
Orbit 18: D + 65,536B:

Part 3: Assigning Orbits to Zones

Each orbit falls into one of four zones: in the first, the red zone, the heat and gravity of the star prevent any planets from forming at all. Planets form in the the next three zones (yellow, green, blue) according to the conditions that exist in each one. Past a certain point, the outer boundary, the star’s gravity is no longer strong enough to form or hold planets. Per the following table, if an orbit falls within the red zone (measured in AUs) or past the outer boundary, consider it empty. For all others, note which zone it falls in.

Star Class Near Inner Green Outer Far
B < 5.5 5.5 - 27.4 27.5 - 37.4 37.5 - 2,690 > 2,690
A < 0.8 0.8 - 2.5 2.6 - 4.2 4.3 - 130 > 130
F < 0.4 0.4 - 1.2 1.3 - 2.1 2.2 - 68 > 68
G > 0.2 0.2 - 0.5 0.6 - 1.0 1.1 - 32.4 > 32.4
K < 0.08 0.08 - 0.25 0.26 - 0.42 0.43 - 14.4 > 14.4
M N/A 0 - 0.025 0.026 - 0.042 0.043 - 1.6 > 1.6
D N/A 0.08 - 0.25 0.26 - 0.42 0.43 - 25.6 > 25.6


Part 4: Planet Classes per Zones

Reference: Planetary Classifications

Near Zone
Roll 1d100 Planet
Class
01 - 45 empty
11 - 50 BNote 1
51 - 75 D
76 - 83 J
84 - 95 V1
96 - 97 W
98 - 00 Z
Inner Zone
Roll 1d100 Planet
Class
01 - 15 empty
16 - 33 BNote 1
34 - 47 D
48 - 56 ENote 1
57 - 64 FNote 2
65 - 70 GNote 3
71 - 75 H
76 - 79 J
80 - 82 N1Note 3
83 - 85 QNote 3
86 - 90 V1/V2Note 4
91 W
92 - 97 YNote 3
98 - 00 Z
Green Zone
Roll 1d100 Planet
Class
01 - 05 empty
06 - 07 ANote 1
08 C
09 - 10 D
11 - 13 ENote 1
14 - 16 FNote 2
17 - 19 GNote 3
20 - 22 HNote 3
23 - 25 J
26 - 30 KNote 3
31 - 35 LNote 3
36 - 61 MNote 3
62 - 71 ONote 3
72 - 77 PNote 3
78 - 80 QNote 3
81 - 82 S
83 - 84 T
85 U
86 - 94 V1/V2Note 4
95 - 96 W
97 - 99 YNote 3
99 - 00 Z
Outer Zone
Roll 1d100 Planet
Class
01 - 20 empty
21 - 22 ANote 1
23 - 32 C
33 - 42 D
43 ENote 1
44 FNote 2
45 GNote 3
46 HNote 3
47 - 56 I
57 - 76 J
77 N2Note 3
78 - 79 QNote 3
80 - 84 S
85 - 89 T
90 U
91 - 93 V1/V2Note 4
94 - 95 W
96 YNote 3
97 - 00 Z
Far Zone
Roll 1d100 Planet
Class
01 - 75 empty
76 - 90 D
91 - 95 QNote 3
96 - 99 YNote 3
00 Z


Note 1: If the host star is more than 1 billion years old, roll again.
Note 2: If the host star is more than 3 billion years old, roll again.
Note 3: If the host star is less than 4 billion years old, roll again.
Note 4: When both V1 & V2 Super Terrestrials are available (Inner, Green, & Outer), roll 1d10: 1 - 7, V1 is the result; 8-10, V2 is the outcome.

Determining Orbital Durations (Years)

1. Determine base mass:

Stellar Mass
Star Types Solar Masses
D (White dwarf) 0.36
O (Blue) 15-90
B (Blue-white) 5.9
A (White) 1.86
F (Yellow-white) 1.2
G (Yellow) 0.98
K (Orange) 0.63
M (Red) 0.2


2) Add or subtract 1d10% from base mass for specific mass.

3) Compute the orbital period using this formula: P = sqrt((D^3)/M), i.e., square root of D3 divided by M, where:

  • P = period in standard years (to third decimal); also list (in parenthesis) standard days (converted as by multiplying years by 365.24, to first decimal).
  • D = Distance, in AUs (as pre-determined by planetary surveys)
  • M = specific mass of star

Determine Rotation Durations (Days)

1) Roll 2d6-2 for base hours.

2) Apply this formula: P = 4(B) + 5 + (M/D), where:

  • P = period in total hours (to second decimal)
  • B = base hours
  • M = star's specific mass
  • D = Distance, in AUs (as pre-determined by planetary surveys)

3) If the final result is greater than 40, there is a 50% chance it has no rotation (i.e., "tidal locked").


Determine Atmospheric Density (expanded)

1. Classes A, B, C, D, and Z worlds automatically have "None/Trace (less than 0.01 atm)."

2. For Classes E, F, G, H, K, L, M, O, and P worlds, roll 3d6/10 to determine Atmospheric Mass (M). For Class Q, roll 1d10 on the following table:

  • 1: Very Thin
  • 2: Very Thin to Thin
  • 3: Very Thin to Standard
  • 4: Very Thin to Dense
  • 5: Thin
  • 6: Thin to Standard
  • 7: Thin to Dense
  • 8: Standard
  • 9: Standard to Dense
  • 10: Dense

For N & Y class world’s, atmospheric mass is between 1.21 (Dense) to 10 atms (Very Dense).

3. The Pressure Factor (P) for each of these worlds is 1, except for Y (which is randomly either 100 or 500).

4. Surface Gravity (S) is also a consideration.

5. Determine the atmospheric pressure by the following formula: M * F * S

Determine Temperatures by Zone

1) Roll high temperatures (Fahrenheit) for each of the following zones:

Class H (Desert)
Zone Extreme
High		 Optimum
Max		 Optimum
High		 Average Optimum
Low		 Optimum
Min		 Extreme Low
Polar 120 85 73 67 61 45 0
Temperate 150 111 98 92 86 76 45
Tropical 180 134 119 111 103 97 70
Equatorial 210 157 139 130 121 115 100
Class K (Adaptable)
Zone Extreme
High		 Optimum
Max		 Optimum
High		 Average Optimum
Low		 Optimum
Min		 Extreme Low
Polar 77 19 0 -10 -20 -49 -128
Temperate 117 72 57 50 43 20 -40
Tropical 151 109 95 88 81 67 24
Equatorial 188 136 119 110 101 92 55
Class K planets have the same temperature ranges as Classes L & M. However, the thin atmosphere typically sees the more extreme colder
side of each zone's range for a majority of the time, while the abundance of carbon dioxide allows heat to quickly build during the parent star's solar events.
Classes L (Marginal) & M (Terrestrial)
Zone Extreme
High		 Optimum
Max		 Optimum
High		 Average Optimum
Low		 Optimum
Min		 Extreme Low
Polar 77 19 0 -10 -20 -49 -128
Temperate 117 72 57 50 43 20 -40
Tropical 151 109 95 88 81 67 24
Equatorial 188 136 119 110 101 92 55
Class O (Pelagic)
Zone Extreme
High		 Optimum
Max		 Optimum
High		 Average Optimum
Low		 Optimum
Min		 Extreme Low
Polar 89 24 2 -9 -20 -42 -109
Temperate 108 67 54 46 39 22 -34
Tropical 139 100 87 81 74 62 22
Equatorial 173 126 110 102 94 85 50
Class P (Glaciated)
Zone Extreme
High		 Optimum
Max		 Optimum
High		 Average Optimum
Low		 Optimum
Min		 Extreme Low
Polar -3 -61 -80 -90 -99 -130 -210
Temperate 37 -20 -39 -48 -57 -95 -190
Tropical 77 19 0 -10 -20 -49 -128
Equatorial 117 72 57 50 43 20 -40

Determine Populations

Base Populations

The base population calculation only applies to the following classes of worlds: C, D, G, H, K, L, M, O, P, Z.

1) Assign the appropriate points for the relevant Planet Class:

  • C, D, G, K, Z: 0
  • H, P: 1
  • L, O: 2
  • M: 3

2) Assign the following points for the respective Atmospheric Densities:

  • None/Trace (less than 0.01 atm): -1
  • Very Thin (0.01-0.5 atm): 0
  • Thin (0.51-0.8 atm): 1
  • Standard (0.81-1.2 atm): 3
  • Dense (1.21-1.5 atm): 2
  • Very Dense (1.51-10 atm): 1

3) Assign the indicated points per the world's gravity:

  • 0.6: 1
  • 0.7: 2
  • 0.8-1.0: 3
  • 1.1: 2
  • 1.2: 1
  • 1.3: 0
  • 1.4-1.5: -1

4) Assign the following points for the respective role and opportunities for agriculture:

  • 0% - 5% (Predominantly land covered): 0
  • 6% - 25% (One mega-continent with various small island chains): 1
  • 6% - 25% (Several large continents with a few small continents and island chains): 2
  • 26% - 77% (Several large continents with several small continents and island chains): 3
  • 26% - 77% (Several large continents with a few small continents and island chains): 3
  • 26% - 77% (One large continent with several small continents and island chains): 3
  • 26% - 77% (One large continent with a few small continents and island chains): 2
  • 26% - 77% (Many small continents with many island chains): 2
  • 26% - 77% (Many small continents with several island chains): 1
  • 78% - 85% (Several small continents with many island chains): 1
  • 78% - 85% (Several small continents with several island chains): 1
  • 86% - 95% (One small continent with many island chains): 1
  • 86% - 95% (One small continent with several island chains): 1
  • 86% - 95% (Many large islands and archipelagos): 0
  • 86% - 95% (Some large islands and archipelagos): -1
  • 96% - 100% (No significant land masses): -2

5) Assign the appropriate points for the relevant level of Geologic Activity (volcanoes and tectonic activity):

  • None: 0
  • Light: 2
  • Moderate: 3
  • Heavy: 0
  • Extreme: -1

6) Assign 1 point for each indication of abundance of a particular resource:

  • Normal Metals: 85 or higher
  • Special Metals: 3 or higher
  • Radioactives: 6 or higher
  • Gem Stones: 6 or higher
  • Industrial Crystals: 3 or higher

7) 4) Assign the following points for the respective role and opportunities for aquaculture (water-based food):

  • 0% - 5% (Predominantly land covered): -1
  • 6% - 25% (One mega-continent with various small island chains): 0
  • 6% - 25% (Several large continents with a few small continents and island chains): 1
  • 26% - 77% (Several large continents with several small continents and island chains): 2
  • 26% - 77% (Several large continents with a few small continents and island chains): 1
  • 26% - 77% (One large continent with several small continents and island chains): 2
  • 26% - 77% (One large continent with a few small continents and island chains): 1
  • 26% - 77% (Many small continents with many island chains): 3
  • 26% - 77% (Many small continents with several island chains): 3
  • 78% - 85% (Several small continents with many island chains): 3
  • 78% - 85% (Several small continents with several island chains): 3
  • 86% - 95% (One small continent with many island chains): 2
  • 86% - 95% (One small continent with several island chains): 2
  • 86% - 95% (Many large islands and archipelagos): 3
  • 86% - 95% (Some large islands and archipelagos): 2
  • 96% - 100% (No significant land masses): 1

8) Total these points together for the Affinity Score.

9) Determine the Base Capacity based on the Civilization Scale Rating of the current population. If the planet is uninhabited, assume a Rating of 0:

Base Capacity Table
Rating Base Capacity
0 10,000
1 100,000
2 500,000
3 600,000
4 700,000
5 2.5 million
6 5 million
7 7.5 million
8 10 million
9 15 million
10 20 million
11 optional
If the Scale Rating is 11, then the GM decides as to what the actual Base (as well as Current) Population will be.


10) Find the assigned Affinity Modifier on this table:

Affinity Modifiers Table
Affinity Score Modifier
0 0.25
1 0.5
2 1
3 2
4 4
5 8
6 15
7 30
8 60
9 125
10 250
11 500
12 1,000
13 1,500

11) For the Diameter Modifier, divide the planet's diameter by 12,742 (Earth's own diameter) and square the result. (Ex: a planet with a diameter of 28,600 kms would have a Diameter Modifier of 5.02: 28,600 / 12,742 = 2.24 rounded; 2.242 = 5.02 rounded.) For Class Z (Asteroid Belt), the Diameter Modifier is 50, representing the breadth of choices for potential living surfaces.

12) To determine a planet's Base Population, multiply the Base Capacity by the Affinity and Diameter Modifiers.

Current Populations

The previous section determined the base population of a world, establishing the capacity of a world to be self-sustaining, existing on the world without over-consuming the present resources. However, as is evident, worlds don't naturally restrict the populations of their intelligent species and the capacity to sustain a species with the world alone is often overrun. As such, these determination rules do allow for over-population, which leads to potential problems to be solved, or tensions to run amuck--reducing the population with a problematic solution.

1) To determine the Current Population of a homeworld (i.e., the starting world of an independent species), multiply the Base Population by 10 and divide with the result of a roll of 2d6+3.

2) If a minor planet (of another species) is found during exploration of a sector, it is presumed to not have a population in excess of the planet's Base Population: multiply the Base Population by 10 and divide with the result of a roll of 1d6+3. Re-roll if the population exceeds the allowed Base Population.

Also roll 1d100 to determine at what level of economic development the planet exists:

  • 01-10: Major Industrial World (Minor Industrial World, if population less than 3 billion)
  • 11-70: Colony (Minor Industrial World, if population over 1 billion)
  • 71-00: Other (Colony, if population over 100,000)

Population Increase

Populations increase by 25.53% every 10 years (or 2.3% annually); therefore, presuming no catastrophes or other population-changing events occur within a given time period, increase the population by the given amount.

Planet Classes & relevant data

Class A (Orbits: yellow, green, blue)

  • Diameter: 1,000 to 3,200 kms (% of Earth)
  • Gravity: ((1d10+5)/10) * %E
  • Surface Area: 510,075,000 * G
  • Water Area: -
  • Rotation Period: 1d20 * 4 days
  • Atmospheric Density: trace
  • Climate: -
  • No. of Satellites: 0
  • Resources: -

Class B (Orbits: yellow)

  • Diameter: 1,000 to 3,200 kms (% of Earth)
  • Gravity: ((1d10+5)/10) * %E
  • Surface Area: 510,075,000 * G
  • Water Area: -
  • Rotation Period: 1d20 * 3 days
  • Atmospheric Density: 35% none, 65% trace
  • Climate: -
  • No. of Satellites: 0
  • Resources: -

Class C (Orbits: green, blue)

  • Diameter: 1,000 to 3,200 kms (% of Earth)
  • Gravity: ((1d10+5)/10) * %E
  • Surface Area: 510,075,000 * G
  • Water Area: -
  • Rotation Period: 1d30 days
  • Atmospheric Density: frozen
  • Climate: -
  • No. of Satellites: Table 7A
  • Resources: Table 8G(3)

Class D (Orbits: yellow, green, blue)

  • Diameter: 1,000 to 3,200 kms (% of Earth)
  • Gravity: ((1d10+5)/10) * %E
  • Surface Area: 510,075,000 * G
  • Water Area: -
  • Rotation Period: 1d30 days
  • Atmospheric Density: 65% none, 35% trace
  • Climate: -
  • No. of Satellites: Table 7A
  • Resources: Table 8G(2)

Class E (Orbits: yellow, green, blue)

  • Diameter: 3,200 to 10,000 kms (% of Earth)
  • Gravity: ((1d10+5)/10) * %E
  • Surface Area: 510,075,000 * G
  • Water Area: -
  • Rotation Period: (2d10+14) * 3 hours
  • Atmospheric Density: Table 8F
  • Climate: -
  • No. of Satellites: (1d6-3) (all Class D)
  • Resources: Table 8G(2)

Class F (Orbits: green)

  • Diameter: 3,200 to 10,000 kms (% of Earth)
  • Gravity: ((1d10+5)/10) * %E
  • Surface Area: 510,075,000 * G
  • Water Area: 1d20 (as %)
  • Rotation Period: (2d10+14) * 2 hours
  • Atmospheric Density: Table 8F
  • Climate: -
  • No. of Satellites: Table 7A
  • Resources: Table 8G(4)

Class G (Orbits: green)

  • Diameter: 3,200 to 10,000 kms (% of Earth)
  • Gravity: ((1d10+5)/10) * %E
  • Surface Area: 510,075,000 * G
  • Water Area: 1d60 + 20 (as %)
  • Rotation Period: (2d10+14) * 1.5 hours
  • Atmospheric Density: Table 8F
  • Climate: Table 8G
  • No. of Satellites: (1d6-3) (all Class D)
  • Resources: Table 8G(1)

Class H (Orbits: green)

  • Diameter: 3,200 to 10,000 kms (% of Earth)
  • Gravity: ((1d10+5)/10) * %E
  • Surface Area: 510,075,000 * G
  • Water Area: 1d20 (as %)
  • Rotation Period: 2d10+14 hours
  • Atmospheric Density: 65% thin, 35% standard
  • Climate: desert
  • No. of Satellites: (1d6-3) (all Class D)
  • Resources: Table 8G(1)

Class I (Orbits: blue)

  • Diameter: 10,500 to 55,000 kms (% of Earth)
  • Gravity: (gas planet formula)
  • Surface Area: -
  • Water Area: -
  • Rotation Period: 1d8 + 12 hours
  • Atmospheric Density: -
  • Climate: -
  • No. of Satellites: 0-8 (then Table 7b)
  • Resources: -

Class J (Orbits: green, blue)

  • Diameter: 55,000 to 900,000 kms (% of Earth)
  • Gravity: (gas planet formula)
  • Surface Area: -
  • Water Area: -
  • Rotation Period: 1d6 + 7 hours
  • Atmospheric Density: -
  • Climate: -
  • No. of Satellites: 3d6 (then Table 7b)
  • Resources: -

Class K (Orbits: green)

  • Diameter: 3,200 to 10,000 kms (% of Earth)
  • Gravity: ((1d10+5)/10) * %E
  • Surface Area: 510,075,000 * G
  • Water Area: 0
  • Rotation Period: 2d10+14 hours
  • Atmospheric Density: thin
  • Climate: -
  • No. of Satellites: (1d6-3) (all Class D)
  • Resources: Table 8G(1)

Class L (Orbits: green)

  • Diameter: 3,200 to 10,000 kms (% of Earth)
  • Gravity: ((1d10+5)/10) * %E
  • Surface Area: 510,075,000 * G
  • Water Area: 1d20 + 20 (as %)
  • Rotation Period: 2d10+14 hours
  • Atmospheric Density: Table 8F
  • Climate: 33% tropical, 34% temperate – warm, 33% temperate – cool
  • No. of Satellites: (1d6-3) (all Class D)
  • Resources: Table 8G(1)

Class M (Orbits: green)

  • Diameter: 3,200 to 10,000 kms (% of Earth)
  • Gravity: ((1d10+5)/10) * %E
  • Surface Area: 510,075,000 * G
  • Water Area: 1d60 + 20 (as %)
  • Rotation Period: 2d10+14 hours
  • Atmospheric Density: Table 8F
  • Climate: Table 8G
  • No. of Satellites: (1d6-3) (all Class D)
  • Resources: Table 8G(1)

Class N (Orbits: yellow, green)

  • Diameter: 3,200 to 10,000 kms (% of Earth)
  • Gravity: ((1d10+5)/10) * %E
  • Surface Area: 510,075,000 * G
  • Water Area: -
  • Rotation Period: 2d10+14 hours
  • Atmospheric Density: extremely thick
  • Climate: -
  • No. of Satellites: (1d6-3) (all Class D)
  • Resources: Table 8G(4)

Class O (Orbits: green)

  • Diameter: 3,200 to 10,000 kms (% of Earth)
  • Gravity: ((1d10+5)/10) * %E
  • Surface Area: 510,075,000 * G
  • Water Area: 1d20 + 80 (as %)
  • Rotation Period: 2d10+14 hours
  • Atmospheric Density: Table 8F
  • Climate: 33% tropical, 34% temperate – warm, 33% temperate – cool
  • No. of Satellites: (1d6-3) (all Class D)
  • Resources: Table 8G(1)

Class P (Orbits: green)

  • Diameter: 3,200 to 10,000 kms (% of Earth)
  • Gravity: ((1d10+5)/10) * %E
  • Surface Area: 510,075,000 * G
  • Water Area: 1d60 + 20 (as %)
  • Rotation Period: 2d10+14 hours
  • Atmospheric Density: Table 8F
  • Climate: arctic
  • No. of Satellites: (1d6-3) (all Class D)
  • Resources: Table 8G(1)

Class Q (Orbits: green)

  • Diameter: 3,200 to 10,000 kms (% of Earth)
  • Gravity: ((1d10+5)/10) * %E
  • Surface Area: 510,075,000 * G
  • Water Area: 1d60 + 20 (as %)
  • Rotation Period: 2d10+14 hours
  • Atmospheric Density: Table 8F
  • Climate: varies
  • No. of Satellites: (1d6-5) (all Class D)
  • Resources: Table 8G(1)
  • Note: no sentience rolls

Class S (Orbits: yellow, green, blue)

  • Diameter: 900,000 to 4,160,000 kms (% of Earth)
  • Gravity: (gas planet formula)
  • Surface Area: -
  • Water Area: -
  • Rotation Period: 1d6 + 5 hours
  • Atmospheric Density: -
  • Climate: -
  • No. of Satellites: 4d6 (then Table 7c)
  • Resources: -

Class T (Orbits: yellow, green, blue)

  • Diameter: 4,161,000 and 5,200,000 kms (% of Earth)
  • Gravity: (gas planet formula)
  • Surface Area: -
  • Water Area: -
  • Rotation Period: 1d6 + 3 hours
  • Atmospheric Density: -
  • Climate: -
  • No. of Satellites: 1d8 - 5 (then Table 7d)
  • Resources: -

Class Y (Orbits: green)

  • Diameter: 1,000 to 10,000 kms (% of Earth)
  • Gravity: ((1d10+5)/10) * %E
  • Surface Area: 510,075,000 * G
  • Water Area: -
  • Rotation Period: 1d6+14 hours
  • Atmospheric Density: 30% thick, 70% extremely thick
  • Climate: -
  • No. of Satellites: (1d6-3) (all Class D)
  • Resources: Table 8G(4)
  • Note: no sentience rolls

Class Z (Orbits: yellow, green, blue)

  • Diameter: -
  • Gravity: -
  • Surface Area: -
  • Water Area: -
  • Rotation Period: -
  • Atmospheric Density: -
  • Climate: -
  • No. of Satellites: -
  • Resources: Table 8G(2)


Notes:

  1. rework zone planet options (Table 4)
  2. rework Table 6 to reflect depicted satellite ranges per planet class
  3. confirm/correct Resources (Table 8G(1-4)) match the planet classes' current status

Alternate Method for Gravity, Diameter & Surface Area

Rocky planets

To determine diameter, gravity, and surface area for rocky (versus gas) planets:

Establish Density (Rocky)

Roll 3d6 on the appropriate table for each of the following planets:

  • Class A, C: Table A1
  • Classes B, D: Table A2
  • Classes E, F, G, H, K, L, M, N, O, P, Q, Y: Table A3

Table A1: Density

  • 03-06: 0.3
  • 07-10: 0.4
  • 11-14: 0.5
  • 15-17: 0.6
  • 18: 0.7

Table A2: Density

  • 03-06: 0.6
  • 07-10: 0.7
  • 11-14: 0.8
  • 15-17: 0.9
  • 18: 1.0

Table A3: Density

  • 03-06: 0.8
  • 07-10: 0.9
  • 11-14: 1.0
  • 15-17: 1.1
  • 18: 1.2

Establish Diameter (Rocky)

  • Class A, B, C, D: roll between 0.07 and 0.25 diameters
  • Classes E, F, G, H, K, L, M, N, O, P, Q, Y: roll between 0.26 and 1.51 diameters

Establish Gravity (Rocky)

Gravity is determined by the following formula: density * diameter, as measured in units of gravity (g).

Establish Surface Area

...as measured in units of surface area (a2).

Gas planets

To determine diameter, gravity, and surface area for gas planets:

Establish Density (Gas)

For gas giants, roll between 0.6 and 2.5 for density.

Establish Diameter (Gas)

  • Class I: roll between 1.6 and 8.5
  • Class J: roll between 8.6 and 140
  • Class S: roll between 141 and 652
  • Class T: roll between 653 and 816
  • Class U: roll between
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