Talk:Surveys

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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		 Red Yellow Green Blue Outer
Boundary
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

Yellow Zone
Roll 1d100 Planet
Class
01 - 07 A
08 - 14 B
15 - 21 C
22 - 28 D
29 - 40 E
41 - 46 J
47 - 49 K
50 - 82 N
83 - 85 Y
86 - 00 Z
Green Zone
Roll 1d100 Planet
Class
01 - 03 A
04 - 06 B
07 - 09 C
10 - 24 D
25 E
26 - 27 F
28 - 30 G
31 - 35 H
36 - 43 I
44 - 50 J
51 - 60 K
61 - 65 L
66 - 77 M
78 - 82 O
83 - 87 P
88 - 91 Q
92 - 93 S
94 T
95 - 00 Z
Blue Zone
Roll 1d100 Planet
Class
01 - 02 A
03 - 05 B
06 - 11 C
12 - 39 D
40 E
41 - 42 F
43 - 45 G
46 - 58 I
59 - 66 J
67 - 71 K
72 - 76 L
77 - 79 N
80 - 85 P
86 - 91 S
92 - 94 T
95 - 00 Z


Determining Orbital Durations (Years)

1. Determine base mass:

Stellar Mass
Star Types Solar Masses
D (White dwarf) 0.36
B (Blue-white) 4.4
A (White) 2.1
F (Yellow-white) 1.3
G (Yellow) 0.94
K (Orange) 0.57
M (Red) 0.331


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 Temperatures by Zone

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

  • Class H (Desert):
    • Polar: 5d12-5
    • Temperate: 40+5d8
    • Tropical: 60+5d10
    • Equatorial: 85+5d10
  • Class K (Adaptable):
    • Polar: 4d20-135
    • Temperate: 5d12-130
    • Tropical: 5d8-85
    • Equatorial: 5d10-65
  • Classes L (Marginal) & M (Terrestrial):
    • Polar: 4d20-10
    • Temperate: 5d12-5
    • Tropical: 40+5d8
    • Equatorial: 60+5d10
  • Classes O (Pelagic):
    • Polar: (4d20-10)+15%
    • Temperate: (5d12-5)+15%
    • Tropical: (40+5d8)+15%
    • Equatorial: (60+5d10)+15%
  • Class P (Glaciated):
    • Polar: 4d20-100
    • Temperate: 4d20-65
    • Tropical: 4d20-40
    • Equatorial: 4d20-10

2) Roll low temperatures for each of the following zones:

  • Class H (Desert):
    • Polar: 5d12-10-2d4
    • Temperate: 35+5d8-2d4
    • Tropical: 60+5d8-2d4
    • Equatorial: 85+5d8-2d4
  • Class K (Adaptable):
    • Polar: 4d20-2d4-145
    • Temperate: 5d12-2d4-135
    • Tropical: 5d8-2d4-85
    • Equatorial: 5d8-2d4-60
  • Classes L (Marginal) & M (Terrestrial):
    • Polar: 4d20-20-2d4
    • Temperate: 5d12-10-2d4
    • Tropical: 35+5d8-2d4
    • Equatorial: 60+5d8-2d4
  • Classes O (Pelagic):
    • Polar: (4d20-20-2d4)+15%
    • Temperate: (5d12-10-2d4)+15%
    • Tropical: (35+5d8-2d4)+15%
    • Equatorial: (60+5d8-2d4)+15%
  • Class P (Glaciated):
    • Polar: 4d20-80-4d8
    • Temperate: 4d20-40-4d8
    • Tropical: 4d20-20-4d4
    • Equatorial: 4d20-20-2d4

Determine Landmasses and Bodies of Water

If water = 100%, only "small incidental islands" exist.

If water makes up 50-99% of the planet's surface, use the following formula and then check the table for the results:

((water%/10) x 3) + 1d6, rounded
Water-rich worlds
Result Major
Continents		 Minor
Continents		 Major Islands Archipelagoes
16 2d6+1 1d6-1 3d6-3 2d6
17 2d6+1 2d6-2 3d6-3 2d6
18 2d6+1 3d6-3 3d6-3 2d6
19 2d6 1d6-1 3d6-3 2d6
20 2d6 2d6-2 3d6-3 2d6
21 2d6 3d6-3 3d6-3 2d6
22 1d6 1d6-1 3d6-3 2d6
23 1d6 2d6-2 3d6-3 2d6
24 1d6 3d6-3 3d6-3 2d6
25 1d6-1 1d6 3d6-3 2d6
26 1d6-1 2d6 3d6-3 2d6
27 1d6-1 3d6 3d6-3 2d6
28 1d6-2 1d6-1 3d6-3 2d6
29 1d6-3 1d6-2 3d6-3 2d6
30 1d6-4 1d6-3 2d6 2d6
31 0 0 1d6-3 2d6
32 0 0 0 Only archipelagoes
33 0 0 0 Only archipelagoes
34 0 0 0 Only archipelagoes
35 0 0 0 small incidental islands
36 0 0 0 small incidental islands

If water makes up 1-49% of the planet's surface, use the following formula and then check the table for the results:

((water%/10) x 3) + 1d6, rounded
Water-poor worlds
Result Major
Oceans		 Minor
Oceans		 Small
Seas		 Scattered
Lakes
1 0 0 0 small incidental lakes
2 0 0 0 small incidental lakes
3 0 0 0 scattered lakes
4 0 0 0 scattered lakes
5 0 0 1d6-3 2d6
6 0 0 2d6-3
7 1d6-4 1d6-3 3d6-3 2d6
8 1d6-4 1d6-3 3d6-3 2d6
9 1d6-3 1d6-2 3d6-3 2d6
10 1d6-3 1d6-1 3d6-3
11 1d6-2 1d6-1 3d6-3
12 1d6-2 2d6-2 3d6-3
13 1d6-1 1d6-1 3d6-3
14 1d6-1 2d6-2 3d6-3
15 1d6-1 3d6-3 3d6-3
16 1d6 2d6-2 3d6-3
17 1d6 3d6-3 3d6-3
18 1d6 1d6-1 3d6-3
19 1 1d6-1 3d6-3
20 1 2d6-2 3d6-3
21 1 3d6-3 3d6-3

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 8H(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 8H(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 8H(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 8H(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 8H(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 8H(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 8H(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 8H(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 8H(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 8H(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 8H(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 8H(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 8H(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 8H(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 8H(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 8H(1-4)) match the planet classes' current status
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