Forms in `yaml`

ashtanga-logo.svg

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GURPS Space - 3rd Edition.md

Random Star Location

Assuming three-dimensional grid points one parsec apart, and a general separation between stars of about 4 parsecs, the GM may roll 2d to determine what lies at each grid point. Add 1 to the roll in a cluster or core area. 2-9 – Empty space. 10 – Possible unusual item; roll one die. If the result is a 6, go to the Unusual Stellar Objects table (p. 149). Otherwise, there is nothing here. 11+ – Star system. Note that this is a very time-consuming method of building a star map, unless you program a computer to do it for you. See p. 148 for an alternate method of placing worlds

Generating Star Systems

Single or Multiple?

As many as one in three star systems may be a multiple star. Roll 2d to deter- mine how many stars there are in the sys- tem, adding 2 to the roll if the area is in a cluster or galactic core: 2-9 – Single star. 10 – Double star. 11 – Triple star. 12+ – Four or more stars – a double rotating around a double or triple, for instance – GM’s decision!

Star Class (Size)

Stars fall into four size classes: main- sequence stars (average-sized stars like our own sun, and the most common), smaller dwarfs and subdwarfs, larger giants, and huge supergiants. Roll 3d: 3-5 – White dwarf (Class D). 6 – Subdwarf star (Class VI). 7-17 – Main-sequence star (Class V). 18 – Giant star; roll 3d again: 3 – Class I supergiant. 1 in 3 chance of Class Ia (the largest); 2 in 3 chance of Class Ib. 4 – Class II large giant. 5-12 – Class III giant. 13-18 – Class IV subgiant.

Main-Sequence Star Types

To determine type of a main-sequence star (Class V), roll 3d: 3 – O (Blue). 4 – B (Blue-white). 5 – A (White). 6 – F (Yellow-white). 7 – G (Yellow). 8 – K (Orange). 9-18 – M (Red). Clearly, the small, M-type red stars are by far the most common.

Giant Star Types

To determine the type of a giant, sub- giant, or supergiant star, roll 2d: 2 – O (Blue). 3 – M (Red). 4, 5 – B (Blue-white). 6-9 – K (Orange). 10-12 – A (White). Certain giant stars do not seem to exist. Ignore and re-roll the following results: O- II, O-III, O-IV and M-IV. Also ignore any Blue or Blue-white result if you are mapping an area of space other than a spiral arm or young cluster. Giant stars of types F and G are very unusual – they exist, but they are much too rare to show on a random table.

Subdwarf Star Types

Roll 1d for a subdwarf’s color: 1 – G (Yellow). 2 – K (Orange). 3-6 – M (Red)

Unusual Stellar Objects

To generate a random “unusual object” in interstellar space, roll 3d. Supernovae, huge black holes, zones of improbability (p. 164), and white holes are too uncom- mon to appear randomly on a three-die table; the GM must place these unique objects intentionally if he wants them to exist. 3 – Neutron star. 4 – Black dwarf (no planets). 5 – X-ray star. 6, 7 – Brown dwarf, with planet-size moon(s). 8, 9 – Lost planet (gas giant). 10-13 – Lost planet (terrestrial). 14 – Flare star (red M-type). 15 – SS Cygni catastrophic vari- able; roll 2d for number of months between bursts. 16 – Center of nova shell. 17 – Center of small dark nebula; roll 1d for diameter in parsecs. 18 – Roll on Very Unusual Stellar Objects table (below).

Very Unusual Stellar Objects

3 – Antimatter system. 4 – Planetary nebula; diameter 1d × 0.1 pc. 5 – Pulsar. 6 – Center of dark nebula with T Tauri protostars condensing; roll 1d for diameter of nebula in parsecs, 1d for number of protostars. 7 – Black dwarf, with planets. 8 – Center of large dark nebula; roll 3d for diameter in parsecs. 9, 10 – Black hole of average stellar mass. 11 – Nova. 12 – Black hole of 10 times average stellar mass. 13 – X-ray burster. 14,15 – Natural wormhole to some- where. 16 – Star enclosed by Dyson sphere (p. 162). Star will be type F through M. 17 – Center of huge dark nebula; roll 6d for diameter in parsecs. 18 – Neutron star/pulsar surrounded by supernova remnant.

systems timestamp spheric coordinates.yml

form:
  file: systems.csv
  timestamp: true
  fields:
    r:
      title: Radial distance
      type: roll
      description: Parsecs `[0-9]`
      roll: 1d10
      mod: -1
      disabled: true
    r_h:
      title: Decimal part
      description: Hundredth of Parsec `[0-99]`
      type: roll
      roll: 1d100
      mod: -1
      disabled: true
    t:
      title: Zenith angle
      description: From positive polar axis `[0-359]`
      type: roll
      roll: 1d360
      mod: -1
      disabled: true
    p:
      title: Azimuthal angle
      description: From meridian plane `[0-359]`
      type: roll
      roll: 1d360
      mod: -1
      disabled: true