# Difference between revisions of "P15 pre-pulsar spaceship"

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− | The '''p15 pre-pulsar spaceship''' is a | + | The '''p15 pre-pulsar spaceship''' is a {{periodS|15}} [[c/5 orthogonal]] [[spaceship]] discovered by [[Noam Elkies]] in December {{year|1997}}.<ref>{{CiteSummersPattern|name=jslife}}</ref> It uses the sparks from two period {{periodS|5|brief}} spaceships to shift a pre-pulsar three [[cell]]s in fifteen [[generation]]s. The original form of this ship used a much larger spaceship found by [[Tim Coe]], while the form shown at right uses a spaceship found by [[Paul Tooke]]. In the following year [[David Bell]] found the similar [[pre-pulsar spaceship|p30 pre-pulsar spaceship]]. |

==Image gallery== | ==Image gallery== |

## Latest revision as of 02:11, 28 December 2019

p15 pre-pulsar spaceship | |||||||||||

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Pattern type | Spaceship | ||||||||||
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Number of cells | 494 | ||||||||||

Bounding box | 61×47 | ||||||||||

Direction | Orthogonal | ||||||||||

Period | 15 | ||||||||||

Mod | 15 | ||||||||||

Speed | c/5 | ||||||||||

Speed (unsimplified) | 3c/15 | ||||||||||

Heat | 496.3 | ||||||||||

Discovered by | Noam Elkies | ||||||||||

Year of discovery | 1997 | ||||||||||

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The **p15 pre-pulsar spaceship** is a period-15 c/5 orthogonal spaceship discovered by Noam Elkies in December 1997.^{[1]} It uses the sparks from two period 5 spaceships to shift a pre-pulsar three cells in fifteen generations. The original form of this ship used a much larger spaceship found by Tim Coe, while the form shown at right uses a spaceship found by Paul Tooke. In the following year David Bell found the similar p30 pre-pulsar spaceship.

## Image gallery

## See also

## References

## External links

Categories:

- Patterns
- Patterns with 494 cells
- Patterns found by Noam Elkies
- Patterns found in 1997
- Spaceships
- Periodic objects with minimum population 494
- Spaceships with period 15
- Orthogonal spaceships
- Spaceships with speed c/5
- Spaceships with unsimplified speed 3c/15
- Spaceships with heat 496
- Spaceships with mod 15
- Patterns with bilateral orthogonal symmetry