Unnamed tagalong 23P4H2V0

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Unnamed tagalong 23P4H2V0
x = 10, y = 15, rule = B3/S23 9bo$7b3o$5b2o$5bo2b2o$5bo3bo$6b2o$7b2o$5b2o$5bo2b2o$5b3o2$bo2bo$o$o3bo $4o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ ZOOM 16 TRACKLOOP 4 -1/2 0 THUMBSIZE 2 GPS 2 HEIGHT 400 ]]
Pattern type Tagalong
Spaceship
Number of cells 32
Bounding box 12 × 16
Direction Orthogonal
Period 4 (mod: 4)
Speed c/2 | 2c/4
Heat 28.5
Kinetic symmetry n
Discovered by Hartmut Holzwart
Year of discovery 2020

This small, unnamed tagalong was discovered on the 8th of December 2020 by Hartmut Holzwart.[1] It can be attached to any XWSS. The version to the right is this tagalong attached to a lightweight spaceship, resulting in a spaceship with a minimum population of 32. It can also be attached to a heavyweight spaceship in the same manner, as well as to a middleweight spaceship in two different ways, or to itself. One standard spaceship can support two of these tagalongs.

The 32-cell version supported by a lightweight spaceship was the smallest known spaceship with no known glider synthesis[2][3] until Entity Valkyrie found a recipe for it on February 1, 2025.[4] The "MWSS top" variant is currently among the smallest remaining spaceships with no known synthesis.

Image Cells Supporting spaceship
apgcode
Synth.
cost
23p4h2v0tagalongonlwss.png 32 LWSS
xq4_17ojhc6ojszy79ghu
39
23p4h2v0tagalongonmwssback.png 34 MWSS back
xq4_ra24sz8ajlszy1aghgis
41
23p4h2v0tagalongonmwsstop.png 34 MWSS top
xq4_g808wsjo6chjo71zf8841
No synthesis known
23p4h2v0tagalongonhwss.png 36 HWSS
xq4_ra24sz8ajlszy1aghhgis
41


References

  1. Hartmut Holzwart (December 8, 2020). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
  2. Matthias Merzenich (January 25, 2021). Re: Small Spaceship Syntheses (discussion thread) at the ConwayLife.com forums
  3. Connor Steppie (December 11, 2022). Re: Small Spaceship Syntheses (discussion thread) at the ConwayLife.com forums
  4. Entity Valkyrie (February 1, 2025). Re: Small Spaceship Syntheses (discussion thread) at the ConwayLife.com forums