Unnamed tagalong 23P4H2V0

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 ]]
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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	Unspecified
Discovered by	Hartmut Holzwart
Year of discovery	2020
Rules Outer-totalistic rules B3/S23 – B38/S2378 # of rules 23 = 8 Isotropic rules B3-cr/S23-cy – B2n34ejrt5ce6cn7e8/S234ce5-cjny6-kn78
Pattern files RLE 23p4h2v0tagalongonlwss.rle
Identifiers apgcode xq4_17ojhc6ojszy79ghu

This small, unnamed tagalong was discovered on the 8th of December 2020 by Hartmut Holzwart. It can be attached to any standard spaceship. 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. One standard spaceship can support two of these tagalongs.

This tagalong is not currently known to be synthesizable via gliders, making it notable due to the 32-cell lightweight spaceship being the smallest known spaceship with no known glider synthesis as of June 2023. Indeed, none of the three higher order variants are synthesizable either, making them also among the smallest.

Image	Cells	Supporting spaceship apgcode	Synth. cost
	32	LWSS xq4_17ojhc6ojszy79ghu	No synthesis known
	34	MWSS back xq4_ra24sz8ajlszy1aghgis	No synthesis known
	34	MWSS top xq4_g808wsjo6chjo71zf8841	No synthesis known
	36	HWSS xq4_ra24sz8ajlszy1aghhgis	No synthesis known