Period-57 glider gun

Period-57 glider gun
x = 47, y = 40, rule = B3/S23 27b2o$27b2o9b2obo$39bob3o$35b2o2bo4bo$35b3obo3bobo$10b2o2bo20bo2bo3bo 2bo$3b2ob2o3b4o22bo4bobo$4bobo2bo30bobob2o$2b2o4b2ob2o23b2o5bo2bo$2bo 10bo25bobob4o$bo2bo2bob2o2bo22bob3o2bo$2b2o3b2ob4ob2o11bo7bo3bo2bob2o$ 4bo5b2obo2bo10b3o7bo3bo2bobo$4bob3o5bo11bo2b2o3bo2b3ob2obo$9bob3o11b3o b2o3bo2b3ob2ob2o$3bo3bo2b2o14b5o6bo8bo$5obobo2bo7bo8bo7bo3bo2b2obo$4bo bo3bo6b5o13bob2o2bo2b2o$4b2o2b3o2bo3b2ob3o14bobob2o$3bo4b3o2bo3b2o2bo 11b2o4bobo$3b2o5bo7b3o11bo5bo2bo$2bo4bo3bo7bo12bob2o2bobo$3bobob3obo 19b2obo4bo$8bo27bo$3o4bo2bo24b2o$8b2o$5b2o$5bo$2b2obobo$2o3bob3o3b2o$ 4bobo3bo2bo$o2bo2bo2bobobo$bo2bob2o2bo2bob2o$obobo6b2obo2bo$b2obo9bob 2o$3bo7b2obo$3bobo4bobobo$4b2o3bo2bobo2b2o9bo$8bo3bo3bo2bo9bo$9b2o6b2o 8b3o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ ZOOM 6 AUTOSTART OFF ]]
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Pattern type	Gun
Bounding box	47 × 40
Period	57
Barrels	1
Discovered by	Matthias Merzenich Elijah Ken David Raucci
Year of discovery	2025
Rules Outer-totalistic rules B3/S23 – B38/S23 # of rules 21 = 2 Isotropic rules B3/S23 – B38/S234c
Pattern files Plaintext trueperiod57gun1engine.cells RLE trueperiod57gun1engine.rle

A period-57 glider gun is any glider gun with period 57. The first such gun, Quetzal-57, was discovered by Matthias Merzenich on April 15, 2016. Since then, a variety of reductions have yielded much smaller period-57 guns, most of which, including the smallest known example shown in the infobox, have been constructed to incorporate a period-57 R-pentomino hassler found by David Raucci in 2021.

On February 5th, 2025, Merzenich found a gun variant using only a single engine based on a partial by Elijah Ken. Further reductions to the period-3 sparkers by iNoMed, vilc, and Merzenich reduced the bounding box of 50 × 46. In March 2025, Merzenich found an alternate period-3 catalysis that reduced the bounding box to 47 × 40.

See also

• Quetzal
• p57 Herschel loop 1