This is a list of known period-10 sparkers .
Several were found with dr , which doesn't care about the period, and you get whatever you get.
x = 21, y = 9, rule = B3/S23
3b2o11b2o$b3ob2ob2ob2ob2ob3o$o8bobo8bo$b5obobobobob5o$6b2obobob2o$3b2o
5bo5b2o$3bo13bo$4bo11bo$3b2o11b2o!
#C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]]
#C [[ GPS 5 THUMBSIZE 2 ]]
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55P10 . By far the most useful dot sparker. It is a double middleweight sparker. It can be reduced by two rows (height 8 instead of 10) if bounding box is a concern, or the two halves can be skewed by two cells if clearance is a concern(click above to open LifeViewer ) RLE : here Plaintext : here
x = 34, y = 17, rule = B3/S23
16b2o2$13bo6bo$12bo8bo$13b8o3$8b2o14b2o$2b2o4b6o6b6o4b2o$2b3o5b5o4b5o
5b3o$b2o2b2o2bo3bobo2bobo3bo2b2o2b2o$o2b2obob3obo2b4o2bob3obob2o2bo$2o
bo2bobo2bobo6bobo2bobo2bob2o$3bob2ob2obob8obob2ob2obo$3bo2bo2bobo10bob
o2bo2bo$4bobo2bobob4o2b2obobo2bobo$5bo4b2obo2bo2b2ob2o4bo!
#C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]]
#C [[ GPS 5 THUMBSIZE 2 ]]
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p10 domino fountain . By far the most useful domino sparker. It has extremely good clearance and decent fallback, although the oscillator itself is much larger than 55P10(click above to open LifeViewer ) RLE : here Plaintext : here
x = 16, y = 13, rule = B3/S23
11b2ob2o$7bobo2bobo$9bo2bobo$4bo5bob2o$4bo3b3o$11b3o$3bobob2obo2bo$b3o
bobo3b2o$o4b2o2b2o$b4o5bo$4bo4bo$3bo5b2o$3b2o!
#C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]]
#C [[ GPS 5 THUMBSIZE 2 ]]
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p10 filter, named because it can double the period of a period 10 N + 5 stream, deleting every second glider. This is not its only use(click above to open LifeViewer ) RLE : here Plaintext : here
x = 14, y = 12, rule = B3/S23
2b2o$2bo$3b4obo$5b2o2bo$b4o$o4b2o$b3o2bobobo$3b2o3bob3o$7b2o4bo$8bob3o
$8bobo$9bo!
#C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]]
#C [[ GPS 5 THUMBSIZE 2 ]]
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p10 duoplet sparker(click above to open LifeViewer ) RLE : here Plaintext : here
x = 19, y = 19, rule = B3/S23
11bo$11bobo$10bobo$12bo2$10bo6bo$6b2obobo3b2o$6b2o2bobo4b2o$11bobo2bo$
12bo$bo4b2o$bobo2bobo2b2o$obo4b2o2b2o$2bo2$7bo$5b2o$7b2o$6bo!
#C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]]
#C [[ GPS 5 THUMBSIZE 2 ]]
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46P10 , used as a corner dot sparker(click above to open LifeViewer ) RLE : here Plaintext : here
#O Matthias Merzenich, November 12, 2010
#C The smallest known non-trivial period-10 oscillator.
x = 13, y = 9, rule = B3/S23
7b2o4b$7bo2bo2b$3bo4bo3bo$4b2o3bob2o2$2obo3b2o4b$o3bo4bo3b$2bo2bo7b$4b
2o!
#C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]]
#C [[ GPS 5 THUMBSIZE 2 ]]
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24P10 . Only useful in LCM oscillators. See 24P10 on 30P25 for the correct spot to use for interaction(click above to open LifeViewer ) RLE : here Plaintext : here
x = 15, y = 12, rule = B3/S23
2b2o3bo3b2o$2bobo5bobo$obo9bobo$2obo7bob2o$3bob2ob2obo$2obobo3bobob2o$
o2bob5obo2bo$2bo9bo$3b9o2$5b2ob2o$5b2ob2o!
#C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]]
#C [[ GPS 5 THUMBSIZE 2 ]]
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p10 lone dot sparker, found by Matthias Merzenich on February 19, 2022 . Much less clearance than 55P10, but the lack of side sparks could allow it to work in a situation that 55P10 doesn't. No uses have been found yet, though(click above to open LifeViewer ) RLE : here Plaintext : here
x = 40, y = 31, rule = B3/S23
12bo7bo6bo$11bobo8bo3bobo$b2o4b3obo5bo4bo5bob3o4b2o$bo2bo10b2o6b2o10bo
2bo$2b4o4b2o3b2o6b2o3b2o4b4o$5bobob3o5bo4bo5b3obobo$2b5obo8bo13bob5o$
2bo3bo4b2o6bo7b2o4bo3bo$5b2obob3o14b3obob2o$5bobobobo16bobobobo$6bo2bo
20bo2bo$2o7b2o18b2o7b2o$o2bobo2b2o20b2o2bobo2bo$b2ob2o3bo20bo3b2ob2o$
2bo3b2o24b2o3bo$o2b4o26b4o2bo$2obo3bobo20bobo3bob2o$bobo2b2o24b2o2bobo
$o2b2ob2o24b2ob2o2bo$obo2bo3bo20bo3bo2bobo$bobob4obo18bob4obobo$3bo6bo
18bo6bo$3bo3b2ob2o16b2ob2o3bo$b2ob2obobo20bobob2ob2o$2bobo2bobo20bobo
2bobo$2bo4bob2o18b2obo4bo$obo2bo2bo2bo16bo2bo2bo2bobo$2ob2ob2o2b2o16b
2o2b2ob2ob2o$3bobo28bobo$3bobo28bobo$4bo30bo!
#C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]]
#C [[ GPS 5 THUMBSIZE 2 ]]
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p10 sandwich hassler and half-middleweight sparker(click above to open LifeViewer ) RLE : here Plaintext : here
x = 17, y = 15, rule = B3/S23
3b2o7b2o$2bo2bo5bo2bo$2bob2o5b2obo$b2o11b2o$3b3o5b3o$b2o3bo3bo3b2o$obo
3bo3bo3bobo$o15bo$7bobo$bo5bobo5bo$4bo2bobo2bo$4b3o3b3o$7b3o$6bo3bo$6b
2ob2o!
#C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]]
#C [[ GPS 5 THUMBSIZE 2 ]]
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p10 corner dot sparker found by Open Science Grid (click above to open LifeViewer )
See also