p61 Herschel loop 2
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p61 Herschel loop 2  
View static image  
Pattern type  Oscillator  

Number of cells  1596  
Bounding box  381×70  
Period  61  
Mod  61  
Heat  762.3  
Volatility  0.92  
Strict volatility  0.92  
Discovered by  Paul Callahan  
Year of discovery  1997  
 

P61 Herschel loop 2 is a period 61 Herschel loop oscillator found by Paul Callahan in February 1997, improving on Dave Buckingham's P61 Herschel loop 1 from his article My Experience with Bheptominos in Oscillators. It was the smallest oscillator of this period until the discovery of the Snark.
The original version was functionally equivalent but slightly larger than the pattern shown, due to its use of eater 2s instead of eater 5s to suppress each Herschel's first natural output glider, quickly enough to allow the next Herschel to follow 61 ticks later.
Categories:
 Patterns
 Patterns with 1000 or more cells
 Oscillators with 1000 or more cells
 Patterns found by Paul Callahan
 Patterns found in 1997
 Oscillators
 Periodic objects with minimum population 1596
 Oscillators with period 61
 Oscillators with mod 61
 Oscillators with heat 762
 Oscillators with volatility 0.92
 Oscillators with strict volatility 0.92
 Patterns with 180degree rotation symmetry