Period 5 oscillators

Smallest

All known period five oscillators that have one phase of less than 29 on cells

Rank	Signature	Name	Image	Rotor Size	Volatility
1	015-17-17-25-17	pseudo-barberpole		28	.82
2	016-24-16-24-24	octagon 2		32	.80
3	017-20-19-21-19	silver's p5		19	.63
4	018-22-18-22-22	fumarole		26	.72
5	020-20-22-22-28	pentoad		22	.64
6	020-21-22-26-21	elkies' p5		16	.55
7	021-21-22-22-24	hooks		11	.39
8	023-24-29-27-33	pentoad 1H2		38	.79
9	026-26-30-30-40	pentoad with two hexominoes		38	.76
10	026-28-26-28-28	heart		18	.50
11	026-28-36-32-38	pentoad 2		54	.87
12	028-28-29-29-32	pentant		10	.28
13	028-30-44-34-34	scot's p5		62	.93
14	028-32-32-48-32	nivasch's pseudo-barberpole		52	.81
15	028-35-31-32-33	5blink		42	.76

Signatures are the population counts for the oscillator, sequenced so that the lowest numbers appear to the left. The first signature number has three digits to facilitate sorting when a table includes larger oscillators. Signature numbers are used to break ties in oscillators of nearly the same size.

Highest volatility

All known period five oscillators with volatility of at least 0.8

Rank	Name	Image	Rotor Size	Volatility
1	Statorless p5		156	1
2	Four-fold variant of Scot's p5		292	0.973
3	Swine		86	0.959
4	Scot's p5		28	0.939
5	Highly volatile p5 1		244	0.8714
6	Pentoad 2		26	0.871
7	Pseudo-barberpole		15	0.824
8	Voldiag		100	0.821
9	Nivasch's Pseudo-barberpole		28	0.813
10	Eppstein p5		42	0.802
11	Octagon 2		16	0.800

For purposes of this table, an extensable oscillator is only represented in its minimal form. This allows for one iteration of the inserted piece, as in swine and pentoad 2. Without this restriction oscillators with volatility arbitrarily close to 1 can be constructed by extending Pentoad or Electric fence.