44P5H2V0

	44P5H2V0
	<a href="/wiki/File:44p5h2v0.png" class="image" title="44P5H2V0 image"><img alt="44P5H2V0 image" src="/w/images/2/2b/44p5h2v0.png" decoding="async" width="205" height="157" /></a>
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Pattern type	Spaceship
Number of cells	44
Bounding box	15×10
Direction	Orthogonal
Period	5
Mod	5
Speed	2c/5
Speed (unsimplified)	2c/5
Heat	47.2
Discovered by	Dean Hickerson
Year of discovery	1991
Rules
Outer-totalistic rules	B3/S23 – B38/S238
Important rules	Conway Life
# of rules	22 = 4
Isotropic rules	B3-ey/S2-n3-c – B34ety5aei6en7c8/S234ctz5acery6-k7e8
Glider synthesis
Fewest gliders	38 (17†)
Catagolue-generated RLE	44p5h2v0_synth.rle
	†Can be constructed with 17 gliders using the reverse caber tosser universal constructor.
Pattern files
Plaintext	44p5h2v0.cells
RLE	44p5h2v0.rle
Identifiers
apgcode	xq5_0sg3pnxnp3gsz4s01tve0evt10s4
Pentadecathlon ID	44P5H2V0.1
Eppstein ID	13491

44P5H2V0 is an unnamed 2c/5 orthogonal spaceship discovered by Dean Hickerson on July 23, 1991,^[1] being the first 2c/5 spaceship to be found. Robert Wainwright and David Bell then found some small tagalongs that allowed the creation of arbitrarily large 2c/5 spaceships. These were the only known 2c/5 spaceships until the discovery of 70P5H2V0 by Hartmut Holzwart on December 5, 1992.^[2]

Goldtiger997 found a 131-glider synthesis for 44P5H2V0 on August 29, 2020.^[3] Tanner Jacobi improved the synthesis to 41 gliders the same day,^[4] and iNoMed improved it to 39 in March 2021.^[5] ENORMOUS_NAME and iNoMed constructed a 44P5H2V0 gun on October 30, 2020.^[6]

Image gallery

Some tagalongs (in green) for 44P5H2V0 (first two found by Robert Wainwright, third found by David Bell)
Download RLE: click here

↑ David Bell's article, "Spaceships in Conway's Life (Part 6)"
↑ David Bell's article, "Spaceships in Conway's Life (Addendum 1)"
↑ Goldtiger997 (August 29, 2020). Re: Small Spaceship Syntheses (discussion thread) at the ConwayLife.com forums
↑ Tanner Jacobi (August 29, 2020). Message in #cgol on the Conwaylife Lounge Discord server
↑ iNoMed (March 28, 2021). Re: Small Spaceship Syntheses (discussion thread) at the ConwayLife.com forums
↑ ENORMOUS_NAME (October 30, 2020). Re: Gun Discussion Thread (discussion thread) at the ConwayLife.com forums