Cosmic Call


Cosmic Call was the name of two sets of interstellar radio messages that were sent from RT-70 in Yevpatoria, Crimea in 1999 and 2003 to various nearby stars. The messages were designed with noise-resistant format and characters.
The project was funded by Team Encounter, Charlie Chafer a Texas-based startup, which went out of business in 2004.
Both transmissions were at ~150 kW, 5.01 GHz.

Message structure

Each Cosmic Call 1 session had the following structure. The Scientific Part was sent three times, and the Public Part was sent once, according to the following arrangement:
where DDM is the , created by Canadian scientists Yvan Dutil and Stéphane Dumas, BM is the Braastad Message, AM is the Arecibo Message, and ESM is the Encounter 2001 Staff Message.
Each Cosmic Call 2 session in 2003 had the following structure:
where DDM2 is modernized DDM, BIG is Bilingual Image Glossary. All but the PP were transmitted at 400 bit/s
The ISR was 263,906 bits; BM, 88,687 bits, AM, 1,679 bits; BIG was 12 binary images 121,301 bits; ESM 24,899 bits. Total = 500,472 bits for 53 minutes. PP was 220 megabytes and sent at a rate of 100,000 bit/s for 11 hours total.

Stars targeted

The messages were sent to the following stars:
NameDesignation HDConstellationDate sentArrival dateMessage
16 Cyg AHD 186408CygnusMay 24, 1999November 2069Cosmic Call 1
15 SgeHD 190406SagittaJune 30, 1999February 2057Cosmic Call 1
HD 178428SagittaJune 30, 1999October 2067Cosmic Call 1
Gl 777HD 190360CygnusJuly 1, 1999April 2051Cosmic Call 1
Hip 4872CassiopeiaJuly 6, 2003April 2036Cosmic Call 2
HD 245409OrionJuly 6, 2003August 2040Cosmic Call 2
55 CncHD 75732CancerJuly 6, 2003May 2044Cosmic Call 2
HD 10307AndromedaJuly 6, 2003September 2044Cosmic Call 2
47 UMaHD 95128Ursa MajorJuly 6, 2003May 2049Cosmic Call 2