Cosmic Call

Cosmic Call was the name of two sets of interstellar radio messages that were sent from RT-70 in Yevpatoria, Ukraine in 1999 (Cosmic Call 1) and 2003 (Cosmic Call 2) to various nearby stars. The messages were designed with noise-resistant format and characters.[1]

RT-70 in Yevpatoria

The project was funded by Team Encounter,[2] a Texas-based startup, which went out of business in 2004.[3]

Both transmissions were at ~150 kW, 5.01 GHz (FSK +/-24 kHz).[4]

Message structure

Each Cosmic Call 1 session had the following structure. The Scientific Part (DDM, BM, AM, and ESM) was sent three times (at 100 bit/s),[5] and the Public Part (PP) was sent once (at 2000 bit/s),[5] according to the following arrangement:

DDM → BM → AM → ESM → DDM → BM → AM → ESM → DDM → BM → AM → ESM → PP,

where DDM is the Dutil-Dumas Message,[6][7] 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.[5]

Each Cosmic Call 2 session in 2003 had the following structure:

DDM2 → DDM2 → DDM2 → AM → AM → AM → BIG → BIG → BIG → BM → ESM → PP,

where DDM2 is modernized DDM (aka Interstellar Rosetta Stone, ISR), BIG is Bilingual Image Glossary.[4] All but the PP were transmitted at 400 bit/s[4]

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.[4]

Stars targeted

The messages were sent to the following stars:[8]

Name Designation HD Constellation Date sent Arrival date Message
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
GJ 49Hip 4872CassiopeiaJuly 6, 2003April 2036Cosmic Call 2
GJ 208HD 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

See also

References
  1. Oberhaus, Daniel (2019-09-27). Extraterrestrial Languages. MIT Press. pp. 99–104. ISBN 978-0-262-35527-8. OCLC 1142708941.
  2. Michael Chorost (September 26, 2016). "How a Couple of Guys Built the Most Ambitious Alien Outreach Project Ever, History of Cosmic Calls". Smithsonian.
  3. "Archived copy". Archived from the original on 2009-05-15. Retrieved 2009-03-02.{{cite web}}: CS1 maint: archived copy as title (link)
  4. Richard Braastad, Team Encounter, USA, Alexander Zaitsev, IRE RAS, Russia. "Synthesis and Transmission of Cosmic Call 2003 Interstellar Radio Message".{{cite web}}: CS1 maint: multiple names: authors list (link)}
  5. "Broadcast for Extra-Terrestrial Intelligence from Evpatoria Deep Space Center" Report on Cosmic Call 1999
  6. "Bitmap". Archived from the original on 2007-05-12. Retrieved 2021-09-22.
  7. "Image". Archived from the original on 2012-01-14. Retrieved 2021-09-22.
  8. Передача и поиски разумных сигналов во Вселенной
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