Siblings for SETI

David Frisch, Fulvio Melia

Research output: Contribution to journalArticlepeer-review


We on Earth and intelligent beings elsewhere in our galaxy can single out each other as special targets for communication if our stars have common properties, and can thus perhaps be stimulated to broadcast and listen directionally to try to give the coincidence between sending and listening that is necessary. The SAO Catalogue of roughly 260,000 stars was culled for such "sibling" candidates using their spectra, location, and motion. Only a few of the roughly 50,000 tabulated G-stars proved interesting, in part because the information about almost all of them is imprecise, and in part perhaps because our criteria were overselective. However, a set of mostly untabulated sibling candidate stars can be defined, given a direction and small solid angle that are mutually interesting to members of that set, so that overlapping broadcast/receiving cones can be selected on the basis of this commonality. We believe that the double cone about the direction to the galactic center, with half angle α = e2/ h {combining short stroke overlay}c = 1 137 radian, is an almost inevitable choice. With current technology, sending as well as receiving within this small solid angle can reach to about 1 kpsc, making available an estimated 103 G-star sibling candidates.

Original languageEnglish (US)
Pages (from-to)432-438
Number of pages7
Issue number3
StatePublished - Sep 1983

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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