Astrometric study of Gaia DR2 stars for interstellar communication

Naoki Seto, Kazumi Kashiyama

Research output: Contribution to journalReview articlepeer-review

2 Citations (Scopus)


We discuss the prospects of high precision pointing of our transmitter to habitable planets around Galactic main sequence stars. For an efficient signal delivery, the future sky positions of the host stars should be appropriately extrapolated with accuracy better than the beam opening angle Î&tild; of the transmitter. Using the latest data release (DR2) of Gaia, we estimate the accuracy of the extrapolations individually for 4.7 × 107 FGK stars, and find that the total number of targets could be ∼107 for the accuracy goal better than 1″. Considering the pairwise nature of communication, our study would be instructive also for SETI (Search for Extraterrestrial Intelligence), not only for sending signals outward.

Original languageEnglish
JournalInternational Journal of Astrobiology
Publication statusAccepted/In press - 2020
Externally publishedYes


  • astrobiology
  • Extraterrestrial intelligence

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Physics and Astronomy (miscellaneous)
  • Space and Planetary Science
  • Earth and Planetary Sciences (miscellaneous)


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