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SIM PlanetQuest Status (updated May 2008):

The Project is currently in Phase B (Preliminary Design). Launch deferred indefinitely by NASA headquarters. (JPL Project Life Cycle)

SIM Technology is Complete:

  • Ten-year technology program, including eight NASA HQ specified technology gates, are all complete, satisfying all NASA HQ technology requirements for SIM Implementation Phase (Phase C/D) entry.
  • Technology completion/readiness confirmed by multiple external independent reviews.

Recently Completed Milestone(s) and Events:

  • SIM Special Session, Winter AAS Meeting, January 9, 2008
      + View presentations
  • SIM Technical Advisory Committee March 13, 2007

Upcoming Meetings and Reviews:

  • SIM Science Team Meeting, Caltech, June 9-11, 2008
  • SIM Science Team Meeting, Edinburgh, Scotland, July 18-19, 2008
    (before Cool Stars)

SIM Science is Compelling and Uncompromised:

  • SIM represents an entirely new measurement capability in astronomy and a revolution in astrometry that will exceed all previous measurements by a factor of 100-1,000. For faint stars, SIM's capability will exceed that of upcoming missions such as Gaia by a factor of 25-75 or more.
  • SIM science program endorsed by two NRC Decadal committees (Bahcall-1991; McKee/Taylor 2001). Reaffirmed by CAA in 2002 and praised for its dual capability in astrophysics and planet finding. Astrometric performance exceeds, by more than a factor of 2, the objectives established by the NRC/CAA.
  • SIM Science Team & Key Projects selected by peer-review in 2000. These remain relevant today can only be accomplished by SIM-PlanetQuest.
    • Half of SIM observing time remains to be allocated via future solicitation/competition.
  • Importance in definitively measuring planet masses & orbits is not diminished by advances elsewhere. Modeling and inference are not substitutes for actually measuring the most fundamental property of any astronomical body: its mass.
    • SIM has the capability to detect large numbers of rocky planets around nearby stars.
    • In a survey of the best 120 candidate stars for hosting such planets in the 'habitable zone,' SIM would have the sensitivity to find planets smaller than Earth around six stars, planets smaller than two Earth masses around 24 stars, and planets smaller than ~ three Earth masses around every star in the survey group.
  • Kepler and SIM complement one another.
    • SIM studies nearby exoplanetary systems, while Kepler studies a large sample of distant stars to obtain a statistical sample of exoplanetary systems that are too distant for follow-up characterization.
  • GAIA and SIM complement one another.
    • SIM excels at studying bright and faint sources to high accuracy, while GAIA will obtain astrometric measurements of a large number of relatively bright stars.

The Project is currently prepared to complete the preliminary design and proceed into implementation when NASA funding becomes available.


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Extrasolar planets. Exo-planets. Searching for extrasolar planets. Searching for exo-planets. Earth-like planets in the Milky Way. Exoplanets and extra-solar planets, or exoplanets and extra-solar planets. Planets around others stars are called extrasolar planets. What is an extrasolar planet? Astronomy, or astronomy and finding planets. National Aeronautics and Space Administration Jet Propulsion Laboratory Website California Institute of Technology Website JPL Website Home Page JPL Website - Earth JPL Website - Solar System JPL Website - Stars and Galaxies JPL Website - Science and Technology Planet Quest Home Page Space Interferometry Mission Home Page SIM Astronomers' Site Planet Quest Home Page SIM PlanetQuest Astronomers' Site Home Page