astrometry articles
What is the single greatest adversary to high astrometric precision for ground-based telescopes?
What becomes the primary limitation on astrometric precision when telescopes escape Earth's atmosphere?
How is the error in proper motion measurement related to the total observation span?
Which objects form the foundation of the International Celestial Reference Frame (ICRF)?
How do distance errors grow as the target star moves farther away when using parallax?
Which techniques are used to mitigate distortions caused by atmospheric turbulence ('seeing')?
What systematic error is created by a slow, steady warping of the primary mirror cell over a mission?
Since astrometry is inherently relative, what determines the accuracy of any single measurement?
What technique defines the International Celestial Reference Frame (ICRF) and introduces inherent uncertainties?
What challenge arises if a star exhibits significant proper motion during the parallax baseline observation period?
What level of accuracy is required for measuring stellar locations in astrometry?
What unique planetary property does astrometry determine that radial velocity only estimates as minimum mass?
Which stars were involved in historical astrometric claims later deemed unproven or doubted?
When is the displacement measured by astrometry maximized for easier detection?
How many candidates were reported detected via astrometry compared to the confirmed count of pure discoveries?
Which specific astrometric discovery around 2020 failed subsequent radial-velocity checks, labeled a false positive?
How many exoplanets does the Gaia mission forecast detecting via astrometric wobble within 1,600 light-years?
What is the precision targeted by the Gaia mission for its brightest stars based on cumulative data?
How does astrometry's sensitivity to detection change relative to the planet's orbital distance from its star?
What essential measurement does astrometry rely upon in the context of planet hunting?
What fundamental property does astrometry chart across the sky to detect exoplanets?
What angular unit represents the apparent size of a US dime held on the Moon when viewed from Earth?
What is the primary scientific benefit of using astrometry over transit or radial velocity methods?
Which technology defines the modern era of high-precision astrometry by avoiding atmospheric distortion?
Why is astrometry uniquely suited for detecting planets orbiting at large distances from their host stars?
What stellar phenomenon causes the photocenter to shift, mimicking a planetary signal in astrometry?
What is the typical required waiting time to confidently confirm an Earth-like planet in a habitable zone orbit using astrometry?
Where is the barycenter of a star-planet system generally located due to the star's dominance in mass?
What are the reference objects used by Gaia to establish an effectively motionless celestial sphere for measurements?