Measuring proper motions of galactic dwarf galaxies with Hubble Space Telescope

S. Piatek, C. Pryor

Research output: Contribution to journalArticlepeer-review


Over the past several years, our research group has been measuring proper motions for nearby dwarf satellite galaxies using data taken with the Hubble Space Telescope. In order to measure proper motions with an expected size of several tens of milliarcseconds per century using a time baseline of 2-4 years, our work required that positions of stars and QSOs be measured to an accuracy of ~0.25 mas (~0.005 pixel). This contribution reviews the scientific justification of this work and our methodology. It concludes with a few general results and future directions.

Original languageEnglish (US)
Pages (from-to)244-247
Number of pages4
JournalProceedings of the International Astronomical Union
Issue numberS248
StatePublished - Oct 2007

All Science Journal Classification (ASJC) codes

  • Medicine (miscellaneous)
  • Astronomy and Astrophysics
  • Nutrition and Dietetics
  • Public Health, Environmental and Occupational Health
  • Space and Planetary Science


  • Astrometry
  • Galaxies: dwarf
  • Local Group
  • Methods: data analysis


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