| Autor: |
D. H. Staelin, M. M. Colavita, M. Shao |
| Rok vydání: |
1985 |
| Zdroj: |
Symposium - International Astronomical Union. 112:59-63 |
| ISSN: |
0074-1809 |
| DOI: |
10.1017/s0074180900146352 |
| Popis: |
Detection of planets by virtue of their gravitational perturbations of nearby visible stars generally requires relative astrometric accuracies of ~ 3 × 10−4 arc sec for Jovian planets and ~ 3 × 10−7 arc sec for terrestrial planets. Two-color optical astrometric interferometers on earth should be capable of ~ 10−4 arc sec rms accuracy for stars brighter than magnitude 7–10, while small one-color space systems should achieve at least ~ 10−5 arc sec. Two-color systems permit correction every few milliseconds for the random wavefront tilt due to atmospheric turbulence; the correction is based on the observed offset between the red and blue fringes, and the known atmospheric dispersion. A 3.4-meter baseline interferometer on Mount Wilson has demonstrated ~ 0.02 arc sec rms fluctuations for 1-second samples. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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