Doppler spectroscopy
Radial-velocity comparison tables
Columns: Planet | Planet Type | Semimajor Axis ( AU ) | Orbital Period | Radial velocity (m/s) | Detectable by:
51 Pegasi b | Hot Jupiter | 0.05 | 4.23 days | 55.9 | First-generation spectrograph | 55 Cancri d | Gas giant | 5.77 | 14.29 years | 45.2 | First-generation spectrograph | Jupiter | Gas giant | 5.2 | 11.86 years | 12.4 | First-generation spectrograph | Gliese 581c | Super-Earth | 0.07 | 12.92 days | 3.18 | Second-generation spectrograph | Saturn | Gas giant | 9.58 | 29.46 years | 2.75 | Second-generation spectrograph | Alpha Centauri Bb | Terrestrial planet | 0.04 | 3.23 days | 0.51 | Second-generation spectrograph | Neptune | Ice giant | 30.1 | 164.79 years | 0.281 | Third-generation spectrograph | Earth | Habitable planet | 1 | 365.26 days | 0.089 | Third-generation spectrograph (likely) | Pluto | Dwarf planet | 39.26 | 246.04 years | 3e-05 | Not detectable