Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| 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 | 1.0 | 365.26 days | 0.089 | Third-generation spectrograph (likely) |
| Pluto | Dwarf planet | 39.26 | 246.04 years | 3e-05 | Not detectable |
Question:
What planet orbits in 3.23 days?
Answer:
Alpha Centauri Bb