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:
| Star | Stellar classification | Distance from Earth ( ly ) | Constellation | Dust (or Debris; Temperature (K) | System | Dust (or Debris) Location (AU) | Cool Dust > 10 AU | Stellar Age (Myr) |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| η Corvi | F2V | 59 | Corvus | > 80 | Unary | < 3.5 | yes | 1500 |
| HD 113766 | F3V | 424 | Centaurus | ~440 | Binary | 1.8 | yes | ~10-16 |
| BD +20307 | G0V | ~300 | Aries | > 100 | Binary | 1 | no | > 1000 |
| HD 72905 | G1.5Vb | 46.5 | Ursa Major | unknown | Unary | 0.23 | yes | 400 |
| HD 12039 | G3-5V | 138 | Cetus | 110 | close stellar companion | 4-6 | no | 7.5-8 |
| HD 69830 | K0V | 40.6 | Puppis | unknown | 3 Neptune planets < 1 AU | 1 | no | 2000 - 5000 |
Question:
Name the dust for star being η corvi
Answer:
> 80