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:
| NGC number | Object type | Constellation | Right ascension ( J2000 ) | Declination ( J2000 ) |
| --- | --- | --- | --- | --- |
| 3310.0 | Spiral galaxy | Ursa Major | 10h38m45.9s | °30′12″ |
| 3311.0 | Elliptical galaxy | Hydra | 10h36m43.3s | °31′41″ |
| 3312.0 | Spiral galaxy | Hydra | 10h37m02.3s | °33′54″ |
| 3314.0 | Spiral galaxy occulted by another spiral galaxy | Hydra | 10h37m12.8s | °41′04″ |
| 3344.0 | Spiral galaxy | Leo Minor | 10h43m31.1s | °55′20″ |
| 3351.0 | Spiral galaxy | Leo | 10h43m57.7s | °42′13″ |
| 3359.0 | Spiral galaxy | Ursa Major | 10h46m36.6s | °13′25″ |
| 3368.0 | Spiral galaxy | Leo | 10h46m45.8s | °49′10″ |
| 3369.0 | Lenticular galaxy | Hydra | 10h46m44.9s | °14′34″ |
| 3370.0 | Spiral galaxy | Leo | 10h47m04.2s | °16′23″ |
| 3371.0 | Lenticular galaxy | Leo | 10h48m16.9s | °37′43″ |
| 3372.0 | Diffuse nebula | Carina | 10h44m19.0s | °53′21″ |
| 3379.0 | Elliptical galaxy | Leo | 10h47m49.8s | °34′55″ |
| 3384.0 | Lenticular galaxy | Leo | 10h48m16.9s | °37′43″ |
Question:
what is the ngc number when the constellation is leo and the declination (j2000) is °42′13″?
Answer:
3351.0