Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
what is the ngc number when the constellation is leo and the declination (j2000) is °42′13″?

### Inputs:
table_name: table, columns: ['NGC number', 'Object type', 'Constellation', 'Right ascension ( J2000 )', 'Declination ( J2000 )']

### Response:
SELECT AVG NGC number FROM table WHERE Constellation = leo AND Declination ( J2000 ) = °42′13″