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

### Instruction:
What's the total number of NGC that has a Declination ( J2000 ) of °15′55″, and an Apparent magnitude greater than 10?

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

### Response:
SELECT SUM NGC number FROM table WHERE Declination ( J2000 ) = °15′55″ AND Apparent magnitude > 10