Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_11869952_1 (derivatives VARCHAR, rocket_launch VARCHAR)
### Question:
Which authority has a rocket launch called rehbar-5?
### Answer:
SELECT COUNT(derivatives) FROM table_11869952_1 WHERE rocket_launch = "Rehbar-5"