Simplify the following text for a Grade 7 native English-speaking person.
Original: The orbital period is approximately 16.50 hours , the eccentricity below 0.03 ( best estimate 0.01 Â 0.02 ) .
Simplified: The orbital period is about 16.50 hours , the eccentricity below 0.03 ( best estimate 0.01 Â 0.02 ) .