11. The Minor Planet Center does not directly list a semi-major axis for this comet. 12. This is the major axis of the ellipse, the line through its longest part. 13. One can think of the semi-major axis as an ellipse's " long radius ". 14. The gravitational encounter causes Neptune's semi-major axis to jump outward. 15. Its semi-major axis is among the smallest for hot Jupiters. 16. Objects in hyperbolic orbits have negative semi major axis , giving them a positive orbital energy. 17. Gliese 422 b's semi-major axis is astronomical units and its orbital period is Earth days. 18. The major axis travels east-west from the entrance through the court to the waterside terrace. 19. The baptismal font, altar, major axis of the ellipse. 20. The orbital circumference should be computed from the semi-major axis using Ramanujan's approximation for ellipses.
