Due to its rapid rotation, the primary has a polar radius about and an equatorial radius of about.
12.
This is of course related to the fact that the polar radius is about 21 kilometers less than the equatorial radius
13.
This rotation is giving the star an oblate shape with an equator that is 17 % larger than the polar radius.
14.
The resulting equatorial bulge is about 20 % larger than the polar radius, giving the star the shape of an oblate spheroid.
15.
And a and b are the equatorial radius ( semi-major axis ) and the polar radius ( semi-minor axis ), respectively.
16.
Since the Earth's polar radius is shorter, this would allow a perigee less than 6540 km, but what apogee would be required?
17.
It has a projected rotational velocity of 255 km / s, resulting in an equatorial bulge with a radius 13 % larger than the polar radius.
18.
The value for the polar radius in this section has been rounded to the nearest 0.1 m, which is expected to be adequate for most uses.
19.
The spectrum of this star fits a stellar classification of A7IVn, which suggests it is an oblate shape with an equatorial bulge that is 29 % larger than the polar radius.
20.
Mars is actually egg shaped, where its north and south polar radii differ by approximately, however this difference is small enough that the average polar radius is used to define its ellipsoid.
