The argument of perihelion
is an angle that defines the orientation of an orbit's perihelion with respect to the ecliptic plane (see figure, page 19), somewhat like a latitude angle on Earth defines an orientation with respect to the equator.
Table 1 presents orbital elements: a: semimajor axis, e: eccentricity, i: inclination, [OMEGA]: longitude of the ascending node, [omega]: argument of perihelion
, and M: mean anomaly The orbits are computed from 569 astrometric positions from which 8 observations were rejected as outliers, and also on 29 radar observations with 4 observations rejected as outliers.
While there was tolerably good agreement in orbital eccentricity, argument of perihelion
and nodal longitude, it is difficult to reconcile the perihelion distance and inclination with the 3D/Biela values.
When looking at the orbits of Sedna and 2012 [VP.sub.113] as well as 10 extreme Kuiper Belt objects near the outer edge of the Kuiper Belt, Trujillo and I noticed a similarity: a similar argument of perihelion
for all 12 objects.
Argument of perihelion
43.63720 [degrees] Longitude of ascending node 126.37563 [degrees] Eccentricity 0.5147984 Inclination 19.81182 [degrees] Currently the ascending node is between the orbits of Mercury and Venus, and the descending node between the orbits of Earth and Mars.