26P/Grigg-Skjellerup

eccentricity

.6396679618697105 ± 6.0032E-8

semi-major axis

3.024224445052753 au ± 5.1447E-8

perihelion distance

1.089724958049302 au ± 1.9011E-7

inclination; angle with respect to x-y ecliptic plane

22.45511403015216 deg ± 1.0203E-5

longitude of the ascending node

211.633966473815 deg ± 3.0332E-5

argument of perihelion

1.896085645552865 deg ± 3.2501E-5

mean anomaly

273.4178382900974 deg ± 6.5112E-6

time of perihelion passage

2456479.503621726282 TDB ± 4.4628E-5

sidereal orbital period

1920.965017929774 d ± 4.9018E-5

mean motion

.1874058073103134 deg/d ± 4.7821E-9

aphelion distance

4.958723932056204 au ± 8.4356E-8

comet total magnitude

16.5 ± 0.7

comet total magnitude slope

5.5

diameter

2.6 km

Published JPL orbital elements describe their stated epoch; they are not current positions. Small-body diameters can be effective/model-dependent sizes, not spherical shapes. Missing measurements remain unavailable. Pluto’s diameter uses the New Horizons reference rather than an empty SBDB field. Orbital epoch: JD 2456017.5 TDB.