(28978) Ixion


Object

Object (28978) Ixion
Diameter(1) 617 km
Dynamic class(1) plutino
Absolute magnitude 3.60
G slop 0.15
(1) Data from the johnston archive list.

Orbital elements

Epoch (Julian date) 2458200.5
Semi major axis 39.712434 ± 0.000921 au
Eccentricity 0.242210894 ± 0.000003562
Inclination 19.580719316 ± 0.000138001 °
Longitude of ascending node 70.991073 ± 0.000351 °
Argument of perihelia 298.580320 ± 0.003713 °
Mean anomaly 284.986978 ± 0.003897 °
Orbital period 250.26 yr

Ephemeris & Observations

Ephemeris version NIMAv10
Observation file (documentation) omc_ast_NIMAv10.txt
bsp file 28978_Ixion_nima_v10.bsp
Date of first observation 1982-07-17
Date of last observation 2020-08-17
Number of observations used in the fit 446
Number of rejected observations 23
Number of DES observations 0
Number of MPC observations 194
Number of unpublished observations 275
RMS of observations 0.198 arcsec

Residuals

residual plot

Residuals in right ascension and declination compared to NIMAv10 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.

Orbit quality

date σα (arcsec) σδ (arcsec)
2020-01 0.033 0.007
2020-07 0.024 0.005
2021-01 0.040 0.008
2021-07 0.032 0.007
2022-01 0.047 0.008
2022-07 0.041 0.009
2023-01 0.057 0.009
2023-07 0.053 0.011
2024-01 0.068 0.010

Ephemeris comparison

residual plot

Difference between NIMAv10 and JPL15 in right ascension (weighted by cos δ) and in declination.
Gray area represents the 1-σ uncertainty of NIMA ephemeris. Green dots represent the DES observations.

Previous NIMA versions