(28978) Ixion


This object has a more recent orbit available here

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 39.713022 ± 0.001004 au
Eccentricity 0.242213879 ± 0.000008705
Inclination 19.580688639 ± 0.000284694 °
Longitude of ascending node 70.991073 ± 0.000373 °
Argument of perihelia 298.577494 ± 0.004065 °
Mean anomaly 284.990246 ± 0.004014 °
Orbital period 250.27 yr

Ephemeris & Observations

Ephemeris version NIMAv7
Observation file (documentation) omc_ast_NIMAv7.txt
bsp file 28978_Ixion_nima_v7.bsp
Date of first observation 1982-07-17
Date of last observation 2019-07-02
Number of observations used in the fit 413
Number of rejected observations 18
Number of DES observations 0
Number of MPC observations 174
Number of unpublished observations 257
RMS of observations 0.207 arcsec

Residuals

residual plot

Residuals in right ascension and declination compared to NIMAv7 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.

Orbit quality

date σα (arcsec) σδ (arcsec)
2019-01 0.076 0.027
2019-07 0.073 0.035
2020-01 0.096 0.033
2020-07 0.096 0.042
2021-01 0.120 0.040
2021-07 0.123 0.050
2022-01 0.147 0.047
2022-07 0.154 0.059
2023-01 0.178 0.053

Ephemeris comparison

residual plot

Difference between NIMAv7 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.