(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 39.712388 ± 0.000927 au
Eccentricity 0.242211096 ± 0.000003588
Inclination 19.580718052 ± 0.000139115 °
Longitude of ascending node 70.991073 ± 0.000354 °
Argument of perihelia 298.580518 ± 0.003741 °
Mean anomaly 284.986801 ± 0.003925 °
Orbital period 250.26 yr

Ephemeris & Observations

Ephemeris version NIMAv9
Observation file (documentation) omc_ast_NIMAv9.txt
bsp file 28978_Ixion_nima_v9.bsp
Date of first observation 1982-07-17
Date of last observation 2020-08-17
Number of observations used in the fit 426
Number of rejected observations 22
Number of DES observations 0
Number of MPC observations 174
Number of unpublished observations 274
RMS of observations 0.202 arcsec

Residuals

residual plot

Residuals in right ascension and declination compared to NIMAv9 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.

Orbit quality

date σα (arcsec) σδ (arcsec)
2020-01 0.034 0.007
2020-07 0.024 0.005
2021-01 0.040 0.008
2021-07 0.032 0.007
2022-01 0.048 0.008
2022-07 0.042 0.009
2023-01 0.057 0.009
2023-07 0.053 0.011
2024-01 0.068 0.011

Ephemeris comparison

residual plot

Difference between NIMAv9 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.