(28978) Ixion
Object
Object |
(28978) Ixion |
Diameter(1) |
617 km |
Dynamic class(1) |
plutino |
Absolute magnitude |
3.60 |
G slop |
0.15 |
Orbital elements
Epoch (Julian date) |
2458200.5 |
Semi major axis |
39.711945 ± 0.000151 au |
Eccentricity |
0.242212349 ± 0.000002405 |
Inclination |
19.580712312 ± 0.000053700 ° |
Longitude of ascending node |
70.991072 ± 0.000083 ° |
Argument of perihelia |
298.582441 ± 0.000542 ° |
Mean anomaly |
284.984987 ± 0.000797 ° |
Orbital period |
250.26 yr |
Ephemeris & Observations
Ephemeris version |
NIMAv11 |
Observation file (documentation) |
omc_ast_NIMAv11.txt |
bsp file |
28978_Ixion_nima_v11.bsp |
Date of first observation |
1982-07-17 |
Date of last observation |
2021-04-28 |
Number of observations used in the fit |
447 |
Number of rejected observations |
23 |
Number of DES observations |
0 |
Number of MPC observations |
194 |
Number of unpublished observations |
276 |
RMS of observations |
0.199 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv11 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
date |
σα (arcsec) |
σδ (arcsec) |
2020-01 |
0.004 |
0.003 |
2020-07 |
0.003 |
0.003 |
2021-01 |
0.003 |
0.003 |
2021-07 |
0.004 |
0.004 |
2022-01 |
0.005 |
0.004 |
2022-07 |
0.007 |
0.005 |
2023-01 |
0.008 |
0.006 |
2023-07 |
0.010 |
0.007 |
2024-01 |
0.012 |
0.008 |
Ephemeris comparison
Difference between NIMAv11 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