(28978) Ixion
Object
| Object |
(28978) Ixion |
| Diameter(1) |
617 km |
| Dynamic class(1) |
plutino |
| Absolute magnitude |
3.44 |
| G slop |
0.15 |
Orbital elements
| Epoch (Julian date) |
2459800.5 |
| Semi major axis |
39.664021 ± 0.000175 au |
| Eccentricity |
0.247144023 ± 0.000002490 |
| Inclination |
19.643362059 ± 0.000014942 ° |
| Longitude of ascending node |
71.059914 ± 0.000015 ° |
| Argument of perihelia |
299.168262 ± 0.000708 ° |
| Mean anomaly |
291.227260 ± 0.000893 ° |
| Orbital period |
249.81 yr |
Ephemeris & Observations
| Ephemeris version |
NIMAv12 |
| Observation file (documentation) |
omc_ast_NIMAv12.txt |
| bsp file |
28978_Ixion_nima_v12.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 |
2 |
| Number of DES observations |
0 |
| Number of MPC observations |
194 |
| Number of unpublished observations |
255 |
| RMS of observations |
0.199 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv12 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date |
σα (arcsec) |
σδ (arcsec) |
| 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 |
| 2024-07 |
0.015 |
0.009 |
| 2025-01 |
0.017 |
0.009 |
| 2025-07 |
0.021 |
0.011 |
| 2026-01 |
0.023 |
0.011 |
Ephemeris comparison
Difference between NIMAv12 and JPL18 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