(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 | 3.44 |
| G slop | 0.15 |
(1) Data from the johnston archive list.
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 |
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| Number of unpublished observations | 255 |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.