(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 | 39.711566 ± 0.001362 au |
| Eccentricity | 0.242225679 ± 0.000011935 |
| Inclination | 19.580693342 ± 0.000393900 ° |
| Longitude of ascending node | 70.991083 ± 0.000495 ° |
| Argument of perihelia | 298.583607 ± 0.005549 ° |
| Mean anomaly | 284.985412 ± 0.005227 ° |
| Orbital period | 250.26 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv6 |
| Observation file |
omc_ast_NIMAv6.txt |
| bsp file | 28978_Ixion_nima_v6.bsp |
| Date of first observation | 1982-07-17 |
| Date of last observation | 2015-03-21 |
| Number of observations used in the fit | 406 |
| Number of rejected observations | 16 |
| Number of DES observations | 0 |
| Number of MPC observations | 172 |
| Number of unpublished observations | 250 |
| RMS of observations | 0.220 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv6 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date | σα (arcsec) | σδ (arcsec) |
| 2018-01 | 0.084 | 0.029 |
| 2018-07 | 0.075 | 0.039 |
| 2019-01 | 0.110 | 0.037 |
| 2019-07 | 0.104 | 0.050 |
| 2020-01 | 0.140 | 0.046 |
| 2020-07 | 0.137 | 0.061 |
| 2021-01 | 0.173 | 0.056 |
| 2021-07 | 0.176 | 0.073 |
| 2022-01 | 0.212 | 0.066 |
Ephemeris comparison
Difference between NIMAv6 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.