(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 | 39.712434 ± 0.000921 au |
| Eccentricity | 0.242210894 ± 0.000003562 |
| Inclination | 19.580719316 ± 0.000138001 ° |
| Longitude of ascending node | 70.991073 ± 0.000351 ° |
| Argument of perihelia | 298.580320 ± 0.003713 ° |
| Mean anomaly | 284.986978 ± 0.003897 ° |
| Orbital period | 250.26 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv10 |
| Observation file |
omc_ast_NIMAv10.txt |
| bsp file | 28978_Ixion_nima_v10.bsp |
| Date of first observation | 1982-07-17 |
| Date of last observation | 2020-08-17 |
| Number of observations used in the fit | 446 |
| Number of rejected observations | 23 |
| Number of DES observations | 0 |
| Number of MPC observations | 194 |
| Number of unpublished observations | 275 |
| RMS of observations | 0.198 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv10 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date | σα (arcsec) | σδ (arcsec) |
| 2020-01 | 0.033 | 0.007 |
| 2020-07 | 0.024 | 0.005 |
| 2021-01 | 0.040 | 0.008 |
| 2021-07 | 0.032 | 0.007 |
| 2022-01 | 0.047 | 0.008 |
| 2022-07 | 0.041 | 0.009 |
| 2023-01 | 0.057 | 0.009 |
| 2023-07 | 0.053 | 0.011 |
| 2024-01 | 0.068 | 0.010 |
Ephemeris comparison
Difference between NIMAv10 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.