(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 | 39.713214 ± 0.000984 au |
| Eccentricity | 0.242209267 ± 0.000007235 |
| Inclination | 19.580706130 ± 0.000244282 ° |
| Longitude of ascending node | 70.991081 ± 0.000368 ° |
| Argument of perihelia | 298.576718 ± 0.003977 ° |
| Mean anomaly | 284.990480 ± 0.003992 ° |
| Orbital period | 250.27 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv8 |
| Observation file |
omc_ast_NIMAv8.txt |
| bsp file | 28978_Ixion_nima_v8.bsp |
| Date of first observation | 1982-07-17 |
| Date of last observation | 2019-09-28 |
| Number of observations used in the fit | 430 |
| Number of rejected observations | 18 |
| Number of DES observations | 0 |
| Number of MPC observations | 174 |
| Number of unpublished observations | 274 |
| RMS of observations | 0.204 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv8 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date | σα (arcsec) | σδ (arcsec) |
| 2019-01 | 0.062 | 0.024 |
| 2019-07 | 0.058 | 0.030 |
| 2020-01 | 0.079 | 0.029 |
| 2020-07 | 0.077 | 0.036 |
| 2021-01 | 0.098 | 0.034 |
| 2021-07 | 0.099 | 0.043 |
| 2022-01 | 0.120 | 0.040 |
| 2022-07 | 0.124 | 0.050 |
| 2023-01 | 0.145 | 0.046 |
Ephemeris comparison
Difference between NIMAv8 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.