(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 | 39.711945 ± 0.000151 au |
| Eccentricity | 0.242212349 ± 0.000002405 |
| Inclination | 19.580712312 ± 0.000053700 ° |
| Longitude of ascending node | 70.991072 ± 0.000083 ° |
| Argument of perihelia | 298.582441 ± 0.000542 ° |
| Mean anomaly | 284.984987 ± 0.000797 ° |
| Orbital period | 250.26 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv11 |
| Observation file |
omc_ast_NIMAv11.txt |
| bsp file | 28978_Ixion_nima_v11.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 | 23 |
| Number of DES observations | 0 |
| Number of MPC observations | 194 |
| Number of unpublished observations | 276 |
| RMS of observations | 0.199 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv11 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date | σα (arcsec) | σδ (arcsec) |
| 2020-01 | 0.004 | 0.003 |
| 2020-07 | 0.003 | 0.003 |
| 2021-01 | 0.003 | 0.003 |
| 2021-07 | 0.004 | 0.004 |
| 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 |
Ephemeris comparison
Difference between NIMAv11 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.