(28978) Ixion
Object
| Object |
(28978) Ixion |
| Diameter(1) |
617 km |
| Dynamic class(1) |
plutino |
| Absolute magnitude |
3.60 |
| G slop |
0.15 |
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 (documentation) |
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| Number of unpublished observations |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.
Previous NIMA versions