(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 | 39.713022 ± 0.001004 au |
Eccentricity | 0.242213879 ± 0.000008705 |
Inclination | 19.580688639 ± 0.000284694 ° |
Longitude of ascending node | 70.991073 ± 0.000373 ° |
Argument of perihelia | 298.577494 ± 0.004065 ° |
Mean anomaly | 284.990246 ± 0.004014 ° |
Orbital period | 250.27 yr |
Ephemeris & Observations
Ephemeris version | NIMAv7 |
Observation file |
omc_ast_NIMAv7.txt |
bsp file | 28978_Ixion_nima_v7.bsp |
Date of first observation | 1982-07-17 |
Date of last observation | 2019-07-02 |
Number of observations used in the fit | 413 |
Number of rejected observations | 18 |
Number of DES observations | 0 |
Number of MPC observations | 174 |
Number of unpublished observations | 257 |
RMS of observations | 0.207 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv7 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
date | σα (arcsec) | σδ (arcsec) |
2019-01 | 0.076 | 0.027 |
2019-07 | 0.073 | 0.035 |
2020-01 | 0.096 | 0.033 |
2020-07 | 0.096 | 0.042 |
2021-01 | 0.120 | 0.040 |
2021-07 | 0.123 | 0.050 |
2022-01 | 0.147 | 0.047 |
2022-07 | 0.154 | 0.059 |
2023-01 | 0.178 | 0.053 |
Ephemeris comparison
Difference between NIMAv7 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.