(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 | 39.712388 ± 0.000927 au |
Eccentricity | 0.242211096 ± 0.000003588 |
Inclination | 19.580718052 ± 0.000139115 ° |
Longitude of ascending node | 70.991073 ± 0.000354 ° |
Argument of perihelia | 298.580518 ± 0.003741 ° |
Mean anomaly | 284.986801 ± 0.003925 ° |
Orbital period | 250.26 yr |
Ephemeris & Observations
Ephemeris version | NIMAv9 |
Observation file |
omc_ast_NIMAv9.txt |
bsp file | 28978_Ixion_nima_v9.bsp |
Date of first observation | 1982-07-17 |
Date of last observation | 2020-08-17 |
Number of observations used in the fit | 426 |
Number of rejected observations | 22 |
Number of DES observations | 0 |
Number of MPC observations | 174 |
Number of unpublished observations | 274 |
RMS of observations | 0.202 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv9 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
date | σα (arcsec) | σδ (arcsec) |
2020-01 | 0.034 | 0.007 |
2020-07 | 0.024 | 0.005 |
2021-01 | 0.040 | 0.008 |
2021-07 | 0.032 | 0.007 |
2022-01 | 0.048 | 0.008 |
2022-07 | 0.042 | 0.009 |
2023-01 | 0.057 | 0.009 |
2023-07 | 0.053 | 0.011 |
2024-01 | 0.068 | 0.011 |
Ephemeris comparison
Difference between NIMAv9 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.