(90377) Sedna
This object has a more recent orbit available here
Object
| Object | (90377) Sedna |
| Diameter(1) | 995 km |
| Dynamic class(1) | Sednoid |
| Absolute magnitude | 1.50 |
| G slop | 0.15 |
(1) Data from the johnston archive list.
Orbital elements
| Epoch (Julian date) | 2458600.5 |
| Semi major axis | 479.068512 ± 0.392464 au |
| Eccentricity | 0.841015639 ± 0.000130977 |
| Inclination | 11.929876996 ± 0.000324063 ° |
| Longitude of ascending node | 144.325629 ± 0.004548 ° |
| Argument of perihelia | 311.518074 ± 0.001777 ° |
| Mean anomaly | 358.036468 ± 0.002406 ° |
| Orbital period | 10485.87 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv8 |
| Observation file |
omc_ast_NIMAv8.txt |
| bsp file | 90377_Sedna_nima_v8.bsp |
| Date of first observation | 1990-09-25 |
| Date of last observation | 2019-10-26 |
| Number of observations used in the fit | 224 |
| Number of rejected observations | 40 |
| Number of DES observations | 0 |
| Number of MPC observations | 162 |
| Number of unpublished observations | 102 |
| RMS of observations | 0.361 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 | 0.061 | 0.039 |
| 2019-07 | 0.069 | 0.044 |
| 2020-01 | 0.079 | 0.046 |
| 2020-07 | 0.084 | 0.050 |
| 2021-01 | 0.100 | 0.053 |
| 2021-07 | 0.104 | 0.057 |
| 2022-01 | 0.123 | 0.061 |
| 2022-07 | 0.127 | 0.064 |
| 2023-01 | 0.149 | 0.069 |
Ephemeris comparison
Difference between NIMAv8 and JPL28 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.