(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 | 479.079031 ± 0.270127 au |
| Eccentricity | 0.841018512 ± 0.000090440 |
| Inclination | 11.929877320 ± 0.000217110 ° |
| Longitude of ascending node | 144.325904 ± 0.003507 ° |
| Argument of perihelia | 311.517359 ± 0.001278 ° |
| Mean anomaly | 358.036548 ± 0.001648 ° |
| Orbital period | 10486.22 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv10 |
| Observation file |
omc_ast_NIMAv10.txt |
| bsp file | 90377_Sedna_nima_v10.bsp |
| Date of first observation | 1990-09-25 |
| Date of last observation | 2020-11-10 |
| Number of observations used in the fit | 429 |
| Number of rejected observations | 39 |
| Number of DES observations | 0 |
| Number of MPC observations | 362 |
| Number of unpublished observations | 106 |
| RMS of observations | 0.266 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv10 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date | σα (arcsec) | σδ (arcsec) |
| 2021-01 | 0.066 | 0.042 |
| 2021-07 | 0.066 | 0.044 |
| 2022-01 | 0.081 | 0.048 |
| 2022-07 | 0.081 | 0.050 |
| 2023-01 | 0.098 | 0.054 |
| 2023-07 | 0.100 | 0.056 |
| 2024-01 | 0.118 | 0.060 |
| 2024-07 | 0.120 | 0.062 |
| 2025-01 | 0.139 | 0.067 |
Ephemeris comparison
Difference between NIMAv10 and JPL34 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.