(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 | 1.55 |
| G slop | 0.15 |
(1) Data from the johnston archive list.
Orbital elements
| Epoch (Julian date) | 2459800.5 |
| Semi major axis | 521.375128 ± 0.299793 au |
| Eccentricity | 0.853494905 ± 0.000084621 |
| Inclination | 11.930885255 ± 0.000002905 ° |
| Longitude of ascending node | 144.225768 ± 0.000602 ° |
| Argument of perihelia | 310.931956 ± 0.002838 ° |
| Mean anomaly | 358.401771 ± 0.001371 ° |
| Orbital period | 11905.12 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv11 |
| Observation file |
omc_ast_NIMAv11.txt |
| bsp file | 90377_Sedna_nima_v11.bsp |
| Date of first observation | 1990-09-25 |
| Date of last observation | 2022-02-23 |
| Number of observations used in the fit | 480 |
| Number of rejected observations | 7 |
| Number of DES observations | 0 |
| Number of MPC observations | 414 |
| Number of unpublished observations | 73 |
| RMS of observations | 0.261 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) |
| 2022-01 | 0.066 | 0.043 |
| 2022-07 | 0.067 | 0.045 |
| 2023-01 | 0.080 | 0.048 |
| 2023-07 | 0.081 | 0.050 |
| 2024-01 | 0.096 | 0.054 |
| 2024-07 | 0.098 | 0.056 |
| 2025-01 | 0.113 | 0.060 |
| 2025-07 | 0.117 | 0.062 |
| 2026-01 | 0.133 | 0.066 |
Ephemeris comparison
Difference between NIMAv11 and JPL37 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.