(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 | 479.079763 ± 0.274402 au |
| Eccentricity | 0.841018657 ± 0.000091993 |
| Inclination | 11.929877073 ± 0.000217551 ° |
| Longitude of ascending node | 144.325844 ± 0.003634 ° |
| Argument of perihelia | 311.517347 ± 0.001303 ° |
| Mean anomaly | 358.036555 ± 0.001671 ° |
| Orbital period | 10486.24 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv9 |
| Observation file |
omc_ast_NIMAv9.txt |
| bsp file | 90377_Sedna_nima_v9.bsp |
| Date of first observation | 1990-09-25 |
| Date of last observation | 2020-08-28 |
| Number of observations used in the fit | 413 |
| Number of rejected observations | 39 |
| Number of DES observations | 0 |
| Number of MPC observations | 346 |
| Number of unpublished observations | 106 |
| RMS of observations | 0.269 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 | 0.055 | 0.037 |
| 2020-07 | 0.056 | 0.040 |
| 2021-01 | 0.069 | 0.043 |
| 2021-07 | 0.070 | 0.045 |
| 2022-01 | 0.086 | 0.049 |
| 2022-07 | 0.087 | 0.051 |
| 2023-01 | 0.104 | 0.056 |
| 2023-07 | 0.106 | 0.058 |
| 2024-01 | 0.124 | 0.062 |
Ephemeris comparison
Difference between NIMAv9 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.