(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 | 479.138419 ± 0.414449 au |
| Eccentricity | 0.841042815 ± 0.000139958 |
| Inclination | 11.929883980 ± 0.000339094 ° |
| Longitude of ascending node | 144.325221 ± 0.006778 ° |
| Argument of perihelia | 311.521569 ± 0.001892 ° |
| Mean anomaly | 358.036804 ± 0.002504 ° |
| Orbital period | 10488.17 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv6 |
| Observation file |
omc_ast_NIMAv6.txt |
| bsp file | 90377_Sedna_nima_v6.bsp |
| Date of first observation | 1990-09-25 |
| Date of last observation | 2016-02-19 |
| Number of observations used in the fit | 213 |
| Number of rejected observations | 39 |
| Number of DES observations | 0 |
| Number of MPC observations | 156 |
| Number of unpublished observations | 96 |
| RMS of observations | 0.367 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv6 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date | σα (arcsec) | σδ (arcsec) |
| 2018-01 | 0.061 | 0.038 |
| 2018-07 | 0.089 | 0.047 |
| 2019-01 | 0.085 | 0.045 |
| 2019-07 | 0.112 | 0.054 |
| 2020-01 | 0.112 | 0.053 |
| 2020-07 | 0.140 | 0.062 |
| 2021-01 | 0.143 | 0.062 |
| 2021-07 | 0.173 | 0.071 |
| 2022-01 | 0.178 | 0.072 |
Ephemeris comparison
Difference between NIMAv6 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.