(90377) Sedna
Object
| Object |
(90377) Sedna |
| Diameter(1) |
995 km |
| Dynamic class(1) |
Sednoid |
| Absolute magnitude |
1.54 |
| G slop |
0.15 |
Orbital elements
| Epoch (Julian date) |
2460600.5 |
| Semi major axis |
552.175903 ± 0.306260 au |
| Eccentricity |
0.861812959 ± 0.000076652 |
| Inclination |
11.927724262 ± 0.000003010 ° |
| Longitude of ascending node |
144.394633 ± 0.000555 ° |
| Argument of perihelia |
310.875575 ± 0.002615 ° |
| Mean anomaly |
358.594474 ± 0.001171 ° |
| Orbital period |
12975.51 yr |
Ephemeris & Observations
| Ephemeris version |
NIMAv13 |
| Observation file (documentation) |
omc_ast_NIMAv13.txt |
| bsp file |
90377_Sedna_nima_v13.bsp |
| Date of first observation |
1990-09-25 |
| Date of last observation |
2024-03-18 |
| Number of observations used in the fit |
565 |
| Number of rejected observations |
40 |
| Number of DES observations |
0 |
| Number of MPC observations |
499 |
| Number of unpublished observations |
106 |
| RMS of observations |
0.250 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv13 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date |
σα (arcsec) |
σδ (arcsec) |
| 2024-01 |
0.077 |
0.049 |
| 2024-07 |
0.080 |
0.051 |
| 2025-01 |
0.092 |
0.054 |
| 2025-07 |
0.095 |
0.056 |
| 2026-01 |
0.108 |
0.059 |
| 2026-07 |
0.113 |
0.061 |
| 2027-01 |
0.126 |
0.065 |
| 2027-07 |
0.132 |
0.067 |
| 2028-01 |
0.145 |
0.070 |
Ephemeris comparison
Difference between NIMAv13 and JPL42 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.
Previous NIMA versions