(530930) 2011WG157
Object
| Object |
(530930) 2011WG157 |
| Diameter(1) |
168 km |
| Dynamic class(1) |
NepTrjL4 |
| Absolute magnitude |
7.27 |
| G slop |
0.15 |
Orbital elements
| Epoch (Julian date) |
2459800.5 |
| Semi major axis |
30.119451 ± 0.003031 au |
| Eccentricity |
0.024148025 ± 0.000070829 |
| Inclination |
22.280675556 ± 0.000113548 ° |
| Longitude of ascending node |
351.994057 ± 0.000449 ° |
| Argument of perihelia |
214.711118 ± 0.090571 ° |
| Mean anomaly |
222.080080 ± 0.090272 ° |
| Orbital period |
165.30 yr |
Ephemeris & Observations
| Ephemeris version |
NIMAv2 |
| Observation file (documentation) |
omc_ast_NIMAv2.txt |
| bsp file |
530930_2011WG157_nima_v2.bsp |
| Date of first observation |
2004-09-21 |
| Date of last observation |
2022-01-10 |
| Number of observations used in the fit |
92 |
| Number of rejected observations |
0 |
| Number of DES observations |
0 |
| Number of MPC observations |
92 |
| Number of unpublished observations |
0 |
| RMS of observations |
0.184 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv2 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date |
σα (arcsec) |
σδ (arcsec) |
| 2022-01 |
0.352 |
0.254 |
| 2022-07 |
0.505 |
0.250 |
| 2023-01 |
0.453 |
0.290 |
| 2023-07 |
0.627 |
0.276 |
| 2024-01 |
0.577 |
0.326 |
| 2024-07 |
0.769 |
0.302 |
| 2025-01 |
0.726 |
0.361 |
| 2025-07 |
0.931 |
0.325 |
| 2026-01 |
0.900 |
0.392 |
Ephemeris comparison
Difference between NIMAv2 and JPL9 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.