(42301) 2001UR163
This object has a more recent orbit available here
Object
| Object | (42301) 2001UR163 |
| Diameter(1) | 671 km |
| Dynamic class(1) | res4:9 |
| Absolute magnitude | 4.21 |
| G slop | 0.15 |
(1) Data from the johnston archive list.
Orbital elements
| Epoch (Julian date) | 2459800.5 |
| Semi major axis | 51.960526 ± 0.003134 au |
| Eccentricity | 0.284376997 ± 0.000012011 |
| Inclination | 0.752613016 ± 0.000010487 ° |
| Longitude of ascending node | 301.656019 ± 0.008487 ° |
| Argument of perihelia | 344.836811 ± 0.012071 ° |
| Mean anomaly | 81.421360 ± 0.010410 ° |
| Orbital period | 374.56 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv3 |
| Observation file |
omc_ast_NIMAv3.txt |
| bsp file | 42301_2001UR163_nima_v3.bsp |
| Date of first observation | 1982-07-27 |
| Date of last observation | 2021-11-11 |
| Number of observations used in the fit | 306 |
| Number of rejected observations | 2 |
| Number of DES observations | 0 |
| Number of MPC observations | 308 |
| Number of unpublished observations | 0 |
| RMS of observations | 0.157 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv3 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date | σα (arcsec) | σδ (arcsec) |
| 2022-01 | 0.076 | 0.061 |
| 2022-07 | 0.111 | 0.067 |
| 2023-01 | 0.084 | 0.066 |
| 2023-07 | 0.126 | 0.073 |
| 2024-01 | 0.095 | 0.072 |
| 2024-07 | 0.142 | 0.080 |
| 2025-01 | 0.108 | 0.078 |
| 2025-07 | 0.160 | 0.086 |
| 2026-01 | 0.122 | 0.084 |
Ephemeris comparison
Difference between NIMAv3 and JPL18 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.