(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 | 4.10 |
| G slop | 0.15 |
(1) Data from the johnston archive list.
Orbital elements
| Epoch (Julian date) | 2458600.5 |
| Semi major axis | 51.460238 ± 0.003067 au |
| Eccentricity | 0.286892921 ± 0.000012867 |
| Inclination | 0.753162612 ± 0.000173699 ° |
| Longitude of ascending node | 301.375235 ± 0.035993 ° |
| Argument of perihelia | 343.164984 ± 0.028547 ° |
| Mean anomaly | 80.118819 ± 0.009965 ° |
| Orbital period | 369.16 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv2 |
| Observation file |
omc_ast_NIMAv2.txt |
| bsp file | 42301_2001UR163_nima_v2.bsp |
| Date of first observation | 1982-07-27 |
| Date of last observation | 2020-11-16 |
| Number of observations used in the fit | 271 |
| Number of rejected observations | 2 |
| Number of DES observations | 0 |
| Number of MPC observations | 273 |
| Number of unpublished observations | 0 |
| RMS of observations | 0.163 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) |
| 2021-01 | 0.085 | 0.067 |
| 2021-07 | 0.127 | 0.075 |
| 2022-01 | 0.096 | 0.073 |
| 2022-07 | 0.145 | 0.082 |
| 2023-01 | 0.110 | 0.080 |
| 2023-07 | 0.164 | 0.089 |
| 2024-01 | 0.126 | 0.087 |
| 2024-07 | 0.186 | 0.097 |
| 2025-01 | 0.143 | 0.094 |
Ephemeris comparison
Difference between NIMAv2 and JPL15 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.