(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 | 51.960026 ± 0.002929 au |
| Eccentricity | 0.284374763 ± 0.000010340 |
| Inclination | 0.752613578 ± 0.000010334 ° |
| Longitude of ascending node | 301.657129 ± 0.007777 ° |
| Argument of perihelia | 344.834413 ± 0.011231 ° |
| Mean anomaly | 81.423082 ± 0.009661 ° |
| Orbital period | 374.55 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv4 |
| Observation file |
omc_ast_NIMAv4.txt |
| bsp file | 42301_2001UR163_nima_v4.bsp |
| Date of first observation | 1982-07-27 |
| Date of last observation | 2022-12-14 |
| Number of observations used in the fit | 343 |
| Number of rejected observations | 2 |
| Number of DES observations | 0 |
| Number of MPC observations | 345 |
| Number of unpublished observations | 0 |
| RMS of observations | 0.152 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv4 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date | σα (arcsec) | σδ (arcsec) |
| 2023-01 | 0.073 | 0.058 |
| 2023-07 | 0.096 | 0.062 |
| 2024-01 | 0.079 | 0.062 |
| 2024-07 | 0.109 | 0.067 |
| 2025-01 | 0.088 | 0.067 |
| 2025-07 | 0.123 | 0.073 |
| 2026-01 | 0.098 | 0.072 |
| 2026-07 | 0.139 | 0.079 |
| 2027-01 | 0.110 | 0.078 |
Ephemeris comparison
Difference between NIMAv4 and JPL20 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.