(42301) 2001UR163
This object has a more recent orbit available here
Object
| Object | (42301) 2001UR163 |
| Diameter(1) | 352 km |
| Dynamic class(1) | res4:9 |
| Absolute magnitude | 4.20 |
| G slop | 0.15 |
(1) Data from the johnston archive list.
Orbital elements
| Epoch (Julian date) | 2460600.5 |
| Semi major axis | 51.917457 ± 0.002909 au |
| Eccentricity | 0.280800454 ± 0.000010205 |
| Inclination | 0.751353352 ± 0.000009974 ° |
| Longitude of ascending node | 302.259312 ± 0.007747 ° |
| Argument of perihelia | 344.171597 ± 0.011272 ° |
| Mean anomaly | 84.031062 ± 0.009905 ° |
| Orbital period | 374.09 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv5 |
| Observation file |
omc_ast_NIMAv5.txt |
| bsp file | 42301_2001UR163_nima_v5.bsp |
| Date of first observation | 1982-07-27 |
| Date of last observation | 2023-11-19 |
| Number of observations used in the fit | 356 |
| Number of rejected observations | 2 |
| Number of DES observations | 0 |
| Number of MPC observations | 358 |
| Number of unpublished observations | 0 |
| RMS of observations | 0.151 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv5 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date | σα (arcsec) | σδ (arcsec) |
| 2024-01 | 0.078 | 0.062 |
| 2024-07 | 0.107 | 0.066 |
| 2025-01 | 0.087 | 0.066 |
| 2025-07 | 0.121 | 0.072 |
| 2026-01 | 0.097 | 0.072 |
| 2026-07 | 0.137 | 0.078 |
| 2027-01 | 0.109 | 0.077 |
| 2027-07 | 0.153 | 0.084 |
| 2028-01 | 0.122 | 0.083 |
Ephemeris comparison
Difference between NIMAv5 and JPL22 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.