(9142) Rhesus
This object has a more recent orbit available here
Object
| Object | (9142) Rhesus |
| Diameter(1) | 45 km |
| Dynamic class(1) | trojan |
| Absolute magnitude | 10.60 |
| G slop | 0.15 |
(1) Data from the johnston archive list.
Orbital elements
| Epoch (Julian date) | 2458600.5 |
| Semi major axis | 5.168449 ± 0.000000 au |
| Eccentricity | 0.130088175 ± 0.000000073 |
| Inclination | 12.804471492 ± 0.000004295 ° |
| Longitude of ascending node | 141.187317 ± 0.000029 ° |
| Argument of perihelia | 173.167061 ± 0.000069 ° |
| Mean anomaly | 232.843594 ± 0.000051 ° |
| Orbital period | 11.75 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv4 |
| Observation file |
omc_ast_NIMAv4.txt |
| bsp file | 9142_Rhesus_nima_v4.bsp |
| Date of first observation | 1954-12-22 |
| Date of last observation | 2020-08-13 |
| Number of observations used in the fit | 1762 |
| Number of rejected observations | 14 |
| Number of DES observations | 5 |
| Number of MPC observations | 1768 |
| Number of unpublished observations | 3 |
| RMS of observations | 0.417 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) |
| 2021-01 | 0.016 | 0.013 |
| 2021-07 | 0.026 | 0.023 |
| 2022-01 | 0.031 | 0.021 |
| 2022-07 | 0.059 | 0.036 |
| 2023-01 | 0.046 | 0.023 |
| 2023-07 | 0.077 | 0.032 |
| 2024-01 | 0.056 | 0.019 |
| 2024-07 | 0.066 | 0.021 |
| 2025-01 | 0.060 | 0.017 |
Ephemeris comparison
Difference between NIMAv4 and JPL38 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.