(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 | 10.71 |
| G slop | 0.15 |
(1) Data from the johnston archive list.
Orbital elements
| Epoch (Julian date) | 2459800.5 |
| Semi major axis | 5.160007 ± 0.000000 au |
| Eccentricity | 0.130895882 ± 0.000000050 |
| Inclination | 12.807325524 ± 0.000004081 ° |
| Longitude of ascending node | 141.200655 ± 0.000027 ° |
| Argument of perihelia | 173.880566 ± 0.000038 ° |
| Mean anomaly | 333.013814 ± 0.000028 ° |
| Orbital period | 11.72 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv6 |
| Observation file |
omc_ast_NIMAv6.txt |
| bsp file | 9142_Rhesus_nima_v6.bsp |
| Date of first observation | 1954-12-22 |
| Date of last observation | 2023-07-03 |
| Number of observations used in the fit | 2759 |
| Number of rejected observations | 252 |
| Number of DES observations | 5 |
| Number of MPC observations | 3003 |
| Number of unpublished observations | 3 |
| RMS of observations | 0.471 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv6 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date | σα (arcsec) | σδ (arcsec) |
| 2023-01 | 0.035 | 0.021 |
| 2023-07 | 0.060 | 0.028 |
| 2024-01 | 0.045 | 0.017 |
| 2024-07 | 0.054 | 0.018 |
| 2025-01 | 0.051 | 0.014 |
| 2025-07 | 0.047 | 0.015 |
| 2026-01 | 0.055 | 0.021 |
| 2026-07 | 0.043 | 0.018 |
| 2027-01 | 0.057 | 0.028 |
Ephemeris comparison
Difference between NIMAv6 and JPL48 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.