(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 | 10.75 |
| G slop | 0.15 |
(1) Data from the johnston archive list.
Orbital elements
| Epoch (Julian date) | 2460600.5 |
| Semi major axis | 5.156625 ± 0.000000 au |
| Eccentricity | 0.130288445 ± 0.000000047 |
| Inclination | 12.809575790 ± 0.000003929 ° |
| Longitude of ascending node | 141.198624 ± 0.000026 ° |
| Argument of perihelia | 174.150684 ± 0.000035 ° |
| Mean anomaly | 40.124981 ± 0.000025 ° |
| Orbital period | 11.71 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv7 |
| Observation file |
omc_ast_NIMAv7.txt |
| bsp file | 9142_Rhesus_nima_v7.bsp |
| Date of first observation | 1954-12-22 |
| Date of last observation | 2024-07-12 |
| Number of observations used in the fit | 3191 |
| Number of rejected observations | 252 |
| Number of DES observations | 5 |
| Number of MPC observations | 3435 |
| Number of unpublished observations | 3 |
| RMS of observations | 0.445 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv7 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date | σα (arcsec) | σδ (arcsec) |
| 2024-01 | 0.035 | 0.015 |
| 2024-07 | 0.043 | 0.016 |
| 2025-01 | 0.041 | 0.012 |
| 2025-07 | 0.040 | 0.013 |
| 2026-01 | 0.048 | 0.019 |
| 2026-07 | 0.038 | 0.017 |
| 2027-01 | 0.052 | 0.026 |
| 2027-07 | 0.037 | 0.020 |
| 2028-01 | 0.050 | 0.029 |
Ephemeris comparison
Difference between NIMAv7 and JPL55 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.