(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 ± 0.000001 au |
| Eccentricity | 0.130088152 ± 0.000000096 |
| Inclination | 12.804471630 ± 0.000008185 ° |
| Longitude of ascending node | 141.187301 ± 0.000032 ° |
| Argument of perihelia | 173.167072 ± 0.000072 ° |
| Mean anomaly | 232.843603 ± 0.000056 ° |
| Orbital period | 11.75 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv2 |
| Observation file |
omc_ast_NIMAv2.txt |
| bsp file | 9142_Rhesus_nima_v2.bsp |
| Date of first observation | 1954-12-22 |
| Date of last observation | 2019-06-09 |
| Number of observations used in the fit | 1430 |
| Number of rejected observations | 7 |
| Number of DES observations | 5 |
| Number of MPC observations | 1432 |
| Number of unpublished observations | 0 |
| RMS of observations | 0.458 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv2 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date | σα (arcsec) | σδ (arcsec) |
| 2019-01 | 0.032 | 0.026 |
| 2019-07 | 0.030 | 0.023 |
| 2020-01 | 0.039 | 0.026 |
| 2020-07 | 0.044 | 0.029 |
| 2021-01 | 0.051 | 0.028 |
| 2021-07 | 0.072 | 0.038 |
| 2022-01 | 0.064 | 0.028 |
| 2022-07 | 0.108 | 0.040 |
| 2023-01 | 0.075 | 0.024 |
Ephemeris comparison
Difference between NIMAv2 and JPL26 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.