(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) | 2458200.5 |
| Semi major axis | 5.170981 ± 0.000001 au |
| Eccentricity | 0.129436781 ± 0.000000101 |
| Inclination | 12.800829841 ± 0.000008487 ° |
| Longitude of ascending node | 141.180771 ± 0.000036 ° |
| Argument of perihelia | 173.166411 ± 0.000070 ° |
| Mean anomaly | 199.269428 ± 0.000055 ° |
| Orbital period | 11.76 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv1 |
| Observation file |
omc_ast_NIMAv1.txt |
| bsp file | 9142_Rhesus_nima_v1.bsp |
| Date of first observation | 1954-12-22 |
| Date of last observation | 2018-11-09 |
| Number of observations used in the fit | 1209 |
| Number of rejected observations | 5 |
| Number of DES observations | 5 |
| Number of MPC observations | 1209 |
| Number of unpublished observations | 0 |
| RMS of observations | 0.488 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv1 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date | σα (arcsec) | σδ (arcsec) |
| 2018-01 | 0.038 | 0.032 |
| 2018-07 | 0.032 | 0.025 |
| 2019-01 | 0.044 | 0.030 |
| 2019-07 | 0.041 | 0.028 |
| 2020-01 | 0.052 | 0.031 |
| 2020-07 | 0.057 | 0.033 |
| 2021-01 | 0.062 | 0.031 |
| 2021-07 | 0.085 | 0.040 |
| 2022-01 | 0.073 | 0.028 |
Ephemeris comparison
Difference between NIMAv1 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.