(9142) Rhesus
Object
| Object |
(9142) Rhesus |
| Diameter(1) |
45 km |
| Dynamic class(1) |
trojan |
| Absolute magnitude |
10.60 |
| G slop |
0.15 |
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 (documentation) |
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| Number of unpublished observations |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.
Previous NIMA versions