(9142) Rhesus
Object
| Object |
(9142) Rhesus |
| Diameter(1) |
45 km |
| Dynamic class(1) |
trojan |
| Absolute magnitude |
10.76 |
| G slop |
0.15 |
Orbital elements
| Epoch (Julian date) |
2460800.5 |
| Semi major axis |
5.155397 ± 0.000000 au |
| Eccentricity |
0.130001226 ± 0.000000041 |
| Inclination |
12.809635239 ± 0.000003923 ° |
| Longitude of ascending node |
141.198736 ± 0.000025 ° |
| Argument of perihelia |
174.135954 ± 0.000035 ° |
| Mean anomaly |
57.000670 ± 0.000024 ° |
| Orbital period |
11.71 yr |
Ephemeris & Observations
| Ephemeris version |
NIMAv8 |
| Observation file (documentation) |
omc_ast_NIMAv8.txt |
| bsp file |
9142_Rhesus_nima_v8.bsp |
| Date of first observation |
1954-12-22 |
| Date of last observation |
2025-07-12 |
| Number of observations used in the fit |
3709 |
| Number of rejected observations |
252 |
| Number of DES observations |
5 |
| Number of MPC observations |
3953 |
| Number of unpublished observations |
3 |
| RMS of observations |
0.420 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv8 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date |
σα (arcsec) |
σδ (arcsec) |
| 2024-01 |
0.027 |
0.015 |
| 2024-07 |
0.032 |
0.014 |
| 2025-01 |
0.031 |
0.010 |
| 2025-07 |
0.031 |
0.011 |
| 2026-01 |
0.038 |
0.017 |
| 2026-07 |
0.032 |
0.016 |
| 2027-01 |
0.044 |
0.025 |
| 2027-07 |
0.032 |
0.019 |
| 2028-01 |
0.045 |
0.029 |
Ephemeris comparison
Difference between NIMAv8 and JPL60 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