(9142) Rhesus
Object
| Object |
(9142) Rhesus |
| Diameter(1) |
45 km |
| Dynamic class(1) |
trojan |
| Absolute magnitude |
10.71 |
| G slop |
0.15 |
Orbital elements
| Epoch (Julian date) |
2459800.5 |
| Semi major axis |
5.160007 ± 0.000000 au |
| Eccentricity |
0.130895888 ± 0.000000051 |
| Inclination |
12.807325564 ± 0.000004285 ° |
| Longitude of ascending node |
141.200651 ± 0.000029 ° |
| Argument of perihelia |
173.880564 ± 0.000041 ° |
| Mean anomaly |
333.013821 ± 0.000033 ° |
| Orbital period |
11.72 yr |
Ephemeris & Observations
| Ephemeris version |
NIMAv5 |
| Observation file (documentation) |
omc_ast_NIMAv5.txt |
| bsp file |
9142_Rhesus_nima_v5.bsp |
| Date of first observation |
1954-12-22 |
| Date of last observation |
2022-07-16 |
| Number of observations used in the fit |
2164 |
| Number of rejected observations |
13 |
| Number of DES observations |
5 |
| Number of MPC observations |
2170 |
| Number of unpublished observations |
2 |
| RMS of observations |
0.393 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv5 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date |
σα (arcsec) |
σδ (arcsec) |
| 2022-01 |
0.028 |
0.020 |
| 2022-07 |
0.053 |
0.033 |
| 2023-01 |
0.042 |
0.022 |
| 2023-07 |
0.070 |
0.030 |
| 2024-01 |
0.052 |
0.018 |
| 2024-07 |
0.062 |
0.020 |
| 2025-01 |
0.058 |
0.016 |
| 2025-07 |
0.051 |
0.016 |
| 2026-01 |
0.060 |
0.022 |
Ephemeris comparison
Difference between NIMAv5 and JPL42 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