(617) Patroclus
Object
| Object |
(617) Patroclus |
| Diameter(1) |
140 km |
| Dynamic class(1) |
trojan |
| Absolute magnitude |
8.33 |
| G slop |
0.15 |
Orbital elements
| Epoch (Julian date) |
2460800.5 |
| Semi major axis |
5.206045 ± 0.000000 au |
| Eccentricity |
0.139533416 ± 0.000000052 |
| Inclination |
22.064852194 ± 0.000005132 ° |
| Longitude of ascending node |
44.349937 ± 0.000014 ° |
| Argument of perihelia |
308.672201 ± 0.000021 ° |
| Mean anomaly |
25.589967 ± 0.000018 ° |
| Orbital period |
11.88 yr |
Ephemeris & Observations
| Ephemeris version |
NIMAv8 |
| Observation file (documentation) |
omc_ast_NIMAv8.txt |
| bsp file |
617_Patroclus_nima_v8.bsp |
| Date of first observation |
1906-10-17 |
| Date of last observation |
2025-07-13 |
| Number of observations used in the fit |
6170 |
| Number of rejected observations |
28 |
| Number of DES observations |
0 |
| Number of MPC observations |
6198 |
| Number of unpublished observations |
0 |
| RMS of observations |
1.398 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 |
0.025 |
0.018 |
| 2024-07 |
0.027 |
0.026 |
| 2025-01 |
0.027 |
0.025 |
| 2025-07 |
0.027 |
0.024 |
| 2026-01 |
0.033 |
0.031 |
| 2026-07 |
0.028 |
0.020 |
| 2027-01 |
0.040 |
0.028 |
| 2027-07 |
0.028 |
0.017 |
| 2028-01 |
0.038 |
0.023 |
Ephemeris comparison
Difference between NIMAv8 and JPL82 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