(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 |
0.139533380 ± 0.000000026 |
| Inclination |
22.064856386 ± 0.000002683 ° |
| Longitude of ascending node |
44.349939 ± 0.000003 ° |
| Argument of perihelia |
308.672200 ± 0.000013 ° |
| Mean anomaly |
25.589971 ± 0.000012 ° |
| Orbital period |
11.88 yr |
Ephemeris & Observations
| Ephemeris version |
NIMAv10 |
| Observation file (documentation) |
omc_ast_NIMAv10.txt |
| bsp file |
617_Patroclus_nima_v10.bsp |
| Date of first observation |
1906-10-17 |
| Date of last observation |
2025-10-05 |
| Number of observations used in the fit |
6433 |
| Number of rejected observations |
40 |
| Number of DES observations |
0 |
| Number of MPC observations |
6447 |
| Number of unpublished observations |
26 |
| RMS of observations |
1.370 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv10 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date |
σα (arcsec) |
σδ (arcsec) |
| 2024-01 |
0.012 |
0.010 |
| 2024-07 |
0.015 |
0.014 |
| 2025-01 |
0.015 |
0.014 |
| 2025-07 |
0.017 |
0.014 |
| 2026-01 |
0.020 |
0.019 |
| 2026-07 |
0.020 |
0.011 |
| 2027-01 |
0.030 |
0.015 |
| 2027-07 |
0.023 |
0.007 |
| 2028-01 |
0.033 |
0.011 |
Ephemeris comparison
Difference between NIMAv10 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