(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) |
2460600.5 |
| Semi major axis |
5.206645 ± 0.000000 au |
| Eccentricity |
0.139696314 ± 0.000000053 |
| Inclination |
22.063825283 ± 0.000005246 ° |
| Longitude of ascending node |
44.351421 ± 0.000014 ° |
| Argument of perihelia |
308.591188 ± 0.000023 ° |
| Mean anomaly |
9.051196 ± 0.000022 ° |
| Orbital period |
11.88 yr |
Ephemeris & Observations
| Ephemeris version |
NIMAv7 |
| Observation file (documentation) |
omc_ast_NIMAv7.txt |
| bsp file |
617_Patroclus_nima_v7.bsp |
| Date of first observation |
1906-10-17 |
| Date of last observation |
2024-07-09 |
| Number of observations used in the fit |
5545 |
| Number of rejected observations |
27 |
| Number of DES observations |
0 |
| Number of MPC observations |
5572 |
| Number of unpublished observations |
0 |
| RMS of observations |
1.474 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv7 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date |
σα (arcsec) |
σδ (arcsec) |
| 2024-01 |
0.032 |
0.022 |
| 2024-07 |
0.037 |
0.034 |
| 2025-01 |
0.036 |
0.033 |
| 2025-07 |
0.035 |
0.031 |
| 2026-01 |
0.043 |
0.039 |
| 2026-07 |
0.035 |
0.023 |
| 2027-01 |
0.048 |
0.031 |
| 2027-07 |
0.033 |
0.017 |
| 2028-01 |
0.043 |
0.024 |
Ephemeris comparison
Difference between NIMAv7 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