(617) Patroclus
This object has a more recent orbit available here
Object
| Object | (617) Patroclus |
| Diameter(1) | 140 km |
| Dynamic class(1) | trojan |
| Absolute magnitude | 8.24 |
| G slop | 0.15 |
(1) Data from the johnston archive list.
Orbital elements
| Epoch (Julian date) | 2456610.696480604 |
| Semi major axis | 5.217271 ± 0.000000 au |
| Eccentricity | 0.139693183 ± 0.000000039 |
| Inclination | 22.051810572 ± 0.000001411 ° |
| Longitude of ascending node | 44.366439 ± 0.000003 ° |
| Argument of perihelia | 308.333203 ± 0.000006 ° |
| Mean anomaly | 38.459682 ± 0.000011 ° |
| Orbital period | 11.92 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv4 |
| Observation file |
omc_ast_NIMAv4.txt |
| bsp file | 617_Patroclus_nima_v4.bsp |
| Date of first observation | 1906-10-17 |
| Date of last observation | 2020-09-03 |
| Number of observations used in the fit | 3270 |
| Number of rejected observations | 19 |
| Number of DES observations | 0 |
| Number of MPC observations | 3250 |
| Number of unpublished observations | 0 |
| RMS of observations | 0.120 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv4 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date | σα (arcsec) | σδ (arcsec) |
| 2021-01 | 0.023 | 0.015 |
| 2021-07 | 0.031 | 0.023 |
| 2022-01 | 0.031 | 0.011 |
| 2022-07 | 0.050 | 0.011 |
| 2023-01 | 0.037 | 0.002 |
| 2023-07 | 0.048 | 0.025 |
| 2024-01 | 0.035 | 0.018 |
| 2024-07 | 0.031 | 0.029 |
| 2025-01 | 0.029 | 0.025 |
Ephemeris comparison
Difference between NIMAv4 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.