(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 | 8.19 |
| G slop | 0.15 |
(1) Data from the johnston archive list.
Orbital elements
| Epoch (Julian date) | 2458600.5 |
| Semi major axis | 5.215835 ± 0.000000 au |
| Eccentricity | 0.138431978 ± 0.000000019 |
| Inclination | 22.048307104 ± 0.000002124 ° |
| Longitude of ascending node | 44.351797 ± 0.000009 ° |
| Argument of perihelia | 307.949166 ± 0.000016 ° |
| Mean anomaly | 203.758193 ± 0.000025 ° |
| Orbital period | 11.91 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv3 |
| Observation file |
omc_ast_NIMAv3.txt |
| bsp file | 617_Patroclus_nima_v3.bsp |
| Date of first observation | 1906-10-17 |
| Date of last observation | 2020-02-03 |
| Number of observations used in the fit | 2833 |
| Number of rejected observations | 23 |
| Number of DES observations | 0 |
| Number of MPC observations | 2817 |
| Number of unpublished observations | 0 |
| RMS of observations | 0.120 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv3 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date | σα (arcsec) | σδ (arcsec) |
| 2019-01 | 0.020 | 0.018 |
| 2019-07 | 0.020 | 0.019 |
| 2020-01 | 0.025 | 0.022 |
| 2020-07 | 0.028 | 0.027 |
| 2021-01 | 0.032 | 0.023 |
| 2021-07 | 0.044 | 0.034 |
| 2022-01 | 0.043 | 0.016 |
| 2022-07 | 0.071 | 0.017 |
| 2023-01 | 0.052 | 0.005 |
Ephemeris comparison
Difference between NIMAv3 and JPL54 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.