(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) | 2458200.5 |
| Semi major axis | 5.216725 ± 0.000000 au |
| Eccentricity | 0.138176522 ± 0.000000073 |
| Inclination | 22.047490521 ± 0.000003672 ° |
| Longitude of ascending node | 44.353891 ± 0.000014 ° |
| Argument of perihelia | 308.154158 ± 0.000021 ° |
| Mean anomaly | 170.391457 ± 0.000024 ° |
| Orbital period | 11.92 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv1 |
| Observation file |
omc_ast_NIMAv1.txt |
| bsp file | 617_Patroclus_nima_v1.bsp |
| Date of first observation | 1906-10-17 |
| Date of last observation | 2019-01-29 |
| Number of observations used in the fit | 2396 |
| Number of rejected observations | 2 |
| Number of DES observations | 0 |
| Number of MPC observations | 2398 |
| Number of unpublished observations | 0 |
| RMS of observations | 2.358 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv1 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date | σα (arcsec) | σδ (arcsec) |
| 2018-01 | 0.015 | 0.015 |
| 2018-07 | 0.014 | 0.014 |
| 2019-01 | 0.017 | 0.017 |
| 2019-07 | 0.018 | 0.018 |
| 2020-01 | 0.021 | 0.020 |
| 2020-07 | 0.025 | 0.024 |
| 2021-01 | 0.026 | 0.021 |
| 2021-07 | 0.035 | 0.031 |
| 2022-01 | 0.033 | 0.019 |
Ephemeris comparison
Difference between NIMAv1 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.