(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 | 8.23 |
| G slop | 0.15 |
(1) Data from the johnston archive list.
Orbital elements
| Epoch (Julian date) | 2459800.5 |
| Semi major axis | 5.210104 ± 0.000000 au |
| Eccentricity | 0.139867900 ± 0.000000054 |
| Inclination | 22.062062404 ± 0.000005440 ° |
| Longitude of ascending node | 44.358470 ± 0.000014 ° |
| Argument of perihelia | 308.184386 ± 0.000026 ° |
| Mean anomaly | 303.031905 ± 0.000026 ° |
| Orbital period | 11.89 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv6 |
| Observation file |
omc_ast_NIMAv6.txt |
| bsp file | 617_Patroclus_nima_v6.bsp |
| Date of first observation | 1906-10-17 |
| Date of last observation | 2023-07-01 |
| Number of observations used in the fit | 5134 |
| Number of rejected observations | 27 |
| Number of DES observations | 0 |
| Number of MPC observations | 5161 |
| Number of unpublished observations | 0 |
| RMS of observations | 1.531 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv6 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date | σα (arcsec) | σδ (arcsec) |
| 2023-01 | 0.034 | 0.017 |
| 2023-07 | 0.051 | 0.033 |
| 2024-01 | 0.040 | 0.025 |
| 2024-07 | 0.045 | 0.041 |
| 2025-01 | 0.044 | 0.039 |
| 2025-07 | 0.040 | 0.035 |
| 2026-01 | 0.048 | 0.044 |
| 2026-07 | 0.039 | 0.025 |
| 2027-01 | 0.053 | 0.032 |
Ephemeris comparison
Difference between NIMAv6 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.