(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 | 0.138429535 ± 0.000000011 |
Inclination | 22.048314939 ± 0.000000498 ° |
Longitude of ascending node | 44.351819 ± 0.000005 ° |
Argument of perihelia | 307.949112 ± 0.000004 ° |
Mean anomaly | 203.758486 ± 0.000013 ° |
Orbital period | 11.91 yr |
Ephemeris & Observations
Ephemeris version | NIMAv2 |
Observation file |
omc_ast_NIMAv2.txt |
bsp file | 617_Patroclus_nima_v2.bsp |
Date of first observation | 1906-10-17 |
Date of last observation | 2019-07-21 |
Number of observations used in the fit | 2680 |
Number of rejected observations | 56 |
Number of DES observations | 0 |
Number of MPC observations | 2697 |
Number of unpublished observations | 0 |
RMS of observations | 0.109 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv2 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
date | σα (arcsec) | σδ (arcsec) |
2019-01 | 0.013 | 0.011 |
2019-07 | 0.013 | 0.012 |
2020-01 | 0.018 | 0.015 |
2020-07 | 0.021 | 0.020 |
2021-01 | 0.025 | 0.017 |
2021-07 | 0.034 | 0.026 |
2022-01 | 0.034 | 0.012 |
2022-07 | 0.055 | 0.013 |
2023-01 | 0.040 | 0.002 |
Ephemeris comparison
Difference between NIMAv2 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.