(617) Patroclus


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Number of unpublished observations 0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

residual plot

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

residual plot

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.