(3317) Paris


This object has a more recent orbit available here

Object

Object (3317) Paris
Diameter(1) 119 km
Dynamic class(1) trojan
Absolute magnitude 8.30
G slop 0.15
(1) Data from the johnston archive list.

Orbital elements

Epoch (Julian date) 2458200.5
Semi major axis 5.222299 ± 0.000000 au
Eccentricity 0.126808522 ± 0.000000055
Inclination 27.866188788 ± 0.000006031 °
Longitude of ascending node 135.896808 ± 0.000008 °
Argument of perihelia 149.914231 ± 0.000038 °
Mean anomaly 245.596826 ± 0.000037 °
Orbital period 11.93 yr

Ephemeris & Observations

Ephemeris version NIMAv1
Observation file (documentation) omc_ast_NIMAv1.txt
bsp file 3317_Paris_nima_v1.bsp
Date of first observation 1963-08-21
Date of last observation 2019-01-26
Number of observations used in the fit 1768
Number of rejected observations 9
Number of DES observations 0
Number of MPC observations 1777
Number of unpublished observations 0
RMS of observations 0.428 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 0.020 0.016
2018-07 0.017 0.014
2019-01 0.026 0.018
2019-07 0.026 0.019
2020-01 0.033 0.021
2020-07 0.041 0.025
2021-01 0.038 0.022
2021-07 0.060 0.030
2022-01 0.043 0.019

Ephemeris comparison

residual plot

Difference between NIMAv1 and JPL39 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.