(3317) Paris


Object

Object (3317) Paris
Diameter(1) 119 km
Dynamic class(1) trojan
Absolute magnitude 8.40
G slop 0.15
(1) Data from the johnston archive list.

Orbital elements

Epoch (Julian date) 2458600.5
Semi major axis 5.221142 ± 0.000000 au
Eccentricity 0.127299689 ± 0.000000074
Inclination 27.870168246 ± 0.000002001 °
Longitude of ascending node 135.903458 ± 0.000013 °
Argument of perihelia 149.979775 ± 0.000048 °
Mean anomaly 278.616709 ± 0.000041 °
Orbital period 11.93 yr

Ephemeris & Observations

Ephemeris version NIMAv4
Observation file (documentation) omc_ast_NIMAv4.txt
bsp file 3317_Paris_nima_v4.bsp
Date of first observation 1963-08-21
Date of last observation 2020-08-31
Number of observations used in the fit 2605
Number of rejected observations 11
Number of DES observations 0
Number of MPC observations 2593
Number of unpublished observations 23
RMS of observations 0.360 arcsec

Residuals

residual plot

Residuals in right ascension and declination compared to NIMAv4 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.

Orbit quality

date σα (arcsec) σδ (arcsec)
2020-01 0.007 0.007
2020-07 0.008 0.008
2021-01 0.014 0.011
2021-07 0.030 0.021
2022-01 0.029 0.019
2022-07 0.059 0.029
2023-01 0.045 0.020
2023-07 0.065 0.021
2024-01 0.056 0.015

Ephemeris comparison

residual plot

Difference between NIMAv4 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.

Previous NIMA versions