(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 0.127299705 ± 0.000000035
Inclination 27.870168579 ± 0.000001610 °
Longitude of ascending node 135.903463 ± 0.000005 °
Argument of perihelia 149.979768 ± 0.000027 °
Mean anomaly 278.616712 ± 0.000024 °
Orbital period 11.93 yr

Ephemeris & Observations

Ephemeris version NIMAv6
Observation file (documentation) omc_ast_NIMAv6.txt
bsp file 3317_Paris_nima_v6.bsp
Date of first observation 1963-08-21
Date of last observation 2021-08-10
Number of observations used in the fit 2719
Number of rejected observations 12
Number of DES observations 0
Number of MPC observations 2703
Number of unpublished observations 28
RMS of observations 0.354 arcsec

Residuals

residual plot

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)
2021-01 0.003 0.003
2021-07 0.004 0.004
2022-01 0.006 0.005
2022-07 0.018 0.009
2023-01 0.016 0.008
2023-07 0.032 0.011
2024-01 0.028 0.009
2024-07 0.036 0.011
2025-01 0.038 0.010

Ephemeris comparison

residual plot

Difference between NIMAv6 and JPL55 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