(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 |
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Number of unpublished observations | 0 |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

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

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.