(9142) Rhesus


This object has a more recent orbit available here

Object

Object (9142) Rhesus
Diameter(1) 45 km
Dynamic class(1) trojan
Absolute magnitude 10.60
G slop 0.15
(1) Data from the johnston archive list.

Orbital elements

Epoch (Julian date) 2458600.5
Semi major axis 5.168449 ± 0.000000 au
Eccentricity 0.130088186 ± 0.000000075
Inclination 12.804473188 ± 0.000004549 °
Longitude of ascending node 141.187314 ± 0.000028 °
Argument of perihelia 173.167065 ± 0.000068 °
Mean anomaly 232.843591 ± 0.000051 °
Orbital period 11.75 yr

Ephemeris & Observations

Ephemeris version NIMAv3
Observation file (documentation) omc_ast_NIMAv3.txt
bsp file 9142_Rhesus_nima_v3.bsp
Date of first observation 1954-12-22
Date of last observation 2020-07-14
Number of observations used in the fit 1754
Number of rejected observations 13
Number of DES observations 5
Number of MPC observations 1760
Number of unpublished observations 2
RMS of observations 0.417 arcsec

Residuals

residual plot

Residuals in right ascension and declination compared to NIMAv3 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 0.010
2021-01 0.017 0.014
2021-07 0.027 0.024
2022-01 0.032 0.022
2022-07 0.061 0.036
2023-01 0.047 0.023
2023-07 0.078 0.031
2024-01 0.057 0.018

Ephemeris comparison

residual plot

Difference between NIMAv3 and JPL26 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.