(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 ± 0.000001 au
Eccentricity 0.130088152 ± 0.000000096
Inclination 12.804471630 ± 0.000008185 °
Longitude of ascending node 141.187301 ± 0.000032 °
Argument of perihelia 173.167072 ± 0.000072 °
Mean anomaly 232.843603 ± 0.000056 °
Orbital period 11.75 yr

Ephemeris & Observations

Ephemeris version NIMAv2
Observation file (documentation) omc_ast_NIMAv2.txt
bsp file 9142_Rhesus_nima_v2.bsp
Date of first observation 1954-12-22
Date of last observation 2019-06-09
Number of observations used in the fit 1430
Number of rejected observations 7
Number of DES observations 5
Number of MPC observations 1432
Number of unpublished observations 0
RMS of observations 0.458 arcsec

Residuals

residual plot

Residuals in right ascension and declination compared to NIMAv2 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.

Orbit quality

date σα (arcsec) σδ (arcsec)
2019-01 0.032 0.026
2019-07 0.030 0.023
2020-01 0.039 0.026
2020-07 0.044 0.029
2021-01 0.051 0.028
2021-07 0.072 0.038
2022-01 0.064 0.028
2022-07 0.108 0.040
2023-01 0.075 0.024

Ephemeris comparison

residual plot

Difference between NIMAv2 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.