(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) | 2458200.5 |
Semi major axis | 5.170981 ± 0.000001 au |
Eccentricity | 0.129436781 ± 0.000000101 |
Inclination | 12.800829841 ± 0.000008487 ° |
Longitude of ascending node | 141.180771 ± 0.000036 ° |
Argument of perihelia | 173.166411 ± 0.000070 ° |
Mean anomaly | 199.269428 ± 0.000055 ° |
Orbital period | 11.76 yr |
Ephemeris & Observations
Ephemeris version | NIMAv1 |
Observation file |
omc_ast_NIMAv1.txt |
bsp file | 9142_Rhesus_nima_v1.bsp |
Date of first observation | 1954-12-22 |
Date of last observation | 2018-11-09 |
Number of observations used in the fit | 1209 |
Number of rejected observations | 5 |
Number of DES observations | 5 |
Number of MPC observations | 1209 |
Number of unpublished observations | 0 |
RMS of observations | 0.488 arcsec |
Residuals
![residual plot](data/nima/Rhesus/omc_NIMAv1.png)
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 | 0.038 | 0.032 |
2018-07 | 0.032 | 0.025 |
2019-01 | 0.044 | 0.030 |
2019-07 | 0.041 | 0.028 |
2020-01 | 0.052 | 0.031 |
2020-07 | 0.057 | 0.033 |
2021-01 | 0.062 | 0.031 |
2021-07 | 0.085 | 0.040 |
2022-01 | 0.073 | 0.028 |
Ephemeris comparison
![residual plot](data/nima/Rhesus/diff_NIMAv1_JPL26.png)
Difference between NIMAv1 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.