(3451) Mentor
This object has a more recent orbit available here
Object
Object | (3451) Mentor |
Diameter(1) | 126 km |
Dynamic class(1) | trojan |
Absolute magnitude | 8.50 |
G slop | 0.15 |
(1) Data from the johnston archive list.
Orbital elements
Epoch (Julian date) | 2458200.5 |
Semi major axis | 5.138179 ± 0.000000 au |
Eccentricity | 0.069160820 ± 0.000000064 |
Inclination | 24.654198676 ± 0.000005125 ° |
Longitude of ascending node | 179.660769 ± 0.000010 ° |
Argument of perihelia | 131.488068 ± 0.000058 ° |
Mean anomaly | 236.386312 ± 0.000058 ° |
Orbital period | 11.65 yr |
Ephemeris & Observations
Ephemeris version | NIMAv1 |
Observation file |
omc_ast_NIMAv1.txt |
bsp file | 3451_Mentor_nima_v1.bsp |
Date of first observation | 1950-04-21 |
Date of last observation | 2019-01-29 |
Number of observations used in the fit | 2009 |
Number of rejected observations | 10 |
Number of DES observations | 0 |
Number of MPC observations | 2019 |
Number of unpublished observations | 0 |
RMS of observations | 0.517 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 | 0.018 | 0.014 |
2018-07 | 0.017 | 0.014 |
2019-01 | 0.022 | 0.015 |
2019-07 | 0.026 | 0.019 |
2020-01 | 0.027 | 0.017 |
2020-07 | 0.039 | 0.023 |
2021-01 | 0.032 | 0.017 |
2021-07 | 0.050 | 0.023 |
2022-01 | 0.036 | 0.014 |
Ephemeris comparison

Difference between NIMAv1 and JPL70 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.