(624) Hektor
This object has a more recent orbit available here
Object
Object | (624) Hektor |
Diameter(1) | 225 km |
Dynamic class(1) | trojan |
Absolute magnitude | 7.30 |
G slop | 0.15 |
(1) Data from the johnston archive list.
Orbital elements
Epoch (Julian date) | 2458600.5 |
Semi major axis | 5.259580 ± 0.000000 au |
Eccentricity | 0.023280579 ± 0.000000070 |
Inclination | 18.162462714 ± 0.000004221 ° |
Longitude of ascending node | 342.793741 ± 0.000012 ° |
Argument of perihelia | 185.153086 ± 0.000099 ° |
Mean anomaly | 168.887542 ± 0.000105 ° |
Orbital period | 12.06 yr |
Ephemeris & Observations
Ephemeris version | NIMAv1 |
Observation file |
omc_ast_NIMAv1.txt |
bsp file | 624_Hektor_nima_v1.bsp |
Date of first observation | 1907-02-11 |
Date of last observation | 2018-12-30 |
Number of observations used in the fit | 2852 |
Number of rejected observations | 76 |
Number of DES observations | 0 |
Number of MPC observations | 2928 |
Number of unpublished observations | 0 |
RMS of observations | 0.804 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 | 0.014 | 0.012 |
2018-07 | 0.017 | 0.017 |
2019-01 | 0.013 | 0.012 |
2019-07 | 0.017 | 0.016 |
2020-01 | 0.015 | 0.014 |
2020-07 | 0.019 | 0.016 |
2021-01 | 0.019 | 0.018 |
2021-07 | 0.022 | 0.016 |
2022-01 | 0.027 | 0.021 |
Ephemeris comparison

Difference between NIMAv1 and JPL89 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.