(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 | 0.023280396 ± 0.000000053 |
Inclination | 18.162464731 ± 0.000003094 ° |
Longitude of ascending node | 342.793765 ± 0.000004 ° |
Argument of perihelia | 185.152978 ± 0.000078 ° |
Mean anomaly | 168.887614 ± 0.000083 ° |
Orbital period | 12.06 yr |
Ephemeris & Observations
Ephemeris version | NIMAv5 |
Observation file |
omc_ast_NIMAv5.txt |
bsp file | 624_Hektor_nima_v5.bsp |
Date of first observation | 1907-02-11 |
Date of last observation | 2020-11-16 |
Number of observations used in the fit | 2715 |
Number of rejected observations | 35 |
Number of DES observations | 0 |
Number of MPC observations | 2742 |
Number of unpublished observations | 8 |
RMS of observations | 7.335 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv5 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
date | σα (arcsec) | σδ (arcsec) |
2021-01 | 0.007 | 0.007 |
2021-07 | 0.009 | 0.008 |
2022-01 | 0.012 | 0.012 |
2022-07 | 0.012 | 0.010 |
2023-01 | 0.019 | 0.015 |
2023-07 | 0.016 | 0.010 |
2024-01 | 0.026 | 0.017 |
2024-07 | 0.019 | 0.013 |
2025-01 | 0.027 | 0.022 |
Ephemeris comparison
Difference between NIMAv5 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.