(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 | 7.39 |
| G slop | 0.15 |
(1) Data from the johnston archive list.
Orbital elements
| Epoch (Julian date) | 2460600.5 |
| Semi major axis | 5.274477 ± 0.000000 au |
| Eccentricity | 0.023910680 ± 0.000000014 |
| Inclination | 18.151290272 ± 0.000000479 ° |
| Longitude of ascending node | 342.801475 ± 0.000003 ° |
| Argument of perihelia | 179.748714 ± 0.000020 ° |
| Mean anomaly | 337.578342 ± 0.000020 ° |
| Orbital period | 12.11 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv8 |
| Observation file |
omc_ast_NIMAv8.txt |
| bsp file | 624_Hektor_nima_v8.bsp |
| Date of first observation | 1907-02-11 |
| Date of last observation | 2024-05-30 |
| Number of observations used in the fit | 5778 |
| Number of rejected observations | 68 |
| Number of DES observations | 0 |
| Number of MPC observations | 5824 |
| Number of unpublished observations | 22 |
| RMS of observations | 5.033 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv8 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date | σα (arcsec) | σδ (arcsec) |
| 2024-01 | 0.003 | 0.002 |
| 2024-07 | 0.003 | 0.002 |
| 2025-01 | 0.005 | 0.005 |
| 2025-07 | 0.005 | 0.004 |
| 2026-01 | 0.007 | 0.006 |
| 2026-07 | 0.007 | 0.006 |
| 2027-01 | 0.009 | 0.006 |
| 2027-07 | 0.010 | 0.008 |
| 2028-01 | 0.011 | 0.003 |
Ephemeris comparison
Difference between NIMAv8 and JPL130 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.