(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| Number of unpublished observations | 8 |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.