(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 | 0.023280446 ± 0.000000044 |
| Inclination | 18.162467398 ± 0.000003875 ° |
| Longitude of ascending node | 342.793770 ± 0.000008 ° |
| Argument of perihelia | 185.152968 ± 0.000076 ° |
| Mean anomaly | 168.887621 ± 0.000079 ° |
| Orbital period | 12.06 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv6 |
| Observation file |
omc_ast_NIMAv6.txt |
| bsp file | 624_Hektor_nima_v6.bsp |
| Date of first observation | 1907-02-11 |
| Date of last observation | 2022-07-14 |
| Number of observations used in the fit | 3618 |
| Number of rejected observations | 40 |
| Number of DES observations | 0 |
| Number of MPC observations | 3650 |
| Number of unpublished observations | 8 |
| RMS of observations | 6.355 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv6 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date | σα (arcsec) | σδ (arcsec) |
| 2022-01 | 0.014 | 0.014 |
| 2022-07 | 0.014 | 0.012 |
| 2023-01 | 0.021 | 0.017 |
| 2023-07 | 0.017 | 0.013 |
| 2024-01 | 0.026 | 0.020 |
| 2024-07 | 0.019 | 0.014 |
| 2025-01 | 0.028 | 0.024 |
| 2025-07 | 0.022 | 0.019 |
| 2026-01 | 0.029 | 0.025 |
Ephemeris comparison
Difference between NIMAv6 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.