(624) Hektor
Object
| Object |
(624) Hektor |
| Diameter(1) |
225 km |
| Dynamic class(1) |
trojan |
| Absolute magnitude |
7.37 |
| G slop |
0.15 |
Orbital elements
| Epoch (Julian date) |
2460800.5 |
| Semi major axis |
5.275525 ± 0.000000 au |
| Eccentricity |
0.024154745 ± 0.000000014 |
| Inclination |
18.149498601 ± 0.000000479 ° |
| Longitude of ascending node |
342.803202 ± 0.000003 ° |
| Argument of perihelia |
180.178721 ± 0.000020 ° |
| Mean anomaly |
353.444201 ± 0.000020 ° |
| Orbital period |
12.12 yr |
Ephemeris & Observations
| Ephemeris version |
NIMAv9 |
| Observation file (documentation) |
omc_ast_NIMAv9.txt |
| bsp file |
624_Hektor_nima_v9.bsp |
| Date of first observation |
1907-02-11 |
| Date of last observation |
2025-07-02 |
| Number of observations used in the fit |
6609 |
| Number of rejected observations |
68 |
| Number of DES observations |
0 |
| Number of MPC observations |
6655 |
| Number of unpublished observations |
22 |
| RMS of observations |
4.706 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv9 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 NIMAv9 and JPL136 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.
Previous NIMA versions