(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 (documentation) 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Number of unpublished observations 8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

residual plot

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

residual plot

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.