(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 ± 0.000000007
Inclination 18.162464509 ± 0.000000095 °
Longitude of ascending node 342.793764 ± 0.000001 °
Argument of perihelia 185.152955 ± 0.000014 °
Mean anomaly 168.887639 ± 0.000014 °
Orbital period 12.06 yr

Ephemeris & Observations

Ephemeris version NIMAv7
Observation file (documentation) omc_ast_NIMAv7.txt
bsp file 624_Hektor_nima_v7.bsp
Date of first observation 1907-02-11
Date of last observation 2023-04-22
Number of observations used in the fit 5492
Number of rejected observations 65
Number of DES observations 0
Number of MPC observations 5208
Number of unpublished observations 10
RMS of observations 0.129 arcsec

Residuals

residual plot

Residuals in right ascension and declination compared to NIMAv7 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.

Orbit quality

date σα (arcsec) σδ (arcsec)
2023-01 0.004 0.001
2023-07 0.003 0.001
2024-01 0.005 0.003
2024-07 0.004 0.002
2025-01 0.006 0.005
2025-07 0.005 0.004
2026-01 0.007 0.006
2026-07 0.006 0.006
2027-01 0.008 0.005

Ephemeris comparison

residual plot

Difference between NIMAv7 and JPL124 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.