(1437) Diomedes


Object

Object (1437) Diomedes
Diameter(1) 118 km
Dynamic class(1) trojan
Absolute magnitude 8.30
G slop 0.15
(1) Data from the johnston archive list.

Orbital elements

Epoch (Julian date) 2458600.5
Semi major axis 5.201523 ± 0.000000 au
Eccentricity 0.043492909 ± 0.000000055
Inclination 20.479189086 ± 0.000002686 °
Longitude of ascending node 315.791328 ± 0.000010 °
Argument of perihelia 130.129257 ± 0.000076 °
Mean anomaly 268.498330 ± 0.000081 °
Orbital period 11.86 yr

Ephemeris & Observations

Ephemeris version NIMAv3
Observation file (documentation) omc_ast_NIMAv3.txt
bsp file 1437_Diomedes_nima_v3.bsp
Date of first observation 1931-02-17
Date of last observation 2021-08-20
Number of observations used in the fit 2767
Number of rejected observations 17
Number of DES observations 0
Number of MPC observations 2777
Number of unpublished observations 7
RMS of observations 2.447 arcsec

Residuals

residual plot

Residuals in right ascension and declination compared to NIMAv3 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.

Orbit quality

date σα (arcsec) σδ (arcsec)
2021-01 0.010 0.010
2021-07 0.012 0.010
2022-01 0.019 0.016
2022-07 0.017 0.013
2023-01 0.031 0.022
2023-07 0.023 0.018
2024-01 0.036 0.031
2024-07 0.028 0.025
2025-01 0.040 0.032

Ephemeris comparison

residual plot

Difference between NIMAv3 and JPL77 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