(1437) Diomedes


This object has a more recent orbit available here

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 0.043492837 ± 0.000000011
Inclination 20.479190642 ± 0.000001805 °
Longitude of ascending node 315.791331 ± 0.000003 °
Argument of perihelia 130.128583 ± 0.000053 °
Mean anomaly 268.499079 ± 0.000059 °
Orbital period 11.86 yr

Ephemeris & Observations

Ephemeris version NIMAv2
Observation file (documentation) omc_ast_NIMAv2.txt
bsp file 1437_Diomedes_nima_v2.bsp
Date of first observation 1931-02-17
Date of last observation 2019-08-14
Number of observations used in the fit 2203
Number of rejected observations 21
Number of DES observations 0
Number of MPC observations 1966
Number of unpublished observations 0
RMS of observations 0.122 arcsec

Residuals

residual plot

Residuals in right ascension and declination compared to NIMAv2 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.

Orbit quality

date σα (arcsec) σδ (arcsec)
2019-01 0.007 0.007
2019-07 0.014 0.011
2020-01 0.013 0.012
2020-07 0.020 0.010
2021-01 0.023 0.014
2021-07 0.025 0.002
2022-01 0.036 0.002
2022-07 0.025 0.008
2023-01 0.034 0.019

Ephemeris comparison

residual plot

Difference between NIMAv2 and JPL60 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.