(4709) Ennomos


Object

Object (4709) Ennomos
Diameter(1) 90 km
Dynamic class(1) trojan
Absolute magnitude 8.60
G slop 0.15
(1) Data from the johnston archive list.

Orbital elements

Epoch (Julian date) 2458200.5
Semi major axis 5.244340 ± 0.000000 au
Eccentricity 0.020939950 ± 0.000000024
Inclination 25.451508454 ± 0.000001246 °
Longitude of ascending node 253.122926 ± 0.000002 °
Argument of perihelia 86.214735 ± 0.000059 °
Mean anomaly 204.598211 ± 0.000061 °
Orbital period 12.01 yr

Ephemeris & Observations

Ephemeris version NIMAv4
Observation file (documentation) omc_ast_NIMAv4.txt
bsp file 4709_Ennomos_nima_v4.bsp
Date of first observation 1951-08-05
Date of last observation 2020-10-09
Number of observations used in the fit 3108
Number of rejected observations 25
Number of DES observations 34
Number of MPC observations 2986
Number of unpublished observations 4
RMS of observations 0.107 arcsec

Residuals

residual plot

Residuals in right ascension and declination compared to NIMAv4 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.

Orbit quality

date σα (arcsec) σδ (arcsec)
2021-01 0.008 0.004
2021-07 0.015 0.008
2022-01 0.013 0.007
2022-07 0.022 0.012
2023-01 0.018 0.009
2023-07 0.028 0.011
2024-01 0.025 0.010
2024-07 0.031 0.006
2025-01 0.033 0.007

Ephemeris comparison

residual plot

Difference between NIMAv4 and JPL71 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