(4709) Ennomos


This object has a more recent orbit available here

Object

Object (4709) Ennomos
Diameter(1) 90 km
Dynamic class(1) trojan
Absolute magnitude 8.75
G slop 0.15
(1) Data from the johnston archive list.

Orbital elements

Epoch (Julian date) 2457522.919469434
Semi major axis 5.239933 ± 0.000000 au
Eccentricity 0.021839065 ± 0.000000043
Inclination 25.453147768 ± 0.000001599 °
Longitude of ascending node 253.154441 ± 0.000005 °
Argument of perihelia 88.930964 ± 0.000052 °
Mean anomaly 146.081161 ± 0.000053 °
Orbital period 11.99 yr

Ephemeris & Observations

Ephemeris version NIMAv5
Observation file (documentation) omc_ast_NIMAv5.txt
bsp file 4709_Ennomos_nima_v5.bsp
Date of first observation 1951-08-05
Date of last observation 2022-08-03
Number of observations used in the fit 3478
Number of rejected observations 29
Number of DES observations 34
Number of MPC observations 3454
Number of unpublished observations 19
RMS of observations 0.456 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)
2022-01 0.006 0.006
2022-07 0.009 0.008
2023-01 0.007 0.006
2023-07 0.015 0.008
2024-01 0.015 0.007
2024-07 0.024 0.006
2025-01 0.027 0.008
2025-07 0.029 0.007
2026-01 0.038 0.010

Ephemeris comparison

residual plot

Difference between NIMAv5 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.