(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 | 0.021839106 ± 0.000000014 |
Inclination | 25.453147156 ± 0.000000208 ° |
Longitude of ascending node | 253.154442 ± 0.000001 ° |
Argument of perihelia | 88.930989 ± 0.000018 ° |
Mean anomaly | 146.081136 ± 0.000019 ° |
Orbital period | 11.99 yr |
Ephemeris & Observations
Ephemeris version | NIMAv6 |
Observation file |
omc_ast_NIMAv6.txt |
bsp file | 4709_Ennomos_nima_v6.bsp |
Date of first observation | 1951-08-05 |
Date of last observation | 2023-07-04 |
Number of observations used in the fit | 4190 |
Number of rejected observations | 46 |
Number of DES observations | 34 |
Number of MPC observations | 3930 |
Number of unpublished observations | 19 |
RMS of observations | 0.110 arcsec |
Residuals

Residuals in right ascension and declination compared to NIMAv6 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
date | σα (arcsec) | σδ (arcsec) |
2023-01 | 0.006 | 0.003 |
2023-07 | 0.010 | 0.004 |
2024-01 | 0.009 | 0.004 |
2024-07 | 0.013 | 0.002 |
2025-01 | 0.014 | 0.003 |
2025-07 | 0.015 | 0.002 |
2026-01 | 0.020 | 0.003 |
2026-07 | 0.015 | 0.006 |
2027-01 | 0.022 | 0.009 |
Ephemeris comparison

Difference between NIMAv6 and JPL83 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.