(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 | 8.60 |
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 |
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Number of unpublished observations | 4 |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
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
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.