(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 | 0.020939964 ± 0.000000043 |
Inclination | 25.451507924 ± 0.000001590 ° |
Longitude of ascending node | 253.122925 ± 0.000003 ° |
Argument of perihelia | 86.214777 ± 0.000119 ° |
Mean anomaly | 204.598166 ± 0.000122 ° |
Orbital period | 12.01 yr |
Ephemeris & Observations
Ephemeris version | NIMAv3 |
Observation file |
omc_ast_NIMAv3.txt |
bsp file | 4709_Ennomos_nima_v3.bsp |
Date of first observation | 1951-08-05 |
Date of last observation | 2018-07-10 |
Number of observations used in the fit | 1815 |
Number of rejected observations | 8 |
Number of DES observations | 34 |
Number of MPC observations | 1679 |
Number of unpublished observations | 1 |
RMS of observations | 0.107 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv3 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
date | σα (arcsec) | σδ (arcsec) |
2018-01 | 0.008 | 0.007 |
2018-07 | 0.009 | 0.007 |
2019-01 | 0.014 | 0.006 |
2019-07 | 0.018 | 0.007 |
2020-01 | 0.021 | 0.007 |
2020-07 | 0.032 | 0.011 |
2021-01 | 0.027 | 0.012 |
2021-07 | 0.044 | 0.023 |
2022-01 | 0.034 | 0.018 |
Ephemeris comparison
Difference between NIMAv3 and JPL58 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.