(5638) Deikoon
This object has a more recent orbit available here
Object
| Object | (5638) Deikoon |
| Diameter(1) | 47 km |
| Dynamic class(1) | trojan |
| Absolute magnitude | 10.50 |
| G slop | 0.15 |
(1) Data from the johnston archive list.
Orbital elements
| Epoch (Julian date) | 2458200.5 |
| Semi major axis | 5.248985 ± 0.000001 au |
| Eccentricity | 0.107235527 ± 0.000000067 |
| Inclination | 10.908382292 ± 0.000007568 ° |
| Longitude of ascending node | 156.019725 ± 0.000013 ° |
| Argument of perihelia | 91.816615 ± 0.000077 ° |
| Mean anomaly | 260.334577 ± 0.000077 ° |
| Orbital period | 12.03 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv4 |
| Observation file |
omc_ast_NIMAv4.txt |
| bsp file | 5638_Deikoon_nima_v4.bsp |
| Date of first observation | 1988-08-18 |
| Date of last observation | 2019-02-23 |
| Number of observations used in the fit | 1458 |
| Number of rejected observations | 0 |
| Number of DES observations | 10 |
| Number of MPC observations | 1447 |
| Number of unpublished observations | 1 |
| RMS of observations | 0.527 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) |
| 2020-01 | 0.024 | 0.016 |
| 2020-07 | 0.031 | 0.023 |
| 2021-01 | 0.043 | 0.025 |
| 2021-07 | 0.065 | 0.036 |
| 2022-01 | 0.054 | 0.025 |
| 2022-07 | 0.086 | 0.033 |
| 2023-01 | 0.056 | 0.018 |
| 2023-07 | 0.074 | 0.021 |
| 2024-01 | 0.053 | 0.012 |
Ephemeris comparison
Difference between NIMAv4 and JPL21 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.