(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 | 10.57 |
| G slop | 0.15 |
(1) Data from the johnston archive list.
Orbital elements
| Epoch (Julian date) | 2456972.606408625 |
| Semi major axis | 5.258362 ± 0.000000 au |
| Eccentricity | 0.105405158 ± 0.000000016 |
| Inclination | 10.905329435 ± 0.000000400 ° |
| Longitude of ascending node | 156.030922 ± 0.000005 ° |
| Argument of perihelia | 91.664462 ± 0.000009 ° |
| Mean anomaly | 159.893223 ± 0.000009 ° |
| Orbital period | 12.06 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv7 |
| Observation file |
omc_ast_NIMAv7.txt |
| bsp file | 5638_Deikoon_nima_v7.bsp |
| Date of first observation | 1988-08-18 |
| Date of last observation | 2023-08-12 |
| Number of observations used in the fit | 3603 |
| Number of rejected observations | 70 |
| Number of DES observations | 10 |
| Number of MPC observations | 3309 |
| Number of unpublished observations | 76 |
| RMS of observations | 0.117 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv7 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date | σα (arcsec) | σδ (arcsec) |
| 2023-01 | 0.014 | 0.002 |
| 2023-07 | 0.022 | 0.005 |
| 2024-01 | 0.017 | 0.004 |
| 2024-07 | 0.021 | 0.006 |
| 2025-01 | 0.019 | 0.005 |
| 2025-07 | 0.020 | 0.006 |
| 2026-01 | 0.021 | 0.006 |
| 2026-07 | 0.019 | 0.004 |
| 2027-01 | 0.024 | 0.005 |
Ephemeris comparison
Difference between NIMAv7 and JPL46 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.