(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 | 0.105405159 ± 0.000000017 |
| Inclination | 10.905329477 ± 0.000000400 ° |
| Longitude of ascending node | 156.030921 ± 0.000005 ° |
| Argument of perihelia | 91.664463 ± 0.000009 ° |
| Mean anomaly | 159.893223 ± 0.000009 ° |
| Orbital period | 12.06 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv6 |
| Observation file |
omc_ast_NIMAv6.txt |
| bsp file | 5638_Deikoon_nima_v6.bsp |
| Date of first observation | 1988-08-18 |
| Date of last observation | 2022-06-30 |
| Number of observations used in the fit | 2780 |
| Number of rejected observations | 9 |
| Number of DES observations | 10 |
| Number of MPC observations | 2438 |
| Number of unpublished observations | 63 |
| RMS of observations | 0.117 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) |
| 2022-01 | 0.010 | 0.002 |
| 2022-07 | 0.019 | 0.002 |
| 2023-01 | 0.014 | 0.002 |
| 2023-07 | 0.023 | 0.005 |
| 2024-01 | 0.018 | 0.004 |
| 2024-07 | 0.022 | 0.006 |
| 2025-01 | 0.020 | 0.005 |
| 2025-07 | 0.021 | 0.006 |
| 2026-01 | 0.022 | 0.006 |
Ephemeris comparison
Difference between NIMAv6 and JPL41 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.