(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 | 10.62 |
| G slop | 0.15 |
(1) Data from the johnston archive list.
Orbital elements
| Epoch (Julian date) | 2460600.5 |
| Semi major axis | 5.232546 ± 0.000000 au |
| Eccentricity | 0.105815461 ± 0.000000016 |
| Inclination | 10.919109066 ± 0.000000401 ° |
| Longitude of ascending node | 156.029493 ± 0.000005 ° |
| Argument of perihelia | 92.688189 ± 0.000008 ° |
| Mean anomaly | 96.862458 ± 0.000005 ° |
| Orbital period | 11.97 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv8 |
| Observation file |
omc_ast_NIMAv8.txt |
| bsp file | 5638_Deikoon_nima_v8.bsp |
| Date of first observation | 1988-08-18 |
| Date of last observation | 2024-07-12 |
| Number of observations used in the fit | 3969 |
| Number of rejected observations | 70 |
| Number of DES observations | 10 |
| Number of MPC observations | 3675 |
| Number of unpublished observations | 76 |
| RMS of observations | 0.117 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv8 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date | σα (arcsec) | σδ (arcsec) |
| 2024-01 | 0.016 | 0.004 |
| 2024-07 | 0.020 | 0.006 |
| 2025-01 | 0.019 | 0.005 |
| 2025-07 | 0.019 | 0.006 |
| 2026-01 | 0.021 | 0.006 |
| 2026-07 | 0.019 | 0.004 |
| 2027-01 | 0.023 | 0.005 |
| 2027-07 | 0.018 | 0.003 |
| 2028-01 | 0.025 | 0.004 |
Ephemeris comparison
Difference between NIMAv8 and JPL53 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.