(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 ± 0.000000 au |
| Eccentricity | 0.107235513 ± 0.000000020 |
| Inclination | 10.908381749 ± 0.000001773 ° |
| Longitude of ascending node | 156.019727 ± 0.000016 ° |
| Argument of perihelia | 91.816618 ± 0.000033 ° |
| Mean anomaly | 260.334570 ± 0.000025 ° |
| Orbital period | 12.03 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv3 |
| Observation file |
omc_ast_NIMAv3.txt |
| bsp file | 5638_Deikoon_nima_v3.bsp |
| Date of first observation | 1988-08-18 |
| Date of last observation | 2019-02-12 |
| Number of observations used in the fit | 1723 |
| Number of rejected observations | 3 |
| Number of DES observations | 10 |
| Number of MPC observations | 1447 |
| Number of unpublished observations | 0 |
| RMS of observations | 0.091 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 | 0.017 | 0.002 |
| 2018-07 | 0.015 | 0.001 |
| 2019-01 | 0.031 | 0.007 |
| 2019-07 | 0.029 | 0.005 |
| 2020-01 | 0.044 | 0.011 |
| 2020-07 | 0.049 | 0.011 |
| 2021-01 | 0.052 | 0.010 |
| 2021-07 | 0.072 | 0.013 |
| 2022-01 | 0.054 | 0.005 |
Ephemeris comparison
Difference between NIMAv3 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.