(5638) Deikoon
Object
| Object |
(5638) Deikoon |
| Diameter(1) |
47 km |
| Dynamic class(1) |
trojan |
| Absolute magnitude |
10.61 |
| G slop |
0.15 |
Orbital elements
| Epoch (Julian date) |
2460800.5 |
| Semi major axis |
5.230335 ± 0.000000 au |
| Eccentricity |
0.105876898 ± 0.000000015 |
| Inclination |
10.920455217 ± 0.000000400 ° |
| Longitude of ascending node |
156.033321 ± 0.000005 ° |
| Argument of perihelia |
92.452429 ± 0.000008 ° |
| Mean anomaly |
113.581143 ± 0.000005 ° |
| Orbital period |
11.96 yr |
Ephemeris & Observations
| Ephemeris version |
NIMAv9 |
| Observation file (documentation) |
omc_ast_NIMAv9.txt |
| bsp file |
5638_Deikoon_nima_v9.bsp |
| Date of first observation |
1988-08-18 |
| Date of last observation |
2025-07-07 |
| Number of observations used in the fit |
4420 |
| Number of rejected observations |
70 |
| Number of DES observations |
10 |
| Number of MPC observations |
4126 |
| Number of unpublished observations |
76 |
| RMS of observations |
0.117 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv9 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date |
σα (arcsec) |
σδ (arcsec) |
| 2024-01 |
0.015 |
0.004 |
| 2024-07 |
0.019 |
0.006 |
| 2025-01 |
0.017 |
0.005 |
| 2025-07 |
0.018 |
0.005 |
| 2026-01 |
0.019 |
0.005 |
| 2026-07 |
0.018 |
0.004 |
| 2027-01 |
0.022 |
0.005 |
| 2027-07 |
0.017 |
0.003 |
| 2028-01 |
0.024 |
0.003 |
Ephemeris comparison
Difference between NIMAv9 and JPL58 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.
Previous NIMA versions