(1208) Troilus
Object
| Object |
(1208) Troilus |
| Diameter(1) |
100 km |
| Dynamic class(1) |
trojan |
| Absolute magnitude |
9.00 |
| G slop |
0.15 |
Orbital elements
| Epoch (Julian date) |
2459800.5 |
| Semi major axis |
5.252617 ± 0.000000 au |
| Eccentricity |
0.092684491 ± 0.000000056 |
| Inclination |
33.543437260 ± 0.000006167 ° |
| Longitude of ascending node |
48.553280 ± 0.000007 ° |
| Argument of perihelia |
295.567718 ± 0.000037 ° |
| Mean anomaly |
320.927814 ± 0.000039 ° |
| Orbital period |
12.04 yr |
Ephemeris & Observations
| Ephemeris version |
NIMAv5 |
| Observation file (documentation) |
omc_ast_NIMAv5.txt |
| bsp file |
1208_Troilus_nima_v5.bsp |
| Date of first observation |
1931-12-31 |
| Date of last observation |
2023-07-02 |
| Number of observations used in the fit |
3187 |
| Number of rejected observations |
17 |
| Number of DES observations |
0 |
| Number of MPC observations |
3202 |
| Number of unpublished observations |
2 |
| RMS of observations |
2.941 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv5 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date |
σα (arcsec) |
σδ (arcsec) |
| 2023-01 |
0.030 |
0.019 |
| 2023-07 |
0.041 |
0.039 |
| 2024-01 |
0.037 |
0.033 |
| 2024-07 |
0.037 |
0.046 |
| 2025-01 |
0.039 |
0.048 |
| 2025-07 |
0.036 |
0.042 |
| 2026-01 |
0.043 |
0.054 |
| 2026-07 |
0.039 |
0.032 |
| 2027-01 |
0.053 |
0.041 |
Ephemeris comparison
Difference between NIMAv5 and JPL65 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