(1208) Troilus
Object
| Object |
(1208) Troilus |
| Diameter(1) |
100 km |
| Dynamic class(1) |
trojan |
| Absolute magnitude |
8.99 |
| G slop |
0.15 |
Orbital elements
| Epoch (Julian date) |
2458600.5 |
| Semi major axis |
5.252322 ± 0.000000 au |
| Eccentricity |
0.091363682 ± 0.000000075 |
| Inclination |
33.540993326 ± 0.000006308 ° |
| Longitude of ascending node |
48.547237 ± 0.000007 ° |
| Argument of perihelia |
295.613145 ± 0.000059 ° |
| Mean anomaly |
222.455300 ± 0.000060 ° |
| Orbital period |
12.04 yr |
Ephemeris & Observations
| Ephemeris version |
NIMAv3 |
| Observation file (documentation) |
omc_ast_NIMAv3.txt |
| bsp file |
1208_Troilus_nima_v3.bsp |
| Date of first observation |
1931-12-31 |
| Date of last observation |
2021-01-18 |
| Number of observations used in the fit |
2716 |
| Number of rejected observations |
16 |
| Number of DES observations |
0 |
| Number of MPC observations |
2730 |
| Number of unpublished observations |
2 |
| RMS of observations |
3.185 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) |
| 2021-01 |
0.012 |
0.012 |
| 2021-07 |
0.018 |
0.020 |
| 2022-01 |
0.020 |
0.015 |
| 2022-07 |
0.040 |
0.024 |
| 2023-01 |
0.034 |
0.021 |
| 2023-07 |
0.046 |
0.043 |
| 2024-01 |
0.041 |
0.037 |
| 2024-07 |
0.041 |
0.051 |
| 2025-01 |
0.043 |
0.053 |
Ephemeris comparison
Difference between NIMAv3 and JPL56 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