(1208) Troilus
Object
| Object |
(1208) Troilus |
| Diameter(1) |
100 km |
| Dynamic class(1) |
trojan |
| Absolute magnitude |
9.15 |
| G slop |
0.15 |
Orbital elements
| Epoch (Julian date) |
2460800.5 |
| Semi major axis |
5.254101 ± 0.000000 au |
| Eccentricity |
0.092827551 ± 0.000000043 |
| Inclination |
33.543934482 ± 0.000005535 ° |
| Longitude of ascending node |
48.546849 ± 0.000006 ° |
| Argument of perihelia |
296.517561 ± 0.000031 ° |
| Mean anomaly |
42.012794 ± 0.000030 ° |
| Orbital period |
12.04 yr |
Ephemeris & Observations
| Ephemeris version |
NIMAv7 |
| Observation file (documentation) |
omc_ast_NIMAv7.txt |
| bsp file |
1208_Troilus_nima_v7.bsp |
| Date of first observation |
1931-12-31 |
| Date of last observation |
2025-07-13 |
| Number of observations used in the fit |
5942 |
| Number of rejected observations |
197 |
| Number of DES observations |
0 |
| Number of MPC observations |
6137 |
| Number of unpublished observations |
2 |
| RMS of observations |
2.195 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv7 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date |
σα (arcsec) |
σδ (arcsec) |
| 2024-01 |
0.023 |
0.022 |
| 2024-07 |
0.024 |
0.027 |
| 2025-01 |
0.025 |
0.029 |
| 2025-07 |
0.023 |
0.026 |
| 2026-01 |
0.028 |
0.034 |
| 2026-07 |
0.027 |
0.022 |
| 2027-01 |
0.038 |
0.031 |
| 2027-07 |
0.032 |
0.016 |
| 2028-01 |
0.045 |
0.021 |
Ephemeris comparison
Difference between NIMAv7 and JPL75 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