(1208) Troilus
Object
| Object |
(1208) Troilus |
| Diameter(1) |
100 km |
| Dynamic class(1) |
trojan |
| Absolute magnitude |
9.17 |
| G slop |
0.15 |
Orbital elements
| Epoch (Julian date) |
2460600.5 |
| Semi major axis |
5.253420 ± 0.000000 au |
| Eccentricity |
0.092918304 ± 0.000000052 |
| Inclination |
33.544793745 ± 0.000005772 ° |
| Longitude of ascending node |
48.546177 ± 0.000007 ° |
| Argument of perihelia |
296.300438 ± 0.000033 ° |
| Mean anomaly |
25.824761 ± 0.000034 ° |
| Orbital period |
12.04 yr |
Ephemeris & Observations
| Ephemeris version |
NIMAv6 |
| Observation file (documentation) |
omc_ast_NIMAv6.txt |
| bsp file |
1208_Troilus_nima_v6.bsp |
| Date of first observation |
1931-12-31 |
| Date of last observation |
2024-07-12 |
| Number of observations used in the fit |
5346 |
| Number of rejected observations |
196 |
| Number of DES observations |
0 |
| Number of MPC observations |
5540 |
| Number of unpublished observations |
2 |
| RMS of observations |
2.314 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv6 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date |
σα (arcsec) |
σδ (arcsec) |
| 2024-01 |
0.030 |
0.028 |
| 2024-07 |
0.031 |
0.037 |
| 2025-01 |
0.033 |
0.040 |
| 2025-07 |
0.031 |
0.035 |
| 2026-01 |
0.037 |
0.046 |
| 2026-07 |
0.035 |
0.028 |
| 2027-01 |
0.048 |
0.037 |
| 2027-07 |
0.039 |
0.018 |
| 2028-01 |
0.053 |
0.022 |
Ephemeris comparison
Difference between NIMAv6 and JPL70 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