(1208) Troilus
This object has a more recent orbit available here
Object
| Object | (1208) Troilus |
| Diameter(1) | 100 km |
| Dynamic class(1) | trojan |
| Absolute magnitude | 9.17 |
| G slop | 0.15 |
(1) Data from the johnston archive list.
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 |
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| Number of unpublished observations | 2 |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.