(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 | 8.99 |
| G slop | 0.15 |
(1) Data from the johnston archive list.
Orbital elements
| Epoch (Julian date) | 2458600.5 |
| Semi major axis | 5.252322 ± 0.000001 au |
| Eccentricity | 0.091363730 ± 0.000000100 |
| Inclination | 33.540995950 ± 0.000006525 ° |
| Longitude of ascending node | 48.547234 ± 0.000011 ° |
| Argument of perihelia | 295.613172 ± 0.000063 ° |
| Mean anomaly | 222.455271 ± 0.000069 ° |
| Orbital period | 12.04 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv2 |
| Observation file |
omc_ast_NIMAv2.txt |
| bsp file | 1208_Troilus_nima_v2.bsp |
| Date of first observation | 1931-12-31 |
| Date of last observation | 2019-08-01 |
| Number of observations used in the fit | 2279 |
| Number of rejected observations | 16 |
| Number of DES observations | 0 |
| Number of MPC observations | 2295 |
| Number of unpublished observations | 0 |
| RMS of observations | 0.505 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv2 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date | σα (arcsec) | σδ (arcsec) |
| 2019-01 | 0.020 | 0.021 |
| 2019-07 | 0.022 | 0.024 |
| 2020-01 | 0.025 | 0.027 |
| 2020-07 | 0.032 | 0.039 |
| 2021-01 | 0.037 | 0.033 |
| 2021-07 | 0.055 | 0.053 |
| 2022-01 | 0.055 | 0.029 |
| 2022-07 | 0.093 | 0.032 |
| 2023-01 | 0.069 | 0.026 |
Ephemeris comparison
Difference between NIMAv2 and JPL41 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.