(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 | 9.00 |
| G slop | 0.15 |
(1) Data from the johnston archive list.
Orbital elements
| Epoch (Julian date) | 2459800.5 |
| Semi major axis | 5.252617 ± 0.000000 au |
| Eccentricity | 0.092684495 ± 0.000000058 |
| Inclination | 33.543438907 ± 0.000006437 ° |
| Longitude of ascending node | 48.553281 ± 0.000007 ° |
| Argument of perihelia | 295.567714 ± 0.000040 ° |
| Mean anomaly | 320.927819 ± 0.000043 ° |
| Orbital period | 12.04 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv4 |
| Observation file |
omc_ast_NIMAv4.txt |
| bsp file | 1208_Troilus_nima_v4.bsp |
| Date of first observation | 1931-12-31 |
| Date of last observation | 2022-04-15 |
| Number of observations used in the fit | 2846 |
| Number of rejected observations | 17 |
| Number of DES observations | 0 |
| Number of MPC observations | 2861 |
| Number of unpublished observations | 2 |
| RMS of observations | 3.112 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv4 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date | σα (arcsec) | σδ (arcsec) |
| 2022-01 | 0.019 | 0.015 |
| 2022-07 | 0.040 | 0.024 |
| 2023-01 | 0.034 | 0.020 |
| 2023-07 | 0.046 | 0.043 |
| 2024-01 | 0.041 | 0.036 |
| 2024-07 | 0.041 | 0.050 |
| 2025-01 | 0.043 | 0.053 |
| 2025-07 | 0.039 | 0.045 |
| 2026-01 | 0.046 | 0.058 |
Ephemeris comparison
Difference between NIMAv4 and JPL59 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.