(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) | 2458200.5 |
| Semi major axis | 5.250860 ± 0.000000 au |
| Eccentricity | 0.091349931 ± 0.000000076 |
| Inclination | 33.541948388 ± 0.000004301 ° |
| Longitude of ascending node | 48.546020 ± 0.000009 ° |
| Argument of perihelia | 296.056956 ± 0.000046 ° |
| Mean anomaly | 189.172754 ± 0.000054 ° |
| Orbital period | 12.03 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv1 |
| Observation file |
omc_ast_NIMAv1.txt |
| bsp file | 1208_Troilus_nima_v1.bsp |
| Date of first observation | 1931-12-31 |
| Date of last observation | 2019-01-29 |
| Number of observations used in the fit | 1948 |
| Number of rejected observations | 17 |
| Number of DES observations | 0 |
| Number of MPC observations | 1965 |
| Number of unpublished observations | 0 |
| RMS of observations | 0.543 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv1 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date | σα (arcsec) | σδ (arcsec) |
| 2018-01 | 0.016 | 0.016 |
| 2018-07 | 0.015 | 0.015 |
| 2019-01 | 0.018 | 0.019 |
| 2019-07 | 0.019 | 0.022 |
| 2020-01 | 0.023 | 0.024 |
| 2020-07 | 0.028 | 0.035 |
| 2021-01 | 0.032 | 0.028 |
| 2021-07 | 0.047 | 0.045 |
| 2022-01 | 0.047 | 0.022 |
Ephemeris comparison
Difference between NIMAv1 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.