(884) Priamus
This object has a more recent orbit available here
Object
| Object | (884) Priamus |
| Diameter(1) | 101 km |
| Dynamic class(1) | trojan |
| Absolute magnitude | 8.81 |
| G slop | 0.15 |
(1) Data from the johnston archive list.
Orbital elements
| Epoch (Julian date) | 2458600.5 |
| Semi major axis | 5.181758 ± 0.000000 au |
| Eccentricity | 0.122676259 ± 0.000000042 |
| Inclination | 8.915379055 ± 0.000002018 ° |
| Longitude of ascending node | 301.563004 ± 0.000012 ° |
| Argument of perihelia | 335.474088 ± 0.000025 ° |
| Mean anomaly | 291.306163 ± 0.000017 ° |
| Orbital period | 11.80 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv5 |
| Observation file |
omc_ast_NIMAv5.txt |
| bsp file | 884_Priamus_nima_v5.bsp |
| Date of first observation | 1917-09-22 |
| Date of last observation | 2021-07-27 |
| Number of observations used in the fit | 2793 |
| Number of rejected observations | 31 |
| Number of DES observations | 0 |
| Number of MPC observations | 2819 |
| Number of unpublished observations | 5 |
| RMS of observations | 4.241 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv5 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date | σα (arcsec) | σδ (arcsec) |
| 2021-01 | 0.005 | 0.005 |
| 2021-07 | 0.007 | 0.007 |
| 2022-01 | 0.008 | 0.005 |
| 2022-07 | 0.020 | 0.012 |
| 2023-01 | 0.017 | 0.011 |
| 2023-07 | 0.030 | 0.018 |
| 2024-01 | 0.028 | 0.017 |
| 2024-07 | 0.036 | 0.016 |
| 2025-01 | 0.039 | 0.018 |
Ephemeris comparison
Difference between NIMAv5 and JPL45 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.