(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 | 0.122676242 ± 0.000000062 |
| Inclination | 8.915378702 ± 0.000003312 ° |
| Longitude of ascending node | 301.563018 ± 0.000038 ° |
| Argument of perihelia | 335.474080 ± 0.000036 ° |
| Mean anomaly | 291.306155 ± 0.000048 ° |
| Orbital period | 11.80 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv4 |
| Observation file |
omc_ast_NIMAv4.txt |
| bsp file | 884_Priamus_nima_v4.bsp |
| Date of first observation | 1917-09-22 |
| Date of last observation | 2020-08-06 |
| Number of observations used in the fit | 2738 |
| Number of rejected observations | 49 |
| Number of DES observations | 0 |
| Number of MPC observations | 2785 |
| Number of unpublished observations | 2 |
| RMS of observations | 0.514 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) |
| 2020-01 | 0.018 | 0.012 |
| 2020-07 | 0.027 | 0.021 |
| 2021-01 | 0.032 | 0.018 |
| 2021-07 | 0.058 | 0.031 |
| 2022-01 | 0.042 | 0.023 |
| 2022-07 | 0.066 | 0.040 |
| 2023-01 | 0.048 | 0.028 |
| 2023-07 | 0.057 | 0.033 |
| 2024-01 | 0.051 | 0.029 |
Ephemeris comparison
Difference between NIMAv4 and JPL32 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.