(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 | 5.181757 ± 0.000000 au |
| Eccentricity | 0.122676242 ± 0.000000013 |
| Inclination | 8.915388049 ± 0.000002296 ° |
| Longitude of ascending node | 301.562984 ± 0.000002 ° |
| Argument of perihelia | 335.474083 ± 0.000025 ° |
| Mean anomaly | 291.306208 ± 0.000031 ° |
| Orbital period | 11.80 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv2 |
| Observation file |
omc_ast_NIMAv2.txt |
| bsp file | 884_Priamus_nima_v2.bsp |
| Date of first observation | 1917-09-22 |
| Date of last observation | 2019-08-01 |
| Number of observations used in the fit | 2508 |
| Number of rejected observations | 37 |
| Number of DES observations | 0 |
| Number of MPC observations | 2478 |
| Number of unpublished observations | 0 |
| RMS of observations | 0.101 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 | 0.021 | 0.009 |
| 2019-07 | 0.022 | 0.011 |
| 2020-01 | 0.031 | 0.008 |
| 2020-07 | 0.043 | 0.012 |
| 2021-01 | 0.039 | 0.002 |
| 2021-07 | 0.063 | 0.010 |
| 2022-01 | 0.040 | 0.013 |
| 2022-07 | 0.052 | 0.026 |
| 2023-01 | 0.036 | 0.018 |
Ephemeris comparison
Difference between NIMAv2 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.