(884) Priamus
Object
| Object |
(884) Priamus |
| Diameter(1) |
101 km |
| Dynamic class(1) |
trojan |
| Absolute magnitude |
8.74 |
| G slop |
0.15 |
Orbital elements
| Epoch (Julian date) |
2460800.5 |
| Semi major axis |
5.208930 ± 0.000000 au |
| Eccentricity |
0.124046955 ± 0.000000027 |
| Inclination |
8.895745921 ± 0.000001952 ° |
| Longitude of ascending node |
301.442384 ± 0.000011 ° |
| Argument of perihelia |
337.544495 ± 0.000020 ° |
| Mean anomaly |
112.964655 ± 0.000012 ° |
| Orbital period |
11.89 yr |
Ephemeris & Observations
| Ephemeris version |
NIMAv9 |
| Observation file (documentation) |
omc_ast_NIMAv9.txt |
| bsp file |
884_Priamus_nima_v9.bsp |
| Date of first observation |
1917-09-22 |
| Date of last observation |
2025-07-10 |
| Number of observations used in the fit |
5399 |
| Number of rejected observations |
39 |
| Number of DES observations |
0 |
| Number of MPC observations |
5433 |
| Number of unpublished observations |
5 |
| RMS of observations |
3.056 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv9 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date |
σα (arcsec) |
σδ (arcsec) |
| 2024-01 |
0.018 |
0.012 |
| 2024-07 |
0.023 |
0.011 |
| 2025-01 |
0.025 |
0.013 |
| 2025-07 |
0.025 |
0.007 |
| 2026-01 |
0.031 |
0.009 |
| 2026-07 |
0.024 |
0.005 |
| 2027-01 |
0.033 |
0.007 |
| 2027-07 |
0.023 |
0.007 |
| 2028-01 |
0.030 |
0.012 |
Ephemeris comparison
Difference between NIMAv9 and JPL69 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.
Previous NIMA versions