(884) Priamus
Object
| Object |
(884) Priamus |
| Diameter(1) |
101 km |
| Dynamic class(1) |
trojan |
| Absolute magnitude |
8.73 |
| G slop |
0.15 |
Orbital elements
| Epoch (Julian date) |
2459800.5 |
| Semi major axis |
5.195633 ± 0.000000 au |
| Eccentricity |
0.125237455 ± 0.000000034 |
| Inclination |
8.908725762 ± 0.000001996 ° |
| Longitude of ascending node |
301.563601 ± 0.000011 ° |
| Argument of perihelia |
336.184388 ± 0.000024 ° |
| Mean anomaly |
30.932890 ± 0.000016 ° |
| Orbital period |
11.84 yr |
Ephemeris & Observations
| Ephemeris version |
NIMAv7 |
| Observation file (documentation) |
omc_ast_NIMAv7.txt |
| bsp file |
884_Priamus_nima_v7.bsp |
| Date of first observation |
1917-09-22 |
| Date of last observation |
2023-07-04 |
| Number of observations used in the fit |
4091 |
| Number of rejected observations |
40 |
| Number of DES observations |
0 |
| Number of MPC observations |
4126 |
| Number of unpublished observations |
5 |
| RMS of observations |
3.509 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv7 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date |
σα (arcsec) |
σδ (arcsec) |
| 2023-01 |
0.016 |
0.010 |
| 2023-07 |
0.027 |
0.016 |
| 2024-01 |
0.026 |
0.016 |
| 2024-07 |
0.032 |
0.014 |
| 2025-01 |
0.036 |
0.017 |
| 2025-07 |
0.035 |
0.009 |
| 2026-01 |
0.044 |
0.011 |
| 2026-07 |
0.034 |
0.005 |
| 2027-01 |
0.046 |
0.007 |
Ephemeris comparison
Difference between NIMAv7 and JPL57 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