(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 | 8.73 |
| G slop | 0.15 |
(1) Data from the johnston archive list.
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 |
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| Number of unpublished observations | 5 |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.