(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 | 8.74 |
| G slop | 0.15 |
(1) Data from the johnston archive list.
Orbital elements
| Epoch (Julian date) | 2460600.5 |
| Semi major axis | 5.207680 ± 0.000000 au |
| Eccentricity | 0.124572235 ± 0.000000031 |
| Inclination | 8.895517409 ± 0.000001977 ° |
| Longitude of ascending node | 301.458262 ± 0.000011 ° |
| Argument of perihelia | 337.472192 ± 0.000022 ° |
| Mean anomaly | 96.384859 ± 0.000014 ° |
| Orbital period | 11.88 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv8 |
| Observation file |
omc_ast_NIMAv8.txt |
| bsp file | 884_Priamus_nima_v8.bsp |
| Date of first observation | 1917-09-22 |
| Date of last observation | 2024-07-13 |
| Number of observations used in the fit | 4616 |
| Number of rejected observations | 39 |
| Number of DES observations | 0 |
| Number of MPC observations | 4650 |
| Number of unpublished observations | 5 |
| RMS of observations | 3.304 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv8 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date | σα (arcsec) | σδ (arcsec) |
| 2024-01 | 0.022 | 0.014 |
| 2024-07 | 0.028 | 0.013 |
| 2025-01 | 0.031 | 0.015 |
| 2025-07 | 0.030 | 0.008 |
| 2026-01 | 0.039 | 0.011 |
| 2026-07 | 0.030 | 0.005 |
| 2027-01 | 0.041 | 0.007 |
| 2027-07 | 0.028 | 0.008 |
| 2028-01 | 0.036 | 0.014 |
Ephemeris comparison
Difference between NIMAv8 and JPL63 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.