(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) | 2458200.5 |
| Semi major axis | 5.181693 ± 0.000000 au |
| Eccentricity | 0.122168661 ± 0.000000053 |
| Inclination | 8.915045772 ± 0.000005574 ° |
| Longitude of ascending node | 301.560172 ± 0.000025 ° |
| Argument of perihelia | 335.462286 ± 0.000030 ° |
| Mean anomaly | 257.838166 ± 0.000042 ° |
| Orbital period | 11.80 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv1 |
| Observation file |
omc_ast_NIMAv1.txt |
| bsp file | 884_Priamus_nima_v1.bsp |
| Date of first observation | 1917-09-22 |
| Date of last observation | 2019-01-29 |
| Number of observations used in the fit | 2115 |
| Number of rejected observations | 44 |
| Number of DES observations | 0 |
| Number of MPC observations | 2159 |
| Number of unpublished observations | 0 |
| RMS of observations | 0.575 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv1 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date | σα (arcsec) | σδ (arcsec) |
| 2018-01 | 0.018 | 0.016 |
| 2018-07 | 0.016 | 0.015 |
| 2019-01 | 0.025 | 0.019 |
| 2019-07 | 0.026 | 0.021 |
| 2020-01 | 0.033 | 0.019 |
| 2020-07 | 0.045 | 0.026 |
| 2021-01 | 0.040 | 0.016 |
| 2021-07 | 0.065 | 0.025 |
| 2022-01 | 0.042 | 0.018 |
Ephemeris comparison
Difference between NIMAv1 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.