(99943) 2005AS2
This object has a more recent orbit available here
Object
| Object | (99943) 2005AS2 |
| Diameter(1) | 28 km |
| Dynamic class(1) | trojan |
| Absolute magnitude | 11.60 |
| G slop | 0.15 |
(1) Data from the johnston archive list.
Orbital elements
| Epoch (Julian date) | 2458600.5 |
| Semi major axis | 5.278337 ± 0.000000 au |
| Eccentricity | 0.108977100 ± 0.000000076 |
| Inclination | 13.546524538 ± 0.000006262 ° |
| Longitude of ascending node | 116.269612 ± 0.000012 ° |
| Argument of perihelia | 88.682482 ± 0.000034 ° |
| Mean anomaly | 358.933137 ± 0.000031 ° |
| Orbital period | 12.13 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv2 |
| Observation file |
omc_ast_NIMAv2.txt |
| bsp file | 99943_2005AS2_nima_v2.bsp |
| Date of first observation | 1996-06-21 |
| Date of last observation | 2021-09-07 |
| Number of observations used in the fit | 1427 |
| Number of rejected observations | 4 |
| Number of DES observations | 38 |
| Number of MPC observations | 1391 |
| Number of unpublished observations | 2 |
| RMS of observations | 0.382 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv2 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date | σα (arcsec) | σδ (arcsec) |
| 2021-01 | 0.008 | 0.008 |
| 2021-07 | 0.008 | 0.008 |
| 2022-01 | 0.008 | 0.006 |
| 2022-07 | 0.019 | 0.013 |
| 2023-01 | 0.016 | 0.013 |
| 2023-07 | 0.029 | 0.021 |
| 2024-01 | 0.026 | 0.019 |
| 2024-07 | 0.035 | 0.024 |
| 2025-01 | 0.035 | 0.024 |
Ephemeris comparison
Difference between NIMAv2 and JPL31 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.