(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 | 11.71 |
| G slop | 0.15 |
(1) Data from the johnston archive list.
Orbital elements
| Epoch (Julian date) | 2459800.5 |
| Semi major axis | 5.296161 ± 0.000000 au |
| Eccentricity | 0.109014645 ± 0.000000020 |
| Inclination | 13.538405791 ± 0.000001298 ° |
| Longitude of ascending node | 116.260607 ± 0.000003 ° |
| Argument of perihelia | 90.611287 ± 0.000014 ° |
| Mean anomaly | 94.559080 ± 0.000011 ° |
| Orbital period | 12.19 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv4 |
| Observation file |
omc_ast_NIMAv4.txt |
| bsp file | 99943_2005AS2_nima_v4.bsp |
| Date of first observation | 1996-06-21 |
| Date of last observation | 2022-10-19 |
| Number of observations used in the fit | 1952 |
| Number of rejected observations | 6 |
| Number of DES observations | 38 |
| Number of MPC observations | 1619 |
| Number of unpublished observations | 2 |
| RMS of observations | 0.120 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv4 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date | σα (arcsec) | σδ (arcsec) |
| 2023-01 | 0.011 | 0.003 |
| 2023-07 | 0.018 | 0.007 |
| 2024-01 | 0.016 | 0.006 |
| 2024-07 | 0.022 | 0.009 |
| 2025-01 | 0.022 | 0.009 |
| 2025-07 | 0.025 | 0.010 |
| 2026-01 | 0.029 | 0.012 |
| 2026-07 | 0.028 | 0.010 |
| 2027-01 | 0.036 | 0.013 |
Ephemeris comparison
Difference between NIMAv4 and JPL37 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.