(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 | 11.70 |
| G slop | 0.15 |
(1) Data from the johnston archive list.
Orbital elements
| Epoch (Julian date) | 2460600.5 |
| Semi major axis | 5.295337 ± 0.000000 au |
| Eccentricity | 0.108391298 ± 0.000000020 |
| Inclination | 13.532040754 ± 0.000001297 ° |
| Longitude of ascending node | 116.238764 ± 0.000003 ° |
| Argument of perihelia | 90.306242 ± 0.000014 ° |
| Mean anomaly | 159.705504 ± 0.000010 ° |
| Orbital period | 12.19 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv5 |
| Observation file |
omc_ast_NIMAv5.txt |
| bsp file | 99943_2005AS2_nima_v5.bsp |
| Date of first observation | 1996-06-21 |
| Date of last observation | 2023-12-09 |
| Number of observations used in the fit | 2059 |
| Number of rejected observations | 6 |
| Number of DES observations | 38 |
| Number of MPC observations | 1726 |
| Number of unpublished observations | 2 |
| RMS of observations | 0.120 arcsec |
Residuals
Residuals in right ascension and declination compared to NIMAv5 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
| date | σα (arcsec) | σδ (arcsec) |
| 2024-01 | 0.016 | 0.005 |
| 2024-07 | 0.022 | 0.009 |
| 2025-01 | 0.022 | 0.008 |
| 2025-07 | 0.025 | 0.010 |
| 2026-01 | 0.028 | 0.012 |
| 2026-07 | 0.028 | 0.010 |
| 2027-01 | 0.036 | 0.013 |
| 2027-07 | 0.031 | 0.008 |
| 2028-01 | 0.046 | 0.011 |
Ephemeris comparison
Difference between NIMAv5 and JPL41 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.