(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) | 2458200.5 |
| Semi major axis | 5.276688 ± 0.000001 au |
| Eccentricity | 0.108556725 ± 0.000000162 |
| Inclination | 13.546921587 ± 0.000008257 ° |
| Longitude of ascending node | 116.274840 ± 0.000037 ° |
| Argument of perihelia | 88.444542 ± 0.000063 ° |
| Mean anomaly | 326.588517 ± 0.000038 ° |
| Orbital period | 12.12 yr |
Ephemeris & Observations
| Ephemeris version | NIMAv1 |
| Observation file |
omc_ast_NIMAv1.txt |
| bsp file | 99943_2005AS2_nima_v1.bsp |
| Date of first observation | 1996-06-21 |
| Date of last observation | 2018-11-21 |
| Number of observations used in the fit | 880 |
| Number of rejected observations | 2 |
| Number of DES observations | 38 |
| Number of MPC observations | 844 |
| Number of unpublished observations | 0 |
| RMS of observations | 0.419 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 | 0.045 | 0.034 |
| 2018-07 | 0.040 | 0.026 |
| 2019-01 | 0.056 | 0.031 |
| 2019-07 | 0.064 | 0.033 |
| 2020-01 | 0.068 | 0.032 |
| 2020-07 | 0.097 | 0.045 |
| 2021-01 | 0.075 | 0.030 |
| 2021-07 | 0.113 | 0.042 |
| 2022-01 | 0.075 | 0.028 |
Ephemeris comparison
Difference between NIMAv1 and JPL23 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.