(99943) 2005AS2


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 (documentation) 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Number of unpublished observations 2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

residual plot

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

residual plot

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.

Previous NIMA versions