(1172) Aneas


Object

Object (1172) Aneas
Diameter(1) 118 km
Dynamic class(1) trojan
Absolute magnitude 8.33
G slop 0.15
(1) Data from the johnston archive list.

Orbital elements

Epoch (Julian date) 2458600.5
Semi major axis 5.218844 ± 0.000000 au
Eccentricity 0.104369179 ± 0.000000051
Inclination 16.664083467 ± 0.000005031 °
Longitude of ascending node 247.326009 ± 0.000008 °
Argument of perihelia 50.657449 ± 0.000023 °
Mean anomaly 271.733117 ± 0.000020 °
Orbital period 11.92 yr

Ephemeris & Observations

Ephemeris version NIMAv5
Observation file (documentation) omc_ast_NIMAv5.txt
bsp file 1172_Aneas_nima_v5.bsp
Date of first observation 1930-10-17
Date of last observation 2021-06-17
Number of observations used in the fit 2808
Number of rejected observations 20
Number of DES observations 0
Number of MPC observations 2799
Number of unpublished observations 29
RMS of observations 3.950 arcsec

Residuals

residual plot

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)
2021-01 0.005 0.007
2021-07 0.009 0.009
2022-01 0.010 0.009
2022-07 0.022 0.019
2023-01 0.019 0.016
2023-07 0.033 0.022
2024-01 0.031 0.020
2024-07 0.038 0.018
2025-01 0.042 0.018

Ephemeris comparison

residual plot

Difference between NIMAv5 and JPL96 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