(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 0.104369202 ± 0.000000066
Inclination 16.664084509 ± 0.000006455 °
Longitude of ascending node 247.326005 ± 0.000015 °
Argument of perihelia 50.657445 ± 0.000037 °
Mean anomaly 271.733127 ± 0.000044 °
Orbital period 11.92 yr

Ephemeris & Observations

Ephemeris version NIMAv4
Observation file (documentation) omc_ast_NIMAv4.txt
bsp file 1172_Aneas_nima_v4.bsp
Date of first observation 1930-10-17
Date of last observation 2020-08-27
Number of observations used in the fit 2757
Number of rejected observations 36
Number of DES observations 0
Number of MPC observations 2765
Number of unpublished observations 28
RMS of observations 0.478 arcsec

Residuals

residual plot

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)
2020-01 0.007 0.014
2020-07 0.009 0.017
2021-01 0.014 0.014
2021-07 0.030 0.026
2022-01 0.028 0.020
2022-07 0.054 0.036
2023-01 0.042 0.026
2023-07 0.060 0.031
2024-01 0.053 0.026

Ephemeris comparison

residual plot

Difference between NIMAv4 and JPL83 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