(1173) Anchises


Object

Object (1173) Anchises
Diameter(1) 99 km
Dynamic class(1) trojan
Absolute magnitude 8.89
G slop 0.15
(1) Data from the johnston archive list.

Orbital elements

Epoch (Julian date) 2458200.5
Semi major axis 5.295493 ± 0.000000 au
Eccentricity 0.137423824 ± 0.000000053
Inclination 6.920196460 ± 0.000001464 °
Longitude of ascending node 283.913996 ± 0.000024 °
Argument of perihelia 40.496264 ± 0.000021 °
Mean anomaly 184.439866 ± 0.000021 °
Orbital period 12.19 yr

Ephemeris & Observations

Ephemeris version NIMAv3
Observation file (documentation) omc_ast_NIMAv3.txt
bsp file 1173_Anchises_nima_v3.bsp
Date of first observation 1930-10-17
Date of last observation 2021-01-12
Number of observations used in the fit 2683
Number of rejected observations 14
Number of DES observations 0
Number of MPC observations 2695
Number of unpublished observations 2
RMS of observations 2.099 arcsec

Residuals

residual plot

Residuals in right ascension and declination compared to NIMAv3 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 0.005
2021-07 0.006 0.007
2022-01 0.011 0.007
2022-07 0.021 0.012
2023-01 0.022 0.010
2023-07 0.047 0.022
2024-01 0.036 0.017
2024-07 0.058 0.030
2025-01 0.050 0.025

Ephemeris comparison

residual plot

Difference between NIMAv3 and JPL57 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