(1173) Anchises


This object has a more recent orbit available here

Object

Object (1173) Anchises
Diameter(1) 99 km
Dynamic class(1) trojan
Absolute magnitude 8.90
G slop 0.15
(1) Data from the johnston archive list.

Orbital elements

Epoch (Julian date) 2456633.455055235
Semi major axis 5.303868 ± 0.000000 au
Eccentricity 0.137567402 ± 0.000000014
Inclination 6.914990954 ± 0.000000516 °
Longitude of ascending node 283.908293 ± 0.000002 °
Argument of perihelia 41.158117 ± 0.000004 °
Mean anomaly 57.015743 ± 0.000004 °
Orbital period 12.22 yr

Ephemeris & Observations

Ephemeris version NIMAv5
Observation file (documentation) omc_ast_NIMAv5.txt
bsp file 1173_Anchises_nima_v5.bsp
Date of first observation 1930-10-17
Date of last observation 2023-08-10
Number of observations used in the fit 4443
Number of rejected observations 27
Number of DES observations 0
Number of MPC observations 4108
Number of unpublished observations 95
RMS of observations 0.125 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)
2023-01 0.009 0.002
2023-07 0.017 0.006
2024-01 0.013 0.005
2024-07 0.020 0.010
2025-01 0.017 0.008
2025-07 0.020 0.007
2026-01 0.021 0.008
2026-07 0.019 0.003
2027-01 0.024 0.004

Ephemeris comparison

residual plot

Difference between NIMAv5 and JPL60 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.