(19521) Chaos


This object has a more recent orbit available here

Object

Object (19521) Chaos
Diameter(1) 600 km
Dynamic class(1) cubewano
Absolute magnitude 4.64
G slop 0.15
(1) Data from the johnston archive list.

Orbital elements

Epoch (Julian date) 2459800.5
Semi major axis 45.755453 ± 0.003144 au
Eccentricity 0.103175178 ± 0.000044141
Inclination 12.018360203 ± 0.000036995 °
Longitude of ascending node 49.899934 ± 0.000134 °
Argument of perihelia 55.659452 ± 0.012847 °
Mean anomaly 347.178107 ± 0.011612 °
Orbital period 309.51 yr

Ephemeris & Observations

Ephemeris version NIMAv8
Observation file (documentation) omc_ast_NIMAv8.txt
bsp file 19521_Chaos_nima_v8.bsp
Date of first observation 1991-10-17
Date of last observation 2021-01-11
Number of observations used in the fit 259
Number of rejected observations 3
Number of DES observations 0
Number of MPC observations 167
Number of unpublished observations 95
RMS of observations 0.291 arcsec

Residuals

residual plot

Residuals in right ascension and declination compared to NIMAv8 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.

Orbit quality

date σα (arcsec) σδ (arcsec)
2022-01 0.052 0.012
2022-07 0.028 0.021
2023-01 0.053 0.016
2023-07 0.040 0.023
2024-01 0.058 0.020
2024-07 0.055 0.025
2025-01 0.068 0.025
2025-07 0.074 0.027
2026-01 0.084 0.030

Ephemeris comparison

residual plot

Difference between NIMAv8 and JPL16 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.