(19521) Chaos


Object

Object (19521) Chaos
Diameter(1) 600 km
Dynamic class(1) cubewano
Absolute magnitude 4.80
G slop 0.15
(1) Data from the johnston archive list.

Orbital elements

Epoch (Julian date) 2458600.5
Semi major axis 45.458795 ± 0.003027 au
Eccentricity 0.098609254 ± 0.000042703
Inclination 12.057065561 ± 0.000350023 °
Longitude of ascending node 50.042725 ± 0.000894 °
Argument of perihelia 58.512796 ± 0.013322 °
Mean anomaly 340.728887 ± 0.013358 °
Orbital period 306.50 yr

Ephemeris & Observations

Ephemeris version NIMAv7
Observation file (documentation) omc_ast_NIMAv7.txt
bsp file 19521_Chaos_nima_v7.bsp
Date of first observation 1991-10-17
Date of last observation 2020-11-20
Number of observations used in the fit 256
Number of rejected observations 13
Number of DES observations 0
Number of MPC observations 164
Number of unpublished observations 105
RMS of observations 0.293 arcsec

Residuals

residual plot

Residuals in right ascension and declination compared to NIMAv7 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.

Orbit quality

date σα (arcsec) σδ (arcsec)
2021-01 0.055 0.010
2021-07 0.020 0.020
2022-01 0.054 0.012
2022-07 0.027 0.021
2023-01 0.054 0.016
2023-07 0.039 0.023
2024-01 0.058 0.020
2024-07 0.055 0.025
2025-01 0.068 0.025

Ephemeris comparison

residual plot

Difference between NIMAv7 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.

Previous NIMA versions