(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 4.80
G slop 0.15
(1) Data from the johnston archive list.

Orbital elements

Epoch (Julian date) 2458600.5
Semi major axis 45.460061 ± 0.004085 au
Eccentricity 0.098621553 ± 0.000057960
Inclination 12.057071254 ± 0.000491017 °
Longitude of ascending node 50.042777 ± 0.001240 °
Argument of perihelia 58.501973 ± 0.018092 °
Mean anomaly 340.738317 ± 0.018028 °
Orbital period 306.52 yr

Ephemeris & Observations

Ephemeris version NIMAv5
Observation file (documentation) omc_ast_NIMAv5.txt
bsp file 19521_Chaos_nima_v5.bsp
Date of first observation 1991-10-17
Date of last observation 2020-11-19
Number of observations used in the fit 205
Number of rejected observations 11
Number of DES observations 0
Number of MPC observations 112
Number of unpublished observations 104
RMS of observations 0.346 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)
2020-01 0.093 0.070
2020-07 0.075 0.072
2021-01 0.102 0.074
2021-07 0.093 0.076
2022-01 0.118 0.079
2022-07 0.116 0.080
2023-01 0.139 0.084
2023-07 0.144 0.085
2024-01 0.166 0.090

Ephemeris comparison

residual plot

Difference between NIMAv5 and JPL12 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.