(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 45.462656 ± 0.005590 au
Eccentricity 0.098648098 ± 0.000073579
Inclination 12.057034302 ± 0.000912179 °
Longitude of ascending node 50.042734 ± 0.001343 °
Argument of perihelia 58.482184 ± 0.030301 °
Mean anomaly 340.755787 ± 0.028730 °
Orbital period 306.54 yr

Ephemeris & Observations

Ephemeris version NIMAv4
Observation file (documentation) omc_ast_NIMAv4.txt
bsp file 19521_Chaos_nima_v4.bsp
Date of first observation 1991-10-17
Date of last observation 2019-11-30
Number of observations used in the fit 185
Number of rejected observations 1
Number of DES observations 0
Number of MPC observations 112
Number of unpublished observations 74
RMS of observations 0.393 arcsec

Residuals

residual plot

Residuals in right ascension and declination compared to NIMAv4 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.

Orbit quality

date σα (arcsec) σδ (arcsec)
2019-01 0.116 0.098
2019-07 0.165 0.099
2020-01 0.151 0.106
2020-07 0.211 0.105
2021-01 0.199 0.115
2021-07 0.265 0.111
2022-01 0.257 0.124
2022-07 0.328 0.118
2023-01 0.326 0.133

Ephemeris comparison

residual plot

Difference between NIMAv4 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.