(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 45.460424 ± 0.006175 au
Eccentricity 0.098623709 ± 0.000079510
Inclination 12.057033733 ± 0.001071918 °
Longitude of ascending node 50.042737 ± 0.001374 °
Argument of perihelia 58.497787 ± 0.035028 °
Mean anomaly 340.741902 ± 0.032898 °
Orbital period 306.52 yr

Ephemeris & Observations

Ephemeris version NIMAv3
Observation file (documentation) omc_ast_NIMAv3.txt
bsp file 19521_Chaos_nima_v3.bsp
Date of first observation 1991-10-17
Date of last observation 2018-12-07
Number of observations used in the fit 177
Number of rejected observations 1
Number of DES observations 0
Number of MPC observations 112
Number of unpublished observations 66
RMS of observations 0.396 arcsec

Residuals

residual plot

Residuals in right ascension and declination compared to NIMAv3 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.

Orbit quality

date σα (arcsec) σδ (arcsec)
2018-01 0.105 0.097
2018-07 0.164 0.098
2019-01 0.135 0.105
2019-07 0.212 0.104
2020-01 0.183 0.114
2020-07 0.270 0.110
2021-01 0.246 0.124
2021-07 0.338 0.117
2022-01 0.320 0.135

Ephemeris comparison

residual plot

Difference between NIMAv3 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.