(50000) Quaoar


Object

Object (50000) Quaoar
Diameter(1) 1111 km
Dynamic class(1) cubewano-hot
Absolute magnitude 2.50
G slop 0.15
(1) Data from the johnston archive list.

Orbital elements

Epoch (Julian date) 2460800.5
Semi major axis 43.163010 ± 0.000054 au
Eccentricity 0.036646104 ± 0.000000631
Inclination 7.991242136 ± 0.000000483 °
Longitude of ascending node 189.005210 ± 0.000024 °
Argument of perihelia 163.783746 ± 0.001416 °
Mean anomaly 290.969056 ± 0.001406 °
Orbital period 283.58 yr

Ephemeris & Observations

Ephemeris version NIMAv20
Observation file (documentation) omc_ast_NIMAv20.txt
bsp file 50000_Quaoar_nima_v20.bsp
Date of first observation 1954-05-25
Date of last observation 2025-06-12
Number of observations used in the fit 1521
Number of rejected observations 74
Number of DES observations 0
Number of MPC observations 725
Number of unpublished observations 536
RMS of observations 0.099 arcsec

Residuals

residual plot

Residuals in right ascension and declination compared to NIMAv20 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.

Orbit quality

date σα (arcsec) σδ (arcsec)
2024-01 0.002 0.002
2024-07 0.002 0.002
2025-01 0.002 0.002
2025-07 0.003 0.002
2026-01 0.003 0.002
2026-07 0.004 0.002
2027-01 0.004 0.002
2027-07 0.005 0.002
2028-01 0.005 0.002

Ephemeris comparison

residual plot

Difference between NIMAv20 and JPL48 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