(50000) Quaoar
This object has a more recent orbit available here
Object
Object | (50000) Quaoar |
Diameter(1) | 1110 km |
Dynamic class(1) | cubewano |
Absolute magnitude | 2.51 |
G slop | 0.15 |
(1) Data from the johnston archive list.
Orbital elements
Epoch (Julian date) | 2459800.5 |
Semi major axis | 43.472052 ± 0.000055 au |
Eccentricity | 0.040988953 ± 0.000000741 |
Inclination | 7.991223068 ± 0.000000527 ° |
Longitude of ascending node | 189.090356 ± 0.000026 ° |
Argument of perihelia | 155.213944 ± 0.001227 ° |
Mean anomaly | 296.223614 ± 0.001215 ° |
Orbital period | 286.63 yr |
Ephemeris & Observations
Ephemeris version | NIMAv19 |
Observation file |
omc_ast_NIMAv19.txt |
bsp file | 50000_Quaoar_nima_v19.bsp |
Date of first observation | 1954-05-25 |
Date of last observation | 2024-04-10 |
Number of observations used in the fit | 1374 |
Number of rejected observations | 206 |
Number of DES observations | 0 |
Number of MPC observations | 715 |
Number of unpublished observations | 531 |
RMS of observations | 0.099 arcsec |
Residuals

Residuals in right ascension and declination compared to NIMAv19 ephemeris.
Colours indicate the estimated precision in arcsec used as weights in the fitting process.
Orbit quality
date | σα (arcsec) | σδ (arcsec) |
2023-01 | 0.002 | 0.001 |
2023-07 | 0.002 | 0.002 |
2024-01 | 0.002 | 0.002 |
2024-07 | 0.003 | 0.002 |
2025-01 | 0.003 | 0.002 |
2025-07 | 0.003 | 0.002 |
2026-01 | 0.004 | 0.002 |
2026-07 | 0.004 | 0.002 |
2027-01 | 0.005 | 0.002 |
Ephemeris comparison

Difference between NIMAv19 and JPL44 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.