Summary for : 2003 QY90

DynT.TT.BT T.L B T.DDensity (g/cm^3)Δρ/ρDiameter (km)ΔD/DMass (kg)ΔM/MRefAvg.M
TNO--- | --0.57 ± 0.72   (E)127 %150.0 ± 50.033.3 %1.01e+18 ± 7.85e+1778 %SEVM
TNO--- | --0.57 ± 0.72   (E)127 %150.0 ± 50.033.3 %1.01e+18 ± 7.85e+1778 %Sw.avg
TNO-0.57 ± 0.72   (E)126 %150.0 ± 50.033.3 %1.01e+18 ± 7.80e+1777 %C?

Average asteroid densities (g/cm^3):
C = 1.3 ± 0.6, B = 2.4 ± 0.5, S = 2.7 ± 0.5, M = 3.5 ± 1.0, P = 2.8 ± 1.6, X = 1.9 ± 0.8, Xc = 4.9 ± 0.9, Xk = 4.2 ± 0.7 (Ref)

Additional resources:

Note: The density estimates have been ranked from (A) to (E), corresponding to the relative error: (B) less than 20%, (C) between 20 and 50%, (D) between 50 and 100%, and (E) more than 100%. (A) stands for (presumably) reliable estimates (accuracy better than 20%), based on more than 5 mass estimates and 5 diameter estimates, or a spacecraft encounter. Apparently unrealistic densities (ρ > 8) are tagged with (X).

EVM: average by using the Expected Value Method (Ref). w.avg: weighted average (with w = 1/err^2).

T.T: Tholen Tax Class. T.B: Bus & Binzel Tax Class. T T.L: S3OS2 Lazarro (Tholen) Tax Class. T.L B: S3OS2 Lazarro (Bus & Binzel) Tax Class. T.D: DeMeo Tax Class.

Ref: S = SiMDA, C = Carry (2012)

Diameter estimates

DesignationDiameter / Err (km)ΔD/DMethodYearRefNχ2Use
2003 QY90150.00 ± 50.0033.3 % H-mag2012D90 0.00 1

Notes (N):
1: This estimate is discarded for the average diameter (and derived density) calculation in Carry (2012).
2: This estimate is discarded for the average diameter (and derived density) calculation in SiMDA (catalog).

H-mag : Crude estimate from absolute magnitude.


EVM diam. average D = (150.0 ± 50.00) km   (ΔD/D = 33%, SNR = 3.00) Derived bulk density ρ = (0.57 ± 0.72) g/cm3   (Δρ/ρ = 127%, SNR = 0.8)


References
D90(2012):MPEC

Mass estimates

DesignationMass / Err (kg)ΔM/MMethodYearRefNχ2Use
2003 QY901.01e+18 ± 7.85e+1778 %BinImg 2006M570.00 1

Notes (N):
1: This estimate is discarded for the average mass (and derived density) calculation in Carry (2012).
2: This estimate is discarded for the average mass (and derived density) calculation in SiMDA (catalog).
3: This estimate is an average of individual solutions listed before under the same reference (e.g. M125).

BinImg : Binary imaged at optical wavelength.


EVM mass average M = (1.010 ± 0.785) × 1018 kg   (ΔM/M = 78%, SNR = 1.3) Derived bulk density ρ = (0.57 ± 0.72) g/cm3   (Δρ/ρ = 127%, SNR = 0.8)


References
M57(2006):Kern, S.D., Elliot, J.L., 2006. Discovery and characteristics of the Kuiper belt binary 2003QY90. Icarus 183, 179–185.