Summary for : (809) Lundia

DynT.TT.BT T.L B T.DDensity (g/cm^3)Δρ/ρDiameter (km)ΔD/DMass (kg)ΔM/MRefAvg.M
MBA--V | V-1.64 ± 0.55   (C)33 %10.3 ± 0.10.7 %9.27e+14 ± 3.09e+1433 %SEVM
MBA--V | V-1.64 ± 0.55   (C)33 %10.3 ± 0.10.7 %9.27e+14 ± 3.09e+1433 %Sw.avg
MBAV1.64 ± 0.10   (B)6 %10.3 ± 0.10.7 %9.27e+14 ± 3.09e+1433 %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:
3D Model | JPL New Horizons | Minor Planet Center | Wikipedia (these auto-generated links might not work)

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)

(Indirect) density estimates

Density (g/cm^3)Δρ/ρMethodYearRefN
1.64 ± 0.106.1 %PheMu2009BD10

PheMu : Mutual eclipsing phenomena in binary systems.
References
BD10(2009):Kryszczynska, A., Colas, F., Descamps, P., et al., 2009. New binary asteroid 809 Lundia. I. Photometry and modelling. Astronomy and Astrophysics 501, 769-776.

Diameter estimates

DesignationDiameter / Err (km)ΔD/DMethodYearRefNχ2Use
(809) Lundia10.26 ± 0.070.7 % NEATM2011D72 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).

NEATM : Near-Earth Asteroid Thermal Model.


EVM diam. average D = (10.3 ± 0.07) km   (ΔD/D = 1%, SNR = 146.57) Derived bulk density ρ = (1.64 ± 0.55) g/cm3   (Δρ/ρ = 33%, SNR = 3.0)


References
D72(2011):Masiero, J.R., Mainzer, A.K., Grav, T., Bauer, J.M., Cutri, R.M., Dailey, J., Eisenhardt, P.R.M., McMillan, R.S., Spahr, T.B., Skrutskie, M.F., Tholen, D., Walker, R.G., Wright, E.L., DeBaun, E., Elsbury, D., Gautier, IV, T., Gomillion, S., Wilkins, A., 2011. Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters. Astrophysical Journal 741, 68.

Mass estimates

DesignationMass / Err (kg)ΔM/MMethodYearRefNχ2Use
(809) Lundia9.27e+14 ± 3.09e+1433 %PheMu 2009M790.00 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).

PheMu : Mutual eclipsing phenomena in binary systems.


EVM mass average M = (9.270 ± 3.090) × 1014 kg   (ΔM/M = 33%, SNR = 3.0) Derived bulk density ρ = (1.64 ± 0.55) g/cm3   (Δρ/ρ = 33%, SNR = 3.0)


References
M79(2009):Kryszczyńska, A., Colas, F., Descamps, P., Bartczak, P., Polińska, M., Kwiatkowski, T., Lecacheux, J., Hirsch, R., Fagas, M., Kamiński, K., Michałowski, T., Marciniak, A., 2009. New binary asteroid 809 Lundia. I. Photometry and modelling. Astronomy and Astrophysics 501, 769–776.