Summary for : (624) Hektor

DynT.TT.BT T.L B T.DDensity (g/cm^3)Δρ/ρDiameter (km)ΔD/DMass (kg)ΔM/MRefAvg.M
MBAD-- | --1.81 ± 0.63   (C)35 %218.9 ± 25.211.5 %9.95e+18 ± 1.20e+171 %SEVM
MBAD-- | --1.67 ± 0.46   (C)27 %224.9 ± 20.59.1 %9.95e+18 ± 1.20e+171 %Sw.avg
MBAX1.63 ± 0.32   (C)20 %226.7 ± 15.26.7 %9.95e+18 ± 1.20e+171 %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)

Diameter estimates

DesignationDiameter / Err (km)ΔD/DMethodYearRefNχ2Use
(624) Hektor203.00 ± 3.591.8 % NEATM2003D92 19.72 1
(624) Hektor239.19 ± 2.401.0 % NEATM2003D9 71.17 2
(624) Hektor230.99 ± 3.941.7 % TPM2011D83 9.35 3
(624) Hektor163.89 ± 7.194.4 % NEATM2011D7312 58.63 4

plot, average diameter and derived density

All

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. TPM : Thermophysical Model.


EVM diam. average D = (218.9 ± 25.23) km   (ΔD/D = 12%, SNR = 8.68) Derived bulk density ρ = (1.81 ± 0.63) g/cm3   (Δρ/ρ = 35%, SNR = 2.9)


References
D9(2003):Fernández, Y.R., Sheppard, S.S., Jewitt, D.C., 2003. The Albedo Distribution of Jovian Trojan Asteroids. Astronomical Journal 126, 1563–1574.
D73(2011):Grav, T., Mainzer, A.K., Bauer, J., Masiero, J., Spahr, T., McMillan, R.S., Walker, R., Cutri, R., Wright, E., Eisenhardt, P.R.M., Blauvelt, E., DeBaun, E., Elsbury, D., Gautier, IV, T., Gomillion, S., Hand, E., Wilkins, A., 2011. WISE/NEOWISE Observations of the Jovian Trojans: Preliminary Results. Astrophysical Journal 742, 40.
D83(2011):Usui, F., Kuroda, D., Müller, T.G., Hasegawa, S., Ishiguro, M., Ootsubo, T., Ishihara, D., Kataza, H., Takita, S., Oyabu, S., Ueno, M., Matsuhara, H., Onaka, T., 2011. Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey. Publications of the Astronomical Society of Japan 63, 1117–1138.

Mass estimates

DesignationMass / Err (kg)ΔM/MMethodYearRefNχ2Use
(624) Hektor9.95e+18 ± 1.20e+171 %BinImg 2011M1060.00 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 = (9.950 ± 0.120) × 1018 kg   (ΔM/M = 1%, SNR = 82.9) Derived bulk density ρ = (1.81 ± 0.63) g/cm3   (Δρ/ρ = 35%, SNR = 2.9)


References
M106(2011):Descamps et al. (ref. ?). See: Carry, B., 2012. Density of asteroids. Planetary and Space Science, Volume 73, Issue 1, p. 98-118.