Summary for : (253) Mathilde

DynT.TT.BT T.L B T.DDensity (g/cm^3)Δρ/ρDiameter (km)ΔD/DMass (kg)ΔM/MRefAvg.M
MBA-Cb- | --1.51 ± 2.19   (E)145 %54.4 ± 3.46.3 %1.27e+17 ± 1.82e+17144 %SEVM
MBA-Cb- | --1.24 ± 10.38   (E)834 %54.1 ± 3.46.3 %1.03e+17 ± 8.60e+17834 %Sw.avg
MBACb1.32 ± 0.20   (A)15 %53.0 ± 2.64.9 %1.03e+17 ± 4.00e+154 %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
(253) Mathilde58.04 ± 2.594.5 % STM2004D9312 2.02 1
(253) Mathilde49.62 ± 1.943.9 % STM2010D642 5.96 2
(253) Mathilde62.51 ± 3.125.0 % NEATM2010D642 6.83 3
(253) Mathilde53.00 ± 2.594.9 % IAU2011D75 0.27 4
(253) Mathilde54.00 ± 0.871.6 % STM2011D8312 0.17 5

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).

IAU : IAU WGCCR consensus value. NEATM : Near-Earth Asteroid Thermal Model. STM : Standard Thermal Model.


EVM diam. average D = (54.4 ± 3.42) km   (ΔD/D = 6%, SNR = 15.89) Derived bulk density ρ = (1.51 ± 2.19) g/cm3   (Δρ/ρ = 145%, SNR = 0.7)


References
D64(2010):Ryan, E.L., Woodward, C.E., 2010. Rectified Asteroid Albedos and Diameters from IRAS and MSX Photometry Catalogs. Astronomical Journal 140, 933–943.
D75(2011):Archinal, B.A., A'Hearn, M.F., Bowell, E., Conrad, A., Consolmagno, G.J., Courtin, R., Fukushima, T., Hestroffer, D., Hilton, J.L., Krasinsky, G.A., Neumann, G., Oberst, J., Seidelmann, P.K., Stooke, P., Tholen, D.J., Thomas, P.C., Williams, I.P., 2011. Report of the IAU Working Group on Cartographic Coordinates and Rotational Elements: 2009. Celestial Mechanics and Dynamical Astronomy 109, 101–135.
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.
D93(2004):Tedesco, E.F., Noah, P.V., Noah, M.C., Price, S.D., 2004. IRAS Minor Planet Survey. NASA Planetary Data System. IRAS-A-FPA-3-RDR-IMPS-V6.0.

Mass estimates

DesignationMass / Err (kg)ΔM/MMethodYearRefNχ2Use
(253) Mathilde1.03e+17 ± 4.38e+154 %FlyBy 1997M1429.83 1
(253) Mathilde1.80e+18 ± 1.29e+1872 %Ephem 2010M93121.68 2
(253) Mathilde1.19e+18 ± 5.97e+1750 %Ephem 2011M100123.17 3

plot, average mass and derived density

All

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).

Ephem : Planetary ephemeris solution. FlyBy : Spacecraft radio experiment (ranging etc. from flyby, orbiter or lander).


EVM mass average M = (1.269 ± 1.825) × 1017 kg   (ΔM/M = 144%, SNR = 0.7) Derived bulk density ρ = (1.51 ± 2.19) g/cm3   (Δρ/ρ = 145%, SNR = 0.7)


References
M14(1997):Yeomans, D.K., Barriot, J.P., Dunham, D.W., Farquhar, R.W., Giorgini, J.D., Helfrich, C.E., Konopliv, A.S., McAdams, J.V., Miller, J.K., Owen, Jr., W.M., Scheeres, D.J., Synnott, S.P., Williams, B.G., 1997. Estimating the Mass of Asteroid 253 Mathilde from Tracking Data During the NEAR Flyby. Science 278, 2106.
M93(2010):Fienga, A., Manche, H., Kuchynka, P., Laskar, J., Gastineau, M., 2010. INPOP10a. Scientific Notes.
M100(2011):Fienga, A., Kuchynka, P., Laskar, J., Manche, H., Gastineau, M., 2011. Asteroid mass determinations with INPOP planetary ephemerides. EPSC-DPS Joint Meeting 2011 , 1879.