Summary for : (243) Ida

DynT.TT.BT T.L B T.DDensity (g/cm^3)Δρ/ρDiameter (km)ΔD/DMass (kg)ΔM/MRefAvg.M
MBASS- | -Sw2.96 ± 0.69   (C)23 %29.0 ± 2.27.5 %3.78e+16 ± 1.99e+155 %SEVM
MBASS- | -Sw2.95 ± 1.05   (C)36 %29.0 ± 3.411.7 %3.78e+16 ± 1.99e+155 %Sw.avg
MBAS2.35 ± 0.29   (A)12 %31.3 ± 1.23.8 %3.78e+16 ± 2.00e+155 %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
(243) Ida27.98 ± 3.2011.4 % STM2004D9312 0.10 1
(243) Ida25.31 ± 1.636.4 % STM2010D642 5.09 2
(243) Ida36.23 ± 6.2517.3 % NEATM2010D642 1.34 3
(243) Ida31.29 ± 1.203.8 % IAU2011D75 3.69 4
(243) Ida29.00 ± 0.431.5 % STM2011D8312 0.00 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 = (29.0 ± 2.18) km   (ΔD/D = 8%, SNR = 13.27) Derived bulk density ρ = (2.96 ± 0.69) g/cm3   (Δρ/ρ = 23%, SNR = 4.3)


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
(243) Ida3.78e+16 ± 1.99e+155 %BinImg 1997M130.00 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 = (3.780 ± 0.199) × 1016 kg   (ΔM/M = 5%, SNR = 19.0) Derived bulk density ρ = (2.96 ± 0.69) g/cm3   (Δρ/ρ = 23%, SNR = 4.3)


References
M13(1997):Petit, J.M., Durda, D.D., Greenberg, R., Hurford, T.A., Geissler, P.E., 1997. The Long-Term Dynamics of Dactyl's Orbit. Icarus 130, 177–197.