Summary for : (98) Ianthe

DynT.TT.BT T.L B T.DDensity (g/cm^3)Δρ/ρDiameter (km)ΔD/DMass (kg)ΔM/MRefAvg.M
MBACGChCaa | Ch-1.45 ± 0.34   (C)23 %105.5 ± 3.43.2 %8.90e+17 ± 1.88e+1721 %SEVM
MBACGChCaa | Ch-1.36 ± 0.57   (C)42 %105.5 ± 3.02.9 %8.34e+17 ± 3.42e+1741 %Sw.avg
MBACh1.42 ± 0.35   (C)25 %106.2 ± 3.83.5 %8.93e+17 ± 1.99e+1722 %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
(98) Ianthe104.44 ± 1.791.7 % STM2004D93 0.37 1
(98) Ianthe101.97 ± 3.673.6 % STM2010D64 0.94 2
(98) Ianthe114.30 ± 5.234.6 % NEATM2010D642 2.81 3
(98) Ianthe104.23 ± 1.281.2 % STM2011D83 1.03 4
(98) Ianthe110.87 ± 2.312.1 % NEATM2011D722 5.35 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).

NEATM : Near-Earth Asteroid Thermal Model. STM : Standard Thermal Model.



EVM diam. average D = (105.5 ± 3.42) km   (ΔD/D = 3%, SNR = 30.85) Derived bulk density ρ = (1.45 ± 0.34) 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.
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.
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
(98) Ianthe8.24e+17 ± 8.24e+1610 %Ephem 2009M860.64 1
(98) Ianthe1.47e+18 ± 6.90e+1747 %Ephem 2011M1000.71 2
(98) Ianthe8.69e+17 ± 4.03e+1746 %Ephem 2019M1260.00 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.



EVM mass average M = (8.897 ± 1.881) × 1017 kg   (ΔM/M = 21%, SNR = 4.7) Derived bulk density ρ = (1.45 ± 0.34) g/cm3   (Δρ/ρ = 23%, SNR = 4.3)



References
M86(2009):Folkner, W.M., Williams, J.G., Boggs, D.H., 2009. The planetary and lunar ephemeris de 421. IPN Progress Report 42, 1–34.
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.
M126(2019):Fienga, A., et. al, 2019. INPOP19a planetary ephemeris. Notes Scientifiques et Techniques de l'Institut de mécanique céleste,