Summary for : (130) Elektra

DynT.TT.BT T.L B T.DDensity (g/cm^3)Δρ/ρDiameter (km)ΔD/DMass (kg)ΔM/MRefAvg.M
MBAGChCaa | ChCh1.43 ± 1.47   (E)103 %190.7 ± 9.75.1 %5.18e+18 ± 5.28e+18102 %SEVM
MBAGChCaa | ChCh0.24 ± 1.73   (E)717 %187.8 ± 9.04.8 %8.36e+17 ± 5.99e+18716 %Sw.avg
MBACh1.84 ± 0.22   (B)12 %189.6 ± 6.83.6 %6.60e+18 ± 4.00e+176 %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
(130) Elektra182.25 ± 11.806.5 % STM2004D93 0.51 1
(130) Elektra191.00 ± 2.001.0 % Img2006D34 0.03 2
(130) Elektra196.00 ± 11.005.6 % NEATM2008D44 0.24 3
(130) Elektra215.00 ± 15.007.0 % Img2008D4412 2.63 4
(130) Elektra158.82 ± 6.093.8 % STM2010D642 27.34 5
(130) Elektra200.51 ± 13.326.6 % NEATM2010D64 0.55 6
(130) Elektra191.00 ± 14.007.3 % MDM:LO2011D78 0.00 7
(130) Elektra183.02 ± 2.261.2 % STM2011D83 11.44 8
(130) Elektra198.92 ± 4.112.1 % NEATM2011D72 4.04 9

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).

Img : Apparent size in disk-resolved imaging. MDM:LO : Multi-Data Modeling: Lightcurves + Occultations. NEATM : Near-Earth Asteroid Thermal Model. STM : Standard Thermal Model.


EVM diam. average D = (190.7 ± 9.69) km   (ΔD/D = 5%, SNR = 19.67) Derived bulk density ρ = (1.43 ± 1.47) g/cm3   (Δρ/ρ = 103%, SNR = 1.0)


References
D34(2006):Marchis, F., Kaasalainen, M., Hom, E.F.Y., Berthier, J., Enriquez, J., Hestroffer, D., Le Mignant, D., de Pater, I., 2006. Shape, size and multiplicity of main-belt asteroids. Icarus 185, 39–63.
D44(2008):Marchis, F., Descamps, P., Berthier, J., Hestroffer, D., Vachier, F., Baek, M., Harris, A.W., Nesvorný, D., 2008b. Main belt binary asteroidal systems with eccentric mutual orbits. Icarus 195, 295–316.
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.
D78(2011):Ďurech, J., Kaasalainen, M., Herald, D., Dunham, D., Timerson, B., Hanuš, J., Frappa, E., Talbot, J., Hayamizu, T., Warner, B.D., Pilcher, F., Galád, A., 2011. Combining asteroid models derived by lightcurve inversion with asteroidal occultation silhouettes. Icarus 214, 652–670.
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
(130) Elektra6.60e+18 ± 3.98e+176 %BinImg 2008M7312.66 1
(130) Elektra2.22e+19 ± 1.60e+1972 %Ephem 2010M93121.13 2
(130) Elektra1.61e+19 ± 8.35e+1852 %Deflec 2011M97121.71 3
(130) Elektra1.00e+19 ± 6.55e+1866 %Deflec 2011M97120.54 4
(130) Elektra6.93e+18 ± 6.42e+1893 %Deflec 2011M97120.07 5
(130) Elektra1.34e+19 ± 1.30e+1997 %Deflec 2011M97120.40 6
(130) Elektra2.19e+17 ± 1.19e+1754 %Ephem 2011M100121740.55 7
(130) Elektra1.39e+19 ± 1.59e+1811 %OrbFitN 2014M123230.19 8
(130) Elektra5.81e+18 ± 1.98e+1834 %Ephem 2019M1260.10 9

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).

BinImg : Binary imaged at optical wavelength. Deflec : Orbital deflection (close encounter) of one or several test asteroids (classical LSQ). Ephem : Planetary ephemeris solution. OrbFitN : Simultaneous multi-asteroid astrometric orbit solution (similar to 'Ephem').


EVM mass average M = (5.184 ± 5.275) × 1018 kg   (ΔM/M = 102%, SNR = 1.0) Derived bulk density ρ = (1.43 ± 1.47) g/cm3   (Δρ/ρ = 103%, SNR = 1.0)


References
M73(2008):Marchis, F., Descamps, P., Berthier, J., Hestroffer, D., Vachier, F., Baek, M., Harris, A.W., Nesvorný, D., 2008. Main belt binary asteroidal systems with eccentric mutual orbits. Icarus 195, 295–316.
M93(2010):Fienga, A., Manche, H., Kuchynka, P., Laskar, J., Gastineau, M., 2010. INPOP10a. Scientific Notes.
M97(2011):Zielenbach, W., 2011. Mass Determination Studies of 104 Large Asteroids. Astronomical Journal 142, 120–128.
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.
M123(2014):Goffin, E., 2014. Astrometric asteroid masses: a simultaneous determination. Astronomy & Astrophysics, Volume 565, id.A56, 8 pp.
M126(2019):Fienga, A., et. al, 2019. INPOP19a planetary ephemeris. Notes Scientifiques et Techniques de l'Institut de mécanique céleste,