Summary for : (939) Isberga

DynT.TT.BT T.L B T.DDensity (g/cm^3)Δρ/ρDiameter (km)ΔD/DMass (kg)ΔM/MRefAvg.M
MBAS-- | --3.53 ± 3.36   (D)95 %12.4 ± 0.65.0 %3.52e+15 ± 3.32e+1594 %SEVM
MBAS-- | --3.53 ± 3.36   (D)95 %12.4 ± 0.65.0 %3.52e+15 ± 3.32e+1594 %Sw.avg

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
(939) Isberga12.40 (+0.83 / -0.40)6.7 % / 3.2 % MDM:LY2015D101 0.00 1

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).
3: Values with asymmetric errors are currently just diplayed but disabled (unchecked) for the average calculation.

MDM:LY : Multi-Data Modeling: Lightcurves + Interferometry.


EVM diam. average D = (12.4 ± 0.62) km   (ΔD/D = 5%, SNR = 20.16) Derived bulk density ρ = (3.53 ± 3.36) g/cm3   (Δρ/ρ = 95%, SNR = 1.0)


References
D101(2015):Carry, B., Matter, A., Scheirich, P., et al., 2015. The Small Binary Asteroid (939) Isberga. Icarus 248 (March 2015), 516–525. DOI: http://dx.doi.org/10.1016/j.icarus.2014.11.002. NOTE: Authors derived ρ = 2.91 (+1.72,-2.01) g/cm^3

Mass estimates

DesignationMass / Err (kg)ΔM/MMethodYearRefNχ2Use
(939) Isberga3.52e+15 (+3.90e+15 / -2.73e+15)111 % / 78 %BinImg 2015M1290.00 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).
4: Values with asymmetric errors are currently just diplayed but disabled (unchecked) for the average calculation.

BinImg : Binary imaged at optical wavelength.


EVM mass average M = (3.520 ± 3.315) × 1015 kg   (ΔM/M = 94%, SNR = 1.1) Derived bulk density ρ = (3.53 ± 3.36) g/cm3   (Δρ/ρ = 95%, SNR = 1.0)


References
M129(2015):Carry, B., Matter, A., Scheirich, P., et al., 2015. The Small Binary Asteroid (939) Isberga. Icarus 248 (March 2015), 516–525. https://doi.org/10.1016/j.icarus.2014.11.002