Summary for : (275) Sapientia

DynT.TT.BT T.L B T.DDensity (g/cm^3)Δρ/ρDiameter (km)ΔD/DMass (kg)ΔM/MRefAvg.M
MBAXC- | --4.69 ± 1.12   (C)24 %95.5 ± 1.11.2 %2.14e+18 ± 5.06e+1724 %SEVM
MBAXC- | --4.79 ± 1.15   (C)24 %95.5 ± 1.11.2 %2.18e+18 ± 5.20e+1724 %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
(275) Sapientia95.48 ± 1.111.2 % NEATM2019D103 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).

NEATM : Near-Earth Asteroid Thermal Model.


EVM diam. average D = (95.5 ± 1.11) km   (ΔD/D = 1%, SNR = 85.86) Derived bulk density ρ = (4.69 ± 1.12) g/cm3   (Δρ/ρ = 24%, SNR = 4.2)


References
D103(2019):Mainzer, A., Bauer, J., Cutri, R., et al., Eds., 2019. NEOWISE Diameters and Albedos V2.0. urn:nasa:pds:neowise_diameters_albedos::2.0. NASA Planetary Data System.

Mass estimates

DesignationMass / Err (kg)ΔM/MMethodYearRefNχ2Use
(275) Sapientia2.58e+18 ± 5.97e+1723 %OrbFitN 2014M1230.57 1
(275) Sapientia1.57e+18 ± 7.41e+1747 %Ephem 2019M1260.59 2

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. OrbFitN : Simultaneous multi-asteroid astrometric orbit solution (similar to 'Ephem').


EVM mass average M = (2.135 ± 0.506) × 1018 kg   (ΔM/M = 24%, SNR = 4.2) Derived bulk density ρ = (4.69 ± 1.12) g/cm3   (Δρ/ρ = 24%, SNR = 4.2)


References
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,