Summary for : (27) Euterpe

DynT.TT.BT T.L B T.DDensity (g/cm^3)Δρ/ρDiameter (km)ΔD/DMass (kg)ΔM/MRefAvg.M
MBASSS | LS4.39 ± 2.43   (D)55 %105.0 ± 6.86.4 %2.66e+18 ± 1.38e+1852 %SEVM
MBASSS | LS2.33 ± 2.27   (D)98 %105.6 ± 8.07.6 %1.43e+18 ± 1.36e+1895 %Sw.avg
MBAS2.69 ± 1.71   (D)64 %105.8 ± 7.26.8 %1.67e+18 ± 1.01e+1860 %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)

Object is a Gaia target for mass determination !

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
(27) Euterpe96.80 ± 2.202.3 % Occ2011D952 13.76 1
(27) Euterpe109.79 ± 1.531.4 % TPM2011D83 9.96 2
(27) Euterpe118.00 ± 22.3018.9 % NEATM2011D72 0.34 3

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. Occ : Stellar occultation. TPM : Thermophysical Model.


EVM diam. average D = (105.0 ± 6.77) km   (ΔD/D = 6%, SNR = 15.51) Derived bulk density ρ = (4.39 ± 2.43) g/cm3   (Δρ/ρ = 55%, SNR = 1.8)


References
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.
D95(2011):Dunham, D.W., Herald, D., Frappa, E., Hayamizu, T., Talbot, J., Timerson, B., 2011. Asteroid Occultations. NASA Planetary Data System. EAR-A-3-RDR-OCCULTATIONS-V9.0.

Mass estimates

DesignationMass / Err (kg)ΔM/MMethodYearRefNχ2Use
(27) Euterpe1.26e+18 ± 1.26e+1710 %Ephem 2009M86122.93 1
(27) Euterpe4.35e+18 ± 1.98e+1846 %Deflec 2011M970.73 2
(27) Euterpe2.09e+18 ± 1.47e+1870 %Deflec 2011M970.15 3
(27) Euterpe2.20e+18 ± 1.46e+1866 %Deflec 2011M970.10 4
(27) Euterpe5.59e+18 ± 3.07e+1855 %Deflec 2011M970.91 5
(27) Euterpe1.99e+18 ± 3.98e+1720 %OrbFitN 2014M1232.83 6
(27) Euterpe4.32e+18 ± 1.21e+1828 %Deflec 2017M1251.88 7
(27) Euterpe4.34e+18 ± 8.89e+1720 %Ephem 2019M1263.60 8

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).

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 = (2.657 ± 1.381) × 1018 kg   (ΔM/M = 52%, SNR = 1.9) Derived bulk density ρ = (4.39 ± 2.43) g/cm3   (Δρ/ρ = 55%, SNR = 1.8)


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.
M97(2011):Zielenbach, W., 2011. Mass Determination Studies of 104 Large Asteroids. Astronomical Journal 142, 120–128.
M123(2014):Goffin, E., 2014. Astrometric asteroid masses: a simultaneous determination. Astronomy & Astrophysics, Volume 565, id.A56, 8 pp.
M125(2017):Baer, J., Chesley, S.R., 2017. Simultaneous Mass Determination for Gravitationally Coupled Asteroids. The Astronomical Journal, Volume 154, Issue 2, article id. 76, 11 pp.
M126(2019):Fienga, A., et. al, 2019. INPOP19a planetary ephemeris. Notes Scientifiques et Techniques de l'Institut de mécanique céleste,