Summary for : (488) Kreusa

DynT.TT.BT T.L B T.DDensity (g/cm^3)Δρ/ρDiameter (km)ΔD/DMass (kg)ΔM/MRefAvg.M
MBAC-Caa | Ch-1.56 ± 1.28   (D)82 %158.4 ± 8.75.5 %3.25e+18 ± 2.62e+1881 %SEVM
MBAC-Caa | Ch-1.12 ± 1.64   (E)147 %166.9 ± 6.64.0 %2.72e+18 ± 3.98e+18146 %Sw.avg
MBACh1.10 ± 0.54   (C)49 %162.3 ± 9.55.9 %2.48e+18 ± 1.14e+1846 %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
(488) Kreusa150.13 ± 6.404.3 % STM2004D93 1.69 1
(488) Kreusa155.99 ± 6.944.4 % STM2010D64 0.13 2
(488) Kreusa161.59 ± 7.394.6 % NEATM2010D64 0.18 3
(488) Kreusa172.55 ± 2.541.5 % STM2011D832 30.82 4
(488) Kreusa150.00 ± 11.327.5 % NEATM2011D72 0.56 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 = (158.4 ± 8.75) km   (ΔD/D = 6%, SNR = 18.12) Derived bulk density ρ = (1.56 ± 1.28) g/cm3   (Δρ/ρ = 82%, SNR = 1.2)



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
(488) Kreusa2.46e+18 ± 2.46e+1710 %Ephem 2009M8610.21 1
(488) Kreusa1.24e+19 ± 1.10e+1989 %Ephem 2010M9320.69 2
(488) Kreusa1.60e+19 ± 6.15e+1838 %Deflec 2011M97124.30 3
(488) Kreusa2.29e+18 ± 6.62e+1729 %Deflec 2011M972.08 4
(488) Kreusa2.19e+18 ± 6.68e+1731 %Deflec 2011M972.50 5
(488) Kreusa8.25e+17 ± 1.37e+191661 %Deflec 2011M9720.03 6
(488) Kreusa9.77e+18 ± 2.70e+1828 %Ephem 2011M100125.84 7
(488) Kreusa7.36e+18 ± 9.94e+1714 %OrbFitN 2014M123217.11 8
(488) Kreusa3.77e+18 ± 1.54e+1841 %Ephem 2019M1260.12 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).

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 = (3.246 ± 2.615) × 1018 kg   (ΔM/M = 81%, SNR = 1.2) Derived bulk density ρ = (1.56 ± 1.28) g/cm3   (Δρ/ρ = 82%, SNR = 1.2)



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.
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,