Summary for : (51) Nemausa

DynT.TT.BT T.L B T.DDensity (g/cm^3)Δρ/ρDiameter (km)ΔD/DMass (kg)ΔM/MRefAvg.M
MBACUCh- | -Cgh1.97 ± 0.72   (C)37 %148.0 ± 4.93.3 %3.34e+18 ± 1.18e+1835 %SEVM
MBACUCh- | -Cgh1.55 ± 0.50   (C)32 %148.1 ± 4.73.2 %2.64e+18 ± 8.07e+1731 %Sw.avg
MBACh1.43 ± 0.50   (C)35 %148.9 ± 3.62.4 %2.48e+18 ± 8.60e+1735 %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
(51) Nemausa147.86 ± 2.401.6 % STM2004D93 0.00 1
(51) Nemausa155.86 ± 3.982.6 % STM2010D64 3.92 2
(51) Nemausa164.42 ± 6.654.0 % NEATM2010D642 6.11 3
(51) Nemausa147.17 ± 1.691.1 % STM2011D83 0.23 4
(51) Nemausa142.60 ± 12.508.8 % NEATM2011D72 0.19 5
(51) Nemausa144.00 ± 3.002.1 % ADAM2017D100 1.76 6

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).

ADAM : All-Data Asteroid Modeling. NEATM : Near-Earth Asteroid Thermal Model. STM : Standard Thermal Model.



EVM diam. average D = (148.0 ± 4.88) km   (ΔD/D = 3%, SNR = 30.35) Derived bulk density ρ = (1.97 ± 0.72) g/cm3   (Δρ/ρ = 37%, SNR = 2.7)



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.
D100(2017):Hanuš, J., Viikinkoski, M., Marchis, F., et al., 2017. Volumes and bulk densities of forty asteroids from ADAM shape modeling. Astronomy and Astrophysics 601, A114 (2017). DOI: 10.1051/0004-6361/201629956


Mass estimates

DesignationMass / Err (kg)ΔM/MMethodYearRefNχ2Use
(51) Nemausa2.16e+18 ± 2.16e+1710 %Ephem 2009M86230.01 1
(51) Nemausa1.44e+18 ± 8.37e+1758 %Ephem 2010M935.17 2
(51) Nemausa4.55e+18 ± 2.72e+1860 %Deflec 2011M9720.20 3
(51) Nemausa3.39e+18 ± 1.62e+1848 %Deflec 2011M9720.00 4
(51) Nemausa3.36e+18 ± 1.62e+1848 %Deflec 2011M9720.00 5
(51) Nemausa4.25e+18 ± 2.08e+1849 %Deflec 2011M9720.19 6
(51) Nemausa5.63e+18 ± 1.30e+1823 %Ephem 2011M100123.09 7
(51) Nemausa2.78e+18 ± 3.98e+1714 %OrbFitN 2014M1231.98 8
(51) Nemausa5.71e+18 ± 8.83e+1715 %Deflec 2017M12527.17 9
(51) Nemausa4.53e+18 ± 1.71e+1838 %Deflec 2017M12520.48 10
(51) Nemausa2.13e+18 ± 9.56e+1745 %Deflec 2017M12521.62 11
(51) Nemausa4.12e+18 ± 6.06e+1715 %Deflec 2017M12531.63 12
(51) Nemausa2.81e+18 ± 9.44e+1734 %Ephem 2019M1260.32 13

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 = (3.343 ± 1.176) × 1018 kg   (ΔM/M = 35%, SNR = 2.8) Derived bulk density ρ = (1.97 ± 0.72) g/cm3   (Δρ/ρ = 37%, SNR = 2.7)



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.
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,