Summary for : (306) Unitas

DynT.TT.BT T.L B T.DDensity (g/cm^3)Δρ/ρDiameter (km)ΔD/DMass (kg)ΔM/MRefAvg.M
MBASS- | --7.28 ± 8.06   (E)111 %51.9 ± 4.07.7 %5.33e+17 ± 5.77e+17108 %SEVM
MBASS- | --7.91 ± 8.61   (E)109 %50.5 ± 1.93.8 %5.33e+17 ± 5.77e+17108 %Sw.avg
MBAS6.88 ± 7.57   (E)110 %52.9 ± 3.56.6 %5.33e+17 ± 5.77e+17108 %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
(306) Unitas46.70 ± 2.294.9 % STM2004D932 5.17 1
(306) Unitas56.00 ± 1.001.8 % TPM2009D57 16.73 2
(306) Unitas48.24 ± 1.382.9 % STM2010D642 7.07 3
(306) Unitas55.48 ± 2.815.1 % NEATM2010D64 1.61 4
(306) Unitas51.59 ± 1.442.8 % Occ2011D95 0.05 5
(306) Unitas56.00 ± 1.001.8 % MDM:LO2011D78 16.73 6
(306) Unitas53.00 ± 5.009.4 % MDM:LO2011D78 0.05 7
(306) Unitas46.24 ± 0.641.4 % STM2011D8312 78.47 8
(306) Unitas51.59 ± 6.3212.3 % NEATM2011D72 0.00 9

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).

MDM:LO : Multi-Data Modeling: Lightcurves + Occultations. NEATM : Near-Earth Asteroid Thermal Model. Occ : Stellar occultation. STM : Standard Thermal Model. TPM : Thermophysical Model.


EVM diam. average D = (51.9 ± 4.01) km   (ΔD/D = 8%, SNR = 12.96) Derived bulk density ρ = (7.28 ± 8.06) g/cm3   (Δρ/ρ = 111%, SNR = 0.9)


References
D57(2009):Delbo, M., Tanga, P., 2009. Thermal inertia of main belt asteroids smaller than 100 km from IRAS data. Planetary and Space Science 57, 259–265.
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.
D78(2011):Ďurech, J., Kaasalainen, M., Herald, D., Dunham, D., Timerson, B., Hanuš, J., Frappa, E., Talbot, J., Hayamizu, T., Warner, B.D., Pilcher, F., Galád, A., 2011. Combining asteroid models derived by lightcurve inversion with asteroidal occultation silhouettes. Icarus 214, 652–670.
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.
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
(306) Unitas5.33e+17 ± 5.77e+17108 %Ephem 2010M930.00 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).

Ephem : Planetary ephemeris solution.


EVM mass average M = (5.330 ± 5.770) × 1017 kg   (ΔM/M = 108%, SNR = 0.9) Derived bulk density ρ = (7.28 ± 8.06) g/cm3   (Δρ/ρ = 111%, SNR = 0.9)


References
M93(2010):Fienga, A., Manche, H., Kuchynka, P., Laskar, J., Gastineau, M., 2010. INPOP10a. Scientific Notes.