Summary for : (617) Patroclus

DynT.TT.BT T.L B T.DDensity (g/cm^3)Δρ/ρDiameter (km)ΔD/DMass (kg)ΔM/MRefAvg.M
MBAP-- | --0.85 ± 0.20   (C)23 %144.9 ± 10.47.2 %1.36e+18 ± 1.09e+178 %SEVM
MBAP-- | --0.89 ± 0.19   (C)21 %143.0 ± 9.56.6 %1.36e+18 ± 1.09e+178 %Sw.avg
MBAX0.88 ± 0.17   (B)19 %143.1 ± 8.45.8 %1.36e+18 ± 1.10e+178 %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
(617) Patroclus140.60 ± 4.002.8 % NEATM2003D9 1.17 1
(617) Patroclus166.60 ± 4.802.9 % NEATM2003D912 20.37 2
(617) Patroclus140.91 ± 4.693.3 % STM2004D93 0.74 3
(617) Patroclus145.00 ± 15.0010.3 % NEATM2010D68 0.00 4
(617) Patroclus137.60 ± 1.901.4 % STM2010D64 14.91 5
(617) Patroclus164.22 ± 5.773.5 % NEATM2010D642 11.17 6
(617) Patroclus140.85 ± 3.362.4 % STM2011D83 1.48 7
(617) Patroclus185.10 ± 13.107.1 % NEATM2011D7312 9.40 8

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 = (144.9 ± 10.43) km   (ΔD/D = 7%, SNR = 13.90) Derived bulk density ρ = (0.85 ± 0.20) g/cm3   (Δρ/ρ = 23%, SNR = 4.3)


References
D9(2003):Fernández, Y.R., Sheppard, S.S., Jewitt, D.C., 2003. The Albedo Distribution of Jovian Trojan Asteroids. Astronomical Journal 126, 1563–1574.
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.
D68(2010):Mueller, M., Marchis, F., Emery, J.P., Harris, A.W., Mottola, S., Hestroffer, D., Berthier, J., di Martino, M., 2010. Eclipsing binary Trojan asteroid Patroclus: Thermal inertia from Spitzer observations. Icarus 205, 505–515.
D73(2011):Grav, T., Mainzer, A.K., Bauer, J., Masiero, J., Spahr, T., McMillan, R.S., Walker, R., Cutri, R., Wright, E., Eisenhardt, P.R.M., Blauvelt, E., DeBaun, E., Elsbury, D., Gautier, IV, T., Gomillion, S., Hand, E., Wilkins, A., 2011. WISE/NEOWISE Observations of the Jovian Trojans: Preliminary Results. Astrophysical Journal 742, 40.
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
(617) Patroclus1.36e+18 ± 1.09e+178 %BinImg 2006M590.00 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).

BinImg : Binary imaged at optical wavelength.


EVM mass average M = (1.360 ± 0.109) × 1018 kg   (ΔM/M = 8%, SNR = 12.5) Derived bulk density ρ = (0.85 ± 0.20) g/cm3   (Δρ/ρ = 23%, SNR = 4.3)


References
M59(2006):Marchis, F., Hestroffer, D., Descamps, P., Berthier, J., Bouchez, A.H., Campbell, R.D., Chin, J.C.Y., van Dam, M.A., Hartman, S.K., Johansson, E.M., Lafon, R.E., Le Mignant, D., de Pater, I., Stomski Jr., P.J., Summers, D.M., Vachier, F., Wizinowich, P.L., Wong, M.H., 2006. A low density of 0.8gcm^-3 for the Trojan binary asteroid 617 Patroclus. Nature 439, 565–567.