Summary for : (386) Siegena

DynT.TT.BT T.L B T.DDensity (g/cm^3)Δρ/ρDiameter (km)ΔD/DMass (kg)ΔM/MRefAvg.M
MBACCCaa | Ch-5.07 ± 3.51   (D)69 %170.9 ± 15.99.3 %1.33e+19 ± 8.41e+1863 %SEVM
MBACCCaa | Ch-8.33 ± 2.85   (X)34 %170.6 ± 9.95.8 %2.16e+19 ± 6.38e+1829 %Sw.avg
MBACh3.14 ± 0.76   (C)24 %170.4 ± 8.44.9 %8.14e+18 ± 1.58e+1819 %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
(386) Siegena165.00 ± 2.701.6 % STM2004D93 4.85 1
(386) Siegena145.67 ± 3.772.6 % STM2010D642 44.95 2
(386) Siegena186.51 ± 9.515.1 % NEATM2010D64 2.68 3
(386) Siegena173.99 ± 12.897.4 % Occ2011D95 0.06 4
(386) Siegena201.16 ± 3.521.7 % STM2011D8312 73.68 5
(386) Siegena167.00 ± 5.003.0 % ADAM2017D100 0.62 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. Occ : Stellar occultation. STM : Standard Thermal Model.


EVM diam. average D = (170.9 ± 15.91) km   (ΔD/D = 9%, SNR = 10.75) Derived bulk density ρ = (5.07 ± 3.51) g/cm3   (Δρ/ρ = 69%, SNR = 1.4)


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.
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.
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
(386) Siegena2.35e+19 ± 4.18e+172 %Ephem 2010M9312599.10 1
(386) Siegena6.30e+18 ± 9.57e+18152 %Deflec 2011M9720.53 2
(386) Siegena7.80e+18 ± 4.21e+1854 %Deflec 2011M971.69 3
(386) Siegena7.70e+18 ± 4.17e+1854 %Deflec 2011M971.78 4
(386) Siegena1.16e+19 ± 9.19e+1879 %Deflec 2011M970.03 5
(386) Siegena3.70e+18 ± 1.43e+1839 %Ephem 2019M12644.79 6

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.


EVM mass average M = (1.327 ± 0.841) × 1019 kg   (ΔM/M = 63%, SNR = 1.6) Derived bulk density ρ = (5.07 ± 3.51) g/cm3   (Δρ/ρ = 69%, SNR = 1.4)


References
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.
M126(2019):Fienga, A., et. al, 2019. INPOP19a planetary ephemeris. Notes Scientifiques et Techniques de l'Institut de mécanique céleste,