Summary for : (19) Fortuna

DynT.TT.BT T.L B T.DDensity (g/cm^3)Δρ/ρDiameter (km)ΔD/DMass (kg)ΔM/MRefAvg.M
MBAGCh- | -Ch1.92 ± 0.44   (C)23 %208.8 ± 4.12.0 %9.13e+18 ± 2.04e+1822 %SEVM
MBAGCh- | -Ch1.91 ± 0.42   (C)22 %206.2 ± 4.42.1 %8.75e+18 ± 1.82e+1821 %Sw.avg
MBACh1.85 ± 0.35   (A)19 %206.9 ± 6.53.1 %8.60e+18 ± 1.46e+1817 %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
(19) Fortuna210.10 ± 3.771.8 % Occ2011D95 0.12 1
(19) Fortuna209.60 ± 4.962.4 % Img-TE2011D76 0.03 2
(19) Fortuna199.66 ± 3.011.5 % TPM2011D83 9.23 3
(19) Fortuna223.00 ± 43.5919.5 % NEATM2011D72 0.11 4
(19) Fortuna211.00 ± 4.001.9 % ADAM2017D100 0.30 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).

ADAM : All-Data Asteroid Modeling. Img-TE : Triaxial ellipsoid model from images. NEATM : Near-Earth Asteroid Thermal Model. Occ : Stellar occultation. TPM : Thermophysical Model.


EVM diam. average D = (208.8 ± 4.12) km   (ΔD/D = 2%, SNR = 50.69) Derived bulk density ρ = (1.92 ± 0.44) g/cm3   (Δρ/ρ = 23%, SNR = 4.3)


References
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.
D76(2011):Drummond, J.D., Merline, W.J., Conrad, A., Christou, J., Tamblyn, P., Carry, B., 2011. Asteroid (19) Fortuna: Triaxial Ellipsoid Dimensions and Rotational Pole with AO at Gemini North, in: AAS/Division for Planetary Sciences Meeting Abstracts
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.
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
(19) Fortuna1.27e+19 (+4.97e+17 / -4.97e+17)4 % / 4 %Deflec 2008M721251.63 1
(19) Fortuna4.02e+18 (+3.98e+17 / -3.98e+17)10 % / 10 %Ephem 2009M8012164.78 2
(19) Fortuna6.94e+18 (+6.94e+17 / -6.94e+17)10 % / 10 %Ephem 2009M869.95 3
(19) Fortuna6.37e+18 (+2.90e+18 / -2.90e+18)46 % / 46 %Deflec 2010M920.91 4
(19) Fortuna8.31e+18 (+7.16e+17 / -7.16e+17)9 % / 9 %Deflec 2011M951.31 5
(19) Fortuna6.37e+18 (+1.05e+18 / -1.05e+18)16 % / 16 %Ephem 2011M1036.90 6
(19) Fortuna1.00e+19 (+1.08e+18 / -1.08e+18)11 % / 11 %Deflec 2011M970.65 7
(19) Fortuna1.02e+19 (+9.47e+17 / -9.47e+17)9 % / 9 %Deflec 2011M971.28 8
(19) Fortuna1.01e+19 (+9.35e+17 / -9.35e+17)9 % / 9 %Deflec 2011M971.08 9
(19) Fortuna1.05e+19 (+1.23e+18 / -1.23e+18)12 % / 12 %Deflec 2011M971.24 10
(19) Fortuna8.35e+18 (+5.97e+17 / -5.97e+17)7 % / 7 %Ephem 2011M1001.70 11
(19) Fortuna8.95e+18 (+1.99e+17 / -1.99e+17)2 % / 2 %OrbFitN 2014M1230.83 12
(19) Fortuna1.24e+19 (+9.27e+17 / -9.27e+17)7 % / 7 %Deflec 2017M125212.38 13
(19) Fortuna1.11e+19 (+9.76e+17 / -9.76e+17)9 % / 9 %Deflec 2017M12524.08 14
(19) Fortuna1.06e+19 (+1.57e+18 / -1.57e+18)15 % / 15 %Deflec 2017M12520.88 15
(19) Fortuna1.48e+19 (+3.02e+18 / -3.02e+18)20 % / 20 %Deflec 2017M12523.49 16
(19) Fortuna7.06e+18 (+1.61e+18 / -1.61e+18)23 % / 23 %Deflec 2017M12521.65 17
(19) Fortuna7.30e+18 (+2.70e+18 / -2.70e+18)37 % / 37 %Deflec 2017M12520.46 18
(19) Fortuna1.10e+19 (+5.55e+17 / -5.55e+17)5 % / 5 %Deflec 2017M125311.37 19
(19) Fortuna2.80e+18 (+2.86e+18 / -1.68e+18)102 % / 60 %Defl-MC 2017M12727.77 20
(19) Fortuna2.21e+19 (+6.16e+18 / -7.02e+18)28 % / 32 %Defl-MC 2017M12723.87 21
(19) Fortuna8.28e+18 (+4.88e+17 / -4.88e+17)6 % / 6 %Ephem 2019M1263.06 22
(19) Fortuna7.77e+18 (+4.20e+18 / -3.90e+18)54 % / 50 %Defl-MC 2020M1280.11 23

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).
4: Values with asymmetric errors are currently just diplayed but disabled (unchecked) for the average calculation.

Defl-MC : Orbital deflection (close encounter) of one or several test asteroids (Markov Chain Monte Carlo, MCMC). 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 = (9.129 ± 2.043) × 1018 kg   (ΔM/M = 22%, SNR = 4.5) Derived bulk density ρ = (1.92 ± 0.44) g/cm3   (Δρ/ρ = 23%, SNR = 4.3)


References
M72(2008):Baer, J., Milani, A., Chesley, S.R., Matson, R.D., 2008. An Observational Error Model, and Application to Asteroid Mass Determination, in: Bulletin of the American Astronomical Society, p. 493.
M80(2009):Fienga, A., Laskar, J., Morley, T., Manche, H., Kuchynka, P., Le Poncin-Lafitte, C., Budnik, F., Gastineau, M., Somenzi, L., 2009. INPOP08, a 4-D planetary ephemeris: from asteroid and time-scale computations to ESA Mars Express and Venus Express contributions. Astronomy and Astrophysics 507, 1675–1686.
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.
M92(2010):Somenzi, L., Fienga, A., Laskar, J., Kuchynka, P., 2010. Determination of asteroid masses from their close encounters with Mars. Planetary and Space Science 58, 858–863.
M95(2011):Baer, J., Chesley, S.R., Matson, R.D., 2011. Astrometric Masses of 26 Asteroids and Observations on Asteroid Porosity. Astronomical Journal 141, 143–155.
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.
M103(2011):Konopliv, A.S., Asmar, S.W., Folkner, W.M., Karatekin, Ö., Nunes, D.C., Smrekar, S.E., Yoder, C.F., Zuber, M.T., 2011. Mars high resolution gravity fields from MRO, Mars seasonal gravity, and other dynamical parameters. Icarus 211, 401–428.
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,
M127(2017):Siltala, L., Granvik, M., 2017. Asteroid mass estimation using Markov-chain Monte Carlo. Icarus 297 (November 2017), 149-159. https://doi.org/10.1016/j.icarus.2017.06.028
M128(2020):Siltala, L., Granvik, M., 2020. Asteroid mass estimation with the robust adaptive Metropolis algorithm. Astronomy & Astrophysics, 633, A46.