Summary for : (804) Hispania

DynT.TT.BT T.L B T.DDensity (g/cm^3)Δρ/ρDiameter (km)ΔD/DMass (kg)ΔM/MRefAvg.M
MBAPCCC | C-2.93 ± 1.11   (C)38 %147.8 ± 8.45.7 %4.94e+18 ± 1.67e+1834 %SEVM
MBAPCCC | C-2.27 ± 0.88   (C)39 %147.1 ± 12.78.7 %3.79e+18 ± 1.08e+1829 %Sw.avg
MBAC2.93 ± 1.06   (C)36 %148.3 ± 4.12.8 %5.00e+18 ± 1.78e+1836 %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
(804) Hispania157.58 ± 5.803.7 % STM2004D93 2.85 1
(804) Hispania122.00 ± 6.505.3 % Img2006D341 15.73 2
(804) Hispania147.73 ± 6.804.6 % STM2010D64 0.00 3
(804) Hispania182.36 ± 10.405.7 % NEATM2010D64 11.06 4
(804) Hispania147.00 ± 1.921.3 % STM2011D83 0.17 5
(804) Hispania146.97 ± 3.402.3 % NEATM2011D72 0.06 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).

Img : Apparent size in disk-resolved imaging. NEATM : Near-Earth Asteroid Thermal Model. STM : Standard Thermal Model.


0246120140160180
Diameter estimates for : (804) HispaniaDiameter in km

EVM diam. average D = (147.8 ± 8.38) km   (ΔD/D = 6%, SNR = 17.63) Derived bulk density ρ = (2.93 ± 1.11) g/cm3   (Δρ/ρ = 38%, SNR = 2.6)


References
D34(2006):Marchis, F., Kaasalainen, M., Hom, E.F.Y., Berthier, J., Enriquez, J., Hestroffer, D., Le Mignant, D., de Pater, I., 2006. Shape, size and multiplicity of main-belt asteroids. Icarus 185, 39–63.
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.

Mass estimates

DesignationMass / Err (kg)ΔM/MMethodYearRefNχ2Use
(804) Hispania9.94e+18 ± 7.96e+1880 %Deflec 1992M30.39 1
(804) Hispania9.74e+18 ± 5.37e+1855 %Deflec 1997M1180.80 2
(804) Hispania4.37e+18 ± 1.79e+1841 %Deflec 2005M1190.10 3
(804) Hispania4.02e+18 ± 8.55e+1721 %Deflec 2008M721.17 4
(804) Hispania5.00e+18 ± 3.62e+1872 %Ephem 2010M930.00 5
(804) Hispania3.48e+18 ± 7.96e+1723 %Deflec 2011M953.39 6
(804) Hispania8.56e+18 ± 4.71e+1855 %Deflec 2011M970.59 7
(804) Hispania5.03e+18 ± 2.79e+1855 %Deflec 2011M970.00 8
(804) Hispania5.57e+18 ± 2.77e+1850 %Deflec 2011M970.05 9
(804) Hispania8.65e+18 ± 3.72e+1843 %Deflec 2011M970.99 10
(804) Hispania6.15e+18 ± 2.39e+1839 %Ephem 2011M1000.25 11
(804) Hispania2.78e+18 ± 5.97e+1721 %OrbFitN 2014M12313.10 12
(804) Hispania5.03e+18 ± 1.23e+1824 %Deflec 2017M1250.00 13
(804) Hispania4.38e+18 ± 1.53e+1835 %Ephem 2019M1260.14 14

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').


0510150.5×10​19​1×10​19​1.5×10​19​
Mass estimates for : (804) HispaniaMass in kg

EVM mass average M = (4.945 ± 1.673) × 1018 kg   (ΔM/M = 34%, SNR = 3.0) Derived bulk density ρ = (2.93 ± 1.11) g/cm3   (Δρ/ρ = 38%, SNR = 2.6)


References
M3(1992):Landgraf, W., 1992. A Determination of the Mass of (704) Interamnia from Observations of (993) Moultona, in: S. Ferraz-Mello (Ed.), Chaos, Resonance,and Collective Dynamical Phenomena in the Solar System, pp. 179–183.
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.
M93(2010):Fienga, A., Manche, H., Kuchynka, P., Laskar, J., Gastineau, M., 2010. INPOP10a. Scientific Notes.
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.
M118(1997):Orelllana, R. B., 1997. Determinación de la masa del asteroide (804) Hispania. Boletín de la Asociación Argentina de Astronomía, vol.41, p.16-16.
M119(2005):Kretlow, M., 2005. https://astro.kretlow.de .
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,