SiMDA»Main

Summary for : (804) Hispania

Dyn	T.T	T.B	T T.L B	T.D	Density (g/cm^3)	Δρ/ρ	Diameter (km)	ΔD/D	Mass (kg)	ΔM/M	Ref	Avg.M
MBA	PC	C	C \| C	-	2.93 ± 1.11 (C)	38 %	147.8 ± 8.4	5.7 %	4.94e+18 ± 1.67e+18	34 %	S	EVM
MBA	PC	C	C \| C	-	2.27 ± 0.88 (C)	39 %	147.1 ± 12.7	8.7 %	3.79e+18 ± 1.08e+18	29 %	S	w.avg
MBA	C				2.93 ± 1.06 (C)	36 %	148.3 ± 4.1	2.8 %	5.00e+18 ± 1.78e+18	36 %	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

Designation	Diameter / Err (km)	ΔD/D	Method	Year	Ref	N	χ²	Use
(804) Hispania	157.58 ± 5.80	3.7 %	STM	2004	D93		2.85	1
(804) Hispania	122.00 ± 6.50	5.3 %	Img	2006	D34	1	15.73	2
(804) Hispania	147.73 ± 6.80	4.6 %	STM	2010	D64		0.00	3
(804) Hispania	182.36 ± 10.40	5.7 %	NEATM	2010	D64		11.06	4
(804) Hispania	147.00 ± 1.92	1.3 %	STM	2011	D83		0.17	5
(804) Hispania	146.97 ± 3.40	2.3 %	NEATM	2011	D72		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.

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

Designation	Mass / Err (kg)	ΔM/M	Method	Year	Ref	χ²	Use
(804) Hispania	9.94e+18 ± 7.96e+18	80 %	Deflec	1992	M3	0.39	1
(804) Hispania	9.74e+18 ± 5.37e+18	55 %	Deflec	1997	M118	0.80	2
(804) Hispania	4.37e+18 ± 1.79e+18	41 %	Deflec	2005	M119	0.10	3
(804) Hispania	4.02e+18 ± 8.55e+17	21 %	Deflec	2008	M72	1.17	4
(804) Hispania	5.00e+18 ± 3.62e+18	72 %	Ephem	2010	M93	0.00	5
(804) Hispania	3.48e+18 ± 7.96e+17	23 %	Deflec	2011	M95	3.39	6
(804) Hispania	8.56e+18 ± 4.71e+18	55 %	Deflec	2011	M97	0.59	7
(804) Hispania	5.03e+18 ± 2.79e+18	55 %	Deflec	2011	M97	0.00	8
(804) Hispania	5.57e+18 ± 2.77e+18	50 %	Deflec	2011	M97	0.05	9
(804) Hispania	8.65e+18 ± 3.72e+18	43 %	Deflec	2011	M97	0.99	10
(804) Hispania	6.15e+18 ± 2.39e+18	39 %	Ephem	2011	M100	0.25	11
(804) Hispania	2.78e+18 ± 5.97e+17	21 %	OrbFitN	2014	M123	13.10	12
(804) Hispania	5.03e+18 ± 1.23e+18	24 %	Deflec	2017	M125	0.00	13
(804) Hispania	4.38e+18 ± 1.53e+18	35 %	Ephem	2019	M126	0.14	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').

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,

Size, Mass and Density of Asteroids (SiMDA)

Summary for : (804) Hispania

Diameter estimates

Mass estimates