Summary for : (444) Gyptis

DynT.TT.BT T.L B T.DDensity (g/cm^3)Δρ/ρDiameter (km)ΔD/DMass (kg)ΔM/MRefAvg.M
MBACC- | -C3.90 ± 1.99   (D)51 %162.3 ± 7.74.8 %8.72e+18 ± 4.28e+1849 %SEVM
MBACC- | -C1.69 ± 1.68   (D)99 %157.7 ± 6.03.8 %3.47e+18 ± 3.43e+1899 %Sw.avg
MBAC4.55 ± 1.23   (C)27 %164.6 ± 2.61.6 %1.06e+19 ± 2.80e+1826 %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
(444) Gyptis163.08 ± 10.006.1 % STM2004D93 0.01 1
(444) Gyptis129.00 ± 7.505.8 % Img2006D3412 19.67 2
(444) Gyptis159.34 ± 13.678.6 % STM2010D64 0.05 3
(444) Gyptis167.73 ± 6.774.0 % NEATM2010D64 0.65 4
(444) Gyptis166.02 ± 6.654.0 % STM2011D83 0.32 5
(444) Gyptis163.00 ± 12.607.7 % NEATM2011D72 0.00 6
(444) Gyptis163.00 ± 22.1313.6 % NEATM2011D72 0.00 7

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 = (162.3 ± 7.73) km   (ΔD/D = 5%, SNR = 20.99) Derived bulk density ρ = (3.90 ± 1.99) g/cm3   (Δρ/ρ = 51%, SNR = 2.0)


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
(444) Gyptis7.16e+18 ± 3.18e+1844 %Deflec 2001M260.24 1
(444) Gyptis1.25e+19 ± 2.39e+1819 %Deflec 2004M4222.50 2
(444) Gyptis1.59e+19 ± 1.11e+1970 %Ephem 2010M9320.42 3
(444) Gyptis1.12e+19 ± 4.54e+1841 %Deflec 2011M9720.30 4
(444) Gyptis1.22e+19 ± 2.70e+1822 %Deflec 2011M9721.66 5
(444) Gyptis1.12e+19 ± 2.67e+1824 %Deflec 2011M9720.86 6
(444) Gyptis4.09e+18 ± 6.20e+18152 %Deflec 2011M9720.56 7
(444) Gyptis1.39e+18 ± 5.97e+1743 %OrbFitN 2014M123150.81 8
(444) Gyptis5.98e+18 ± 1.49e+1825 %Ephem 2019M1263.39 9

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 = (8.723 ± 4.281) × 1018 kg   (ΔM/M = 49%, SNR = 2.0) Derived bulk density ρ = (3.90 ± 1.99) g/cm3   (Δρ/ρ = 51%, SNR = 2.0)


References
M26(2001):Michalak, G., 2001. Determination of asteroid masses. II. (6) Hebe, (10) Hygiea, (15) Eunomia, (52) Europa, (88) Thisbe, (444) Typtis, (511) Davida and (704) Interamnia. Astronomy and Astrophysics 374, 703–711.
M42(2004):Kochetova, O.M., 2004. Determination of Large Asteroid Masses by the Dynamical Method. Solar System Research 38, 66–75.
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.
M123(2014):Goffin, E., 2014. Astrometric asteroid masses: a simultaneous determination. Astronomy & Astrophysics, Volume 565, id.A56, 8 pp.
M126(2019):Fienga, A., et. al, 2019. INPOP19a planetary ephemeris. Notes Scientifiques et Techniques de l'Institut de mécanique céleste,