Summary for : 22P/Kopff

DynT.TT.BT T.L B T.DDensity (g/cm^3)Δρ/ρDiameter (km)ΔD/DMass (kg)ΔM/MRefAvg.M
COM--- | --0.22 ± 0.12   (D)53 %3.6 ± 0.411.1 %5.30e+12 ± 2.20e+1242 %SEVM
COM--- | --0.22 ± 0.12   (D)53 %3.6 ± 0.411.1 %5.30e+12 ± 2.20e+1242 %Sw.avg
COM-0.21 ± 0.11   (D)52 %3.6 ± 0.411.1 %5.30e+12 ± 2.20e+1242 %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:

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
22P/Kopff3.59 ± 0.4011.1 % H-mag2006D32 0.00 1

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).

H-mag : Crude estimate from absolute magnitude.


EVM diam. average D = (3.6 ± 0.40) km   (ΔD/D = 11%, SNR = 8.98) Derived bulk density ρ = (0.22 ± 0.12) g/cm3   (Δρ/ρ = 53%, SNR = 1.9)


References
D32(2006):Tancredi, G., Fernández, J.A., Rickman, H., Licandro, J., 2006. Nuclear magnitudes and the size distribution of Jupiter family comets. Icarus 182, 527–549.

Mass estimates

DesignationMass / Err (kg)ΔM/MMethodYearRefNχ2Use
22P/Kopff5.30e+12 ± 2.20e+1242 %CNGF 2009M850.00 1

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).

CNGF : Non-gravitational forces (comets).


EVM mass average M = (5.300 ± 2.200) × 1012 kg   (ΔM/M = 42%, SNR = 2.4) Derived bulk density ρ = (0.22 ± 0.12) g/cm3   (Δρ/ρ = 53%, SNR = 1.9)


References
M85(2009):Sosa, A., Fernández, J.A., 2009. Cometary masses derived from nongravitational forces. Monthly Notices of the Royal Astronomical Society 393, 192–214.