Summary for : 19P/Borrely
| 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 |
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| COM | - | - | - | - | - | 0.05 ± 0.04 (X) | 82 % | 4.8 ± 0.4 | 8.3 % | 2.70e+12 ± 2.10e+12 | 78 % | S | EVM |
| COM | - | - | - | - | - | 0.05 ± 0.04 (X) | 82 % | 4.8 ± 0.4 | 8.3 % | 2.70e+12 ± 2.10e+12 | 78 % | S | w.avg |
| COM | - | 0.12 ± 0.09 (X) | 75 % | 4.8 ± 0.4 | 8.3 % | 2.70e+12 ± 2.10e+12 | 78 % | 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)
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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)
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(Indirect) density estimates
| Density (g/cm^3) | Δρ/ρ | Method | Year | Ref | N |
|---|
| 0.24 ± 0.06 | 25.0 % | CNGF | 2004 | BD4 | |
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CNGF : Non-gravitational forces (comets).
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References
| BD4 | (2004): | Davidsson, B.J.R., Gutierrez, P.J., 2004. Estimating the nucleus density of Comet 19P/Borrelly. Icarus 168, 392-408. |
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Diameter estimates
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).
FlyBy : Images from spacecraft encounter.
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EVM diam. average D = (4.8 ± 0.40) km (ΔD/D = 8%, SNR = 12.00)
Derived bulk density ρ = (0.05 ± 0.04) g/cm3 (Δρ/ρ = 82%, SNR = 1.2)
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References
| D56 | (2009): | Sosa, A., Fernández, J.A., 2009. Cometary masses derived from nongravitational forces. Monthly Notices of the Royal Astronomical Society 393, 192–214. |
Mass estimates
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).
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EVM mass average M = (2.700 ± 2.100) × 1012 kg (ΔM/M = 78%, SNR = 1.3)
Derived bulk density ρ = (0.05 ± 0.04) g/cm3 (Δρ/ρ = 82%, SNR = 1.2)
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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. |
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