Summary for : 1P/Halley
| 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 | - | - | - | - | - | 0.54 ± 0.38 (D) | 69 % | 10.4 ± 2.0 | 19.2 % | 3.20e+14 ± 1.20e+14 | 38 % | S | EVM |
| COM | - | - | - | - | - | 0.54 ± 0.38 (D) | 69 % | 10.4 ± 2.0 | 19.2 % | 3.20e+14 ± 1.20e+14 | 38 % | S | w.avg |
| COM | - | 0.54 ± 0.37 (D) | 69 % | 10.4 ± 2.0 | 19.2 % | 3.20e+14 ± 1.20e+14 | 38 % | 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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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 = (10.4 ± 2.00) km (ΔD/D = 19%, SNR = 5.20)
Derived bulk density ρ = (0.54 ± 0.38) g/cm3 (Δρ/ρ = 69%, SNR = 1.5)
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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 = (3.200 ± 1.200) × 1014 kg (ΔM/M = 38%, SNR = 2.7)
Derived bulk density ρ = (0.54 ± 0.38) g/cm3 (Δρ/ρ = 69%, SNR = 1.5)
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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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