Statistics – Computation
Scientific paper
Nov 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...187..707k&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 187, no. 1-2, Nov. 1987, p. 707-711.
Statistics
Computation
32
Background Radiation, Comet Tails, Cosmic Dust, Halley'S Comet, Stellar Spectra, Computational Astrophysics, Solar Flux, Vega Project
Scientific paper
Optical properties of cometary dust exhibit no substantial variations at distances from 100 to 15,000 km from the nucleus. Dust ejection can be approximated by cos φ where φ is the angle with the sun-nucleus axis. Phase functions of dust scattering at 10 wavelengths from 328 nm to 1.4 μm are obtained and discussed. Dust reflectivity is nearly constant in the range 0.3 μm to 1.8 μm. Vega-2 in situ measurements are analysed and compared with optical data. Phase functions calculated for Mie and Fresnel spheres fail to reproduce adequately the obtained data. More promising seems to be the approximation of rough spheres. Dust density was evaluated as 0.3 g cm-3 from comparison of the in situ data with the authors' measurements. Dust velocities are approximated by the expression Vg/Vd = 1+(ρr/b)1/2 with b = 4 g μm cm-3 obtained in the measurements. Total dust production rates equals 10 ton s-1 and Qd/Qg ≈ 0.3 on 1986 March 9.
Krasnopol'Skii V. A.
Krys'ko A. A.
Moreels Guy
Moroz Vasiliy Ivanovich
Tkachuk Yu. A.
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