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All sourcesNASA NTRSDOE OSTI
DOE OSTI2018

Materials Data on LuRe2 by Materials Project

LuRe2 is Hexagonal Laves structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Lu is bonded in a 12-coordinate geometry to twelve Re atoms. There are a spread of Lu–Re bond distances ranging from 3.12–3.16 Å. There are two inequivalent Re sites. In the first Re site, Re is bonded to six equivalent Lu and six equivalent Re atoms to form a mixture of face, edge, and corner-sharing ReLu6Re6 cuboctahedra. All Re–Re bond lengths are 2.71 Å. In the second Re site, Re is bonded to six equivalent Lu and six Re atoms to form a mixture of face, edge, and corner-sharing ReLu6Re6 cuboctahedra. There are two shorter (2.61 Å) and two longer (2.78 Å) Re–Re bond lengths.

36 MATERIALS SCIENCE↗
NASA NTRS1977

Three-dimensional determination of the center of the Watts datum relative to the lunar center of mass

The location of the origin of the Watts datum for the marginal zone of the moon is determined using results of 2770 photoelectric occultation observations obtained over an 18-yr period in combination with 1787 laser time-delay measurements carried out over a five-year period. The lunar ephemeris employed is an experimental one developed from a much shorter span of laser observations. The final solution is obtained by adopting LURE2 parameters and correcting 19 lunar orbital, solar orbital, and coordinate-system parameters. The offsets for the center of the Watts datum are found to be approximately +6.8 km for x1, -2.5 km for x2, and +0.06 km for x3 with respect to the lunar principal axes of inertia.

Mulholland, J. D.↗