Hans-Emil Lau (16 April 1879 – 16 October 1918) was aDanishastronomer.
He started his observational career during his studies atCopenhagen University. After completing his degree in 1906 he worked at theUrania, theTreptow Observatory atBerlin, and finally atHorsholm Observatory inCopenhagen.
He is most famous for his work onMars andJupiter. He also worked onstarparallax, the measuring ofvariable stars, the color of stars, and the observation ofcomets,sunspots, and the rings ofSaturn.
He published speculative orbits of two trans-Neptunianplanets in 1900, which were never found.
He died prematurely at the age of 39 during the worldwide1918 flu pandemic.A crater on Mars was named in his honor.
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