Researching Seth Nicholson

In 1914, at the University of California's Lick Observatory, while observing the recently discovered Jupiter moon Pasiphaë, he discovered a new one, Sinope, whose orbit he computed for his Ph.D. thesis in 1915.

He spent his entire career at Mount Wilson Observatory, where he discovered three more Jovian moons: Lysithea and Carme in 1938, and Ananke in 1951. While at the Palomar Observatory in 1957, he discovered 1647 Menelaus, an asteroid near Jupiter. Other work included computing the orbits of several comets and also that of Pluto.

Sinope, Lysithea, Carme, and Ananke were simply designated as "Jupiter IX", "Jupiter X", "Jupiter XI", and "Jupiter XII". They were not given their present names until 1975. Nicholson himself declined to propose names.

At Mt. Wilson, his main assignment concerned solar activity and he produced for decades annual reports on sunspot activity. He also made a number of eclipse expeditions to measure the brightness and temperature of the Sun's corona.

In the early 1920s, he and Edison Pettit made the first systematic infrared observations of celestial objects.They used a vacuum thermocouple to measure the infrared radiation and thus the temperature of the Moon which led to the theory that the Moon was covered with a thin layer of dust acting as an insulator, and also of the planets, sunspots and stars.Their temperatures measurements of nearby giant stars led to some of the first determinations of stellar diameters.

Nicholson, together with astronomer George Ellery Hale, lend their name to the "Hale-Nicholson law" concerning the magnetic polarity of sunspots.

From 1943 to 1955, he served as editor of the Publications of the Astronomical Society of the Pacific, of which he was also twice president.

He died in Los Angeles. His final resting place is in dispute, but he was cremated and his remains were likely dispersed by his son.