5475 Hanskennedy

This asteroid is named for Hans Kennedy, who was born in 1924 in Amsterdam in the Netherlands. After five years in India and New Zealand as an engineer, he left Christchurch in 1962 for Sydney. Initially working at the division of Astronomy and Physics at the CSIRO, he developed a multi-exposure technique to observe potential flare stars, using a scanning densitometer. He selected contact binaries as his primary area of research and recorded period changes of 24 contact binaries. He investigated the effect of using an incorrect ephemeris to determine times of minimum light and analysed the nature of abrupt period changes, concluding that they are non-existent. He indicated that periods of broken contact must be of limited duration due to the formation of a gas stream between the binary components and demonstrated that asymmetric minima are caused by dark magnetic spots. Despite criticism, he predicted the existence of large equal-mass binaries which were discovered in 2007. He developed a technique to observe the light from faint binaries during minimum light when they become invisible at visible wavelengths, using an integrator.

Hans Kennedy was also instrumental in the discovery of the atmosphere of Pluto and was requested by NASA to photographically track several Apollo missions. He participated in photo-electric observations of the asteroid Kleopatra and found that it is an elongated metallic object consisting of an alloy of iron and nickel.

Kennedy was a close associate of Gerald Kron (US Naval Observatory)and Bart Bok (University of Arizona). He produced over 32 papers and publications. Although retired, he is analysing Schmidt plates and involved in research of binaries.

• Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
• Dictionary of Minor Planet Names, Google books
• Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
• Discovery Circumstances: Numbered Minor Planets (5001)-(10000) – Minor Planet Center
• 5475 Hanskennedy at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 5475 Hanskennedy at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters