Monthly Archives: June 2012

Geometrical Optics and the Hastings-Byrne Refractor: Part III

Posted on June 4, 2012 by ST Editors

by John Church In the March and April issues I reviewed the relatively simple equations that allow a lens designer to specify the total curvatures of both elements of a two-element (crown and flint) achromatic refractor objective, and how our … Continue reading →

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Spectacular SpaceX Dragon Launch

Posted on June 4, 2012 by ST Editors

by Dr. Ken Kremer Following the spectacular May 22 nighttime blastoff of the SpaceX Falcon 9 rocket and the Dragon commercial resupply capsule, the successful docking at the International Space Station (ISS) and the safe splashdown on May 31, human … Continue reading →

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Snippets

Posted on June 4, 2012 by ST Editors

compiled by Bryan Hubbard Asteroid nudged by sunlight: Most precise measurement of Yarkovsky effect Published: Thursday, May 24, 2012 – 22:31 in Astronomy & Space Scientists on NASA’s asteroid sample return mission, Origins, Spectral Interpretation, Resource Identification, Security, Regolith Explorer … Continue reading →

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