By Thomas R. Williams
Based in 1911, the AAVSO boasts over 1200 contributors and observers and is the world's biggest non-profit association devoted to variable superstar statement. This well timed booklet marks the AAVSO's centennial 12 months, offering an authoritative and actual historical past of this crucial organization. Writing in an interesting and obtainable type, the authors stream chronologically via 5 eras of the AAVSO, discussing the evolution of its constitution and objective. in the course of the textual content, the main target is at the hundreds of thousands of people whose contributions have made the AAVSO's growth attainable. Describing a century of interplay among novice astronomers, the authors rejoice the collaborative relationships that experience existed through the years. because the definitive background of the 1st hundred years of the AAVSO, this article has huge charm and may be of curiosity to novice astronomers, in addition to historians and sociologists of technology regularly.
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Extra resources for Advancing Variable Star Astronomy: The Centennial History of the American Association of Variable Star Observers
68 In 1911, after publishing several technical articles in Popular Astronomy, Leonard advertised the SPA to the broader audience of Popular Astronomy readers and invited others to join. Although the society consisted primarily of amateur astronomers, Leonard welcomed professionals. The society’s journal was now printed and distributed as the Monthly Register of the SPA. The officers of the SPA were Frederick C. Leonard, president; John E. Mellish, secretary; Horace C. Levinson, treasurer; and Ruel W.
He repeated much of what he published in his 1891 pamphlet. ” Pickering acknowledged the usefulness of the Hagen series of charts and, following Hagen’s lead, offered photographically reproduced charts – also derived from the Durchmusterung – for 72 variable star fields. Pickering praised Hagen’s charts, but justified another, wider field series of charts for observing these same stars when they were brighter than ninth magnitude: Observations of nearly equal value [as those made by experienced observers] can be obtained by those unaccustomed to estimating intervals in grades.
50 When he prepared the fourth and subsequent series, Hagen included a column headed HP (Harvard Photometry) in the comparison star tables, which gave the photometric magnitudes as determined at HCO. In the case of the naked-eye stars of Series V, some comparison star magnitudes were taken instead from the Potsdam Photometric Durchmusterung, the Uranometria Argentina, or from magnitudes determined by A. W. 51 18 Pioneers in variable star astronomy prior to 1909 FRUITS OF COOPERATION The cooperation between amateurs and professionals was leading to a new era for variable star observers.
Advancing Variable Star Astronomy: The Centennial History of the American Association of Variable Star Observers by Thomas R. Williams