April/avril 2013 Volume/volume 107 Number/numéro 2 [759] Inside this issue: Lemaître’s Limit Space Race Moon Loops and Dumbbells Historic Telescopic Observation 227-Year-Old Error Meteoritical Society The Journal of The Royal Astronomical Society of Canada Le Journal de la Société royale d’astronomie du Canada PROMOTING ASTRONOMY IN CANADA The King’s Crown and the Crown Jewels
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April/avril 2013
Volume/volume 107
Number/numéro 2 [759]
Inside this issue:
Lemaître’s Limit
Space Race
Moon Loops and Dumbbells
Historic Telescopic Observation
227-Year-Old Error
Meteoritical Society
The Journal of The Royal Astronomical Society of Canada
Le Journal de la Société royale d’astronomie du Canada
P R O M O T I N G A S T R O N O M Y I N C A N A D A
The King’s Crown and the Crown Jewels
53 April / avril 2013 JRASC | Promoting Astronomy in Canada
63 Two Astronomers and the Space Race by Chris Gainor
65 Moon Loops and Dumbbells—The Most Curious Moon of All
by Richard J. Legault
70 A Chance to Recreate a Historic Telescopic Observation
by Clark Muir
72 Rectifying a 227-Year-Old Error: Stellar-remnant Nebulae
by Michael Harwood
76 Peter Millman and the Revitalization of the Meteoritical Society
by Howard Plotkin
Columns / Rubriques
82 Second Light: A New Way to Measure Black-hole Masses
by Leslie J. Sage
83 Cosmic Contemplations: The Untold Secrets of Making Your Own Monochrome DSLR
by Jim Chung
87 Through My Eyepiece: Music of the Spheres by Geoff Gaherty
89 Rising Stars: Nutwood Observatory: Where the Elk, Wild Birds, and Astronomers Roam
by John Crossen
90 Astronomical Art and Artifact: The Prehistory of the Society’s Seal
by R.A. Rosenfeld
Departments / Départements
54 News Notes/En manchettes compiled by Andrew Oakes
– Radio telescope to rise in British Columbia – Increasing number of planetary candidates discovered – Comets had no role in wipeout of prehistoric humans – Scientific cross-field collaborations show results and point
to more questions – Top-ten science highlights from Cassini for 2012 – Astronomers discover large asteroid belt around Vega
69 Great Images: Lunar Crater Janssen by Mike Wirths
74 Pen & Pixel
M94 / NGC 891 / Jupiter and Ganymede / Helix Nebula by Kerry-Ann Lecky Hepburn / Andre Paquette / David Jenkins / Dalton Wilson
95 The 2013 General Assembly of the RASC
96 Astrocryptic Answers by Curt Nason
96 Society News by James Edgar
96 It’s Not All Sirius—Cartoon by Ted Dunphy
Front cover — Seven nights of imaging gave Howard Trottier this beautiful image of the reflection nebula NGC 7129 and the open cluster
NGC 7142. Howard describes the pair, respectively, as the “King’s Crown” and the “Crown Jewels.” Exposure, in LRGB, totalled 12½ hours
using a PlaneWave CDK17 telescope and an Apogee U16M camera.