Category Archives: Sidereal Times

From The Astrophotography Group

Posted on January 3, 2026 by ST Editors

C/2025 A6 (Lemmon) taken by Daniel Opdyke Telescope:   Atrotech AT 72ED II 72mm aperture 430mm focal length f/6Mount:         Iopteron CEM 25 hypertunedExposures:   60 subframes @ 60 sec each over 1 nights for 1 hour of integration; ASI533MC-P; … Continue reading →

Posted in January 2026, Sidereal Times | Tagged , | Leave a comment

The Celestial Transients

Posted on January 3, 2026 by ST Editors

by S. Prasad Ganti A recent article in Scientific American about the Celestial transients piqued my mind. To quote “Transients are astronomically sized objects that change on human timescales—in seconds, hours, days. Transients, which are astronomical objects that appear suddenly … Continue reading →

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The Unchecked Growth of Orbital Debris

Posted on January 3, 2026 by ST Editors

by Abhinav Sukla I don’t think it would be wrong to label the current era as the early dawn of the space age. Hardly half a century has passed since the first rockets left our atmosphere. Even in the early … Continue reading →

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Impact of Relativity on the Hubble Equation

Posted on January 3, 2026 by ST Editors

by William H. Davis The Hubble equation  v=Ho/dv= H_o/d is commonly used to estimate distances to distant objects emitting light. The observations by a number of astronomers, even before Hubble, recognized a relationship between velocity and distance of nearby objects. … Continue reading →

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Snippets

Posted on January 3, 2026 by ST Editors

compiled by Arlene & David Kaplan Did Astronomers See a Star Explode Twice? Astronomers may have spotted their first superkilonova — a star that’s exploded not once, but twice. When massive stars die, they detonate in a celestial fireworks display known as … Continue reading →

Posted in January 2026, Sidereal Times | Tagged , | Leave a comment

From The Director

Posted on December 2, 2025 by ST Editors

by Rex Parker, PhD director@princetonastronomy.org December 9, 2025 Meeting at Peyton Hall.  December’s winds whirl over the ivy-covered gothic spires and gleaming contemporary towers on the Princeton University campus, where we’ll meet for our final session of the calendar year … Continue reading →

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From The Program Chair

Posted on December 2, 2025 by ST Editors

by Victor Davis, Program Chair The Universe in a ComputerThe December, 2025 meeting of the AAAP will take place in Peyton Hall on the campus of Princeton University on Tuesday, December 9th at 7:30 PM. As usual, the meeting is … Continue reading →

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Observatory Report

Posted on December 2, 2025 by ST Editors

by Dave and Jennifer Skitt, Observatory Co-Chairs Solar Observing on November 29, 2025 Upon hearing of the Grand Re-Opening of the Nature Center in Washington Crossing State Park on Thanksgiving weekend, I wondered what AAAP could do to entice park … Continue reading →

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From The Astrophotography Group

Posted on December 2, 2025 by ST Editors

by Michael DiMario, Astrophotography Chair Bubble Nebula NGC7635 taken by Michael DiMarioTelescope:       Celestron C9.25 Edge HD at FL 1645mm f7.0Mount:             Losmandy GM811GExposures:       229 subframes @ 300 sec each over 5 nights for 19 hours of integration; ASI2600MC-P; Optolong L-Ultimate filterProcessing … Continue reading →

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The Perfect Machine

Posted on December 2, 2025 by ST Editors

by S. Prasad Ganti “The Perfect Machine” is the name of a book written by Ronald Florence. It covers the design, construction and the installation of the 200 inch Hale telescope at the Mount Palomar observatory, close to San Diego … Continue reading →

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