Deep Sky Astronomy & Telescopes

Glimpsing Our Solar System’s Future

December 12, 2016

The star L2 Puppis (HD 56096), a red giant in the direction of the southern constellation Puppis (the Poop Deck), is the subject of interesting new investigations using data from the ALMA array in Chile. The star appears to belong on the asymptotic giant branch of the Hertzsprung-Russell diagram, a category dominated by highly evolved […]

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Thought Experiment: The Asteroid Belt Astronomical Telescope

December 5, 2016

Could laser light be used to shape and polish an asteroid to high optical standards? That’s the question raised in an imaginative essay in Physics Today that posits the creation, a century from now, of the Asteroid Belt Astronomical Telescope (ABAT). It’s science fiction today, part of the series of speculations that the magazine has […]

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Fast Radio Bursts as Cosmological Probes

November 17, 2016

One of the brightest Fast Radio Bursts seen since the phenomena were first detected in 2001 has been observed by the Parkes radio telescope in New South Wales. Maybe it should come as no surprise that Parkes was involved, given that most of the 18 FRBs that have so far been detected have been found […]

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Into the ‘Brown Dwarf Desert’

November 11, 2016

A newly discovered brown dwarf dubbed OGLE-2015-BLG-1319 is significant on several fronts, not the least of which is how it was found. Not only are we dealing here with another instance of gravitational microlensing, where the light of a background star is affected by a foreground object in ways that give us information about the […]

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A Dazzling Galactic Encounter

November 4, 2016

Sometimes deep sky objects are so striking that I have no choice but to write about them, even if they weren’t on the agenda for today. 114 million light years from Earth in the direction of Canis Major we see an interacting pair of galaxies. Michele Kaufman (Ohio State University) and colleagues have found arcs […]

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Cosmology: Shelter from the Storm

October 14, 2016

I had thought while the power was out this past week that I would like to write about cosmology when it came back. That’s because there’s nothing like a prolonged power outage to adjust your perspective. The big picture beckons. In my case, it was thinking about how trivial being out of power was compared […]

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Looking at Gaia’s Sky

September 15, 2016

The European Space Agency’s Gaia satellite has delivered a catalog of more than a billion stars — 1142 million, to be more specific — as it continues the work of mapping our galaxy in three dimensions. To be sure, we can expect much more from Gaia, but the September 14 data release is a milestone, […]

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Brown Dwarf Analysis Offers Exoplanet Implications

August 16, 2016

Brown dwarfs offer exciting prospects for exoplanet work. Not only are we learning that they can have planets of their own, but brown dwarfs themselves are a useful bridge between planets and stars. We also know that there are a lot of them out there. According to data from the WISE (Wide-field Infrared Survey Explorer) […]

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KIC 8462852: Fading in the Kepler Data

August 5, 2016

Those of you who have been following the controversy over the dimming of KIC 8462852 (Tabby’s Star) may remember an interesting note at the end of Bradley Schaefer’s last post on Centauri Dreams. Schaefer (Louisiana State University) had gone through his reasoning for finding a long-term dimming of the star in the DASCH (Digital Access […]

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An Unusual Pulsating Binary

July 29, 2016

A large part of the fascination of astronomy is the discovery of objects that don’t fit our standard definitions. KIC 8462852 — ‘Tabby’s Star’ — is deeply mysterious and high on my watchlist. But yesterday we also looked at CX330, a so-called FUor of the kind that brightens enormously over years of observation. Today we […]

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