Author: Andrew

An electrical engineer, amateur astronomer, and diver, living and working on the island of Hawaiʻi.

Unintended Photos 2

Yes, I meant to do that… Not.

Sometimes you download the SD card and find photos you had no idea you took, an accidental actuation of the shutter. Most of the time they totally worthless, a photo of blurred gravel, or a hand across the lens. But on occasion they are a bit more interesting, properly exposed and in focus…

Gauges
An accidental photo of my gauges early in the dive with plenty of air remaining.

Geminids and a Comet

Stayed up late tonight to check on a few things in the sky. Firstly the Geminid meteor shower, which is peaking nicely. At least 100ZHR and bright enough to be nicely visible, even against the light of a bright gibbous moon.

The second item I wanted to see was comet C/2014 Q2 Lovejoy, now climbing higher in the sky as it swings northwards. It is currently somewhat low in Puppis, but getting higher each night as it moves nearly due north against the constellations. Currently it is an easy binocular object at around 7th magnitude. A quick sweep with my 9×50’s picked it up without effort halfway between Adhara and Canopus.

It is forecast to reach around 5th magnitude over the next month. Peak magnitude should occur near the new year while the comet is in Lepus. We placed and quite bright, I will be arranging to get a few photos of this comet through the new year!

Scientists Accurately Quantify Dust Around Planets in Search for Life

W. M. Keck Observatory press release…

A new study from the Keck Interferometer, a former NASA project that combined the power of the twin W. M. Keck Observatory telescopes atop Mauna Kea, Hawaii, has brought exciting news to planet hunters. After surveying nearly 50 stars from 2008 to 2011, scientists have been able to determine with remarkable precision how much dust is around distant stars – a big step closer into finding planets than might harbor life. The discovery is being published in the Astrophysical Journal online, on December 8th.

A dusty planetary system (left) is compared to another system with little dust in this artist's conception. Credit NASA/JPL-Caltech
A dusty planetary system (left) is compared to another system with little dust in this artist’s conception. Credit NASA/JPL-Caltech
“This was really a mathematical tour de force,” said Peter Wizinowich, Interferometer Project Manager for Keck Observatory. “This team did something that we seldom see in terms of using all the available statistical techniques to evaluate the combined data set. They were able to dramatically reduce all the error bars, by a factor of 10, to really understand the amount of dust around these systems.”

The Keck Interferometer was built to seek out this dust, and to ultimately help select targets for future NASA Earth-like planet-finding missions.

Like planets, dust near a star is hard to see. Interferometry is a high-resolution imaging technique that can be used to block out a star’s light, making the region easier to observe. Light waves from the precise location of a star, collected separately by the twin 10-meter Keck Observatory telescopes, are combined and canceled out in a process called nulling.

“If you don’t turn off the star, you are blinded and can’t see dust or planets,” said co-author Rafael Millan-Gabet of NASA’s exoplanet Science Institute at the California Institute of Technology in Pasadena, California, who led the Keck Interferometer’s science operations system.

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