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Pleiades
(2013-01-18 21:40)


About this Object

In astronomy, the Pleiades, or Seven Sisters, is also known as Messier object M45. It is an open star cluster containing middle-aged hot B-type stars located in the constellation of Taurus. It is among the nearest star clusters to Earth and is the cluster most obvious to the naked eye in the night sky. Computer simulations have shown that the Pleiades was probably formed from a compact configuration that resembled the Orion Nebula. Astronomers estimate that the cluster will survive for about another 250 million years, after which it will disperse due to gravitational interactions with its galactic neighborhood.

About this Image

An unguided exposure on one of my first nights out with the EOS 60Da, about two weeks after I acquired the camera. At first viewing I was only able to see the stars, and I could not detect any nebulosity. After processing the image in RegiStax and PhotoShop many months later, some nebulosity appeared, underscoring the power of processing. More images and longer exposures would have brought out more of the whispy nebulosity.


--- Date/Time ---
Local: 2013-01-18 21:40:00
UTC: 2013-01-19 02:40:00

--- Location ---
The Ashton Observatory at Johnson Farms, Ashton MD
(Latitude N39.15°, Longitude W77.01°, Elevation 510')

--- Conditions ---
Good seeing

--- Optics ---
Televue NP101is 101mm f/5.35 Refractor

--- Camera ---
Canon EOS 60Da, 120mm

--- Exposure ---
Qty 5 30-second ISO 800

--- Post-Processing ---
RegiStax, PhotoShop



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