Archive for June 2013

Gamma Virgo – “Porimma” – Famous Double Star

June 15, 2013

By Debbie Ivester

This is one of my first telescopic observations of a double star. I was using a 102 mm Orion/Vixen refractor at a magnification of 196x.  Conditions were only fair, but I could make out two individual stars of the same magnitude on an intermittent basis.  Both stars appear white in color.  When observing double stars, it’s important to keep your eye very still, and look into the center of the eyepiece…referred to as, “on-axis.”    Debbie  Ivester

photo

 Gamma Virgo has always been one of my favorite doubles.  It is a true binary with a 170-year period.  I began observing double and multiple stars many years ago.  The current separation of Gamma is 2″ and was very easy with the 102 mm refractor at a magnification of 169x. I made the following pencil sketch on May 13th from my backyard in the foothills of western North Carolina.  Conditions were fair, and only during moments of steady viewing could I see dark-sky between the pair, most of the time they were merging or “notched.”  The following sketch was made with a No.2 pencil and a blank 5 x 8 note card.  The colors were inverted using a scanner.  

Roger Ivester 

Gamma Virgo - Correct Position Angle

Please click on the following link to see the Las Vegas Astronomical Society Observers Challenge…

MAY 2013 OBSERVERS CHALLENGE – PORRIMA

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Globular Cluster M13 and The Elusive Propeller – Orion Telescope and Binoculars Article – Posted: June 5th 2013

June 5, 2013

M13 is one of the most popular deep-sky objects in the night sky, but few have seen the three dark lanes, known as the propeller.

Please share if you can see this most interesting feature during your next deep-sky observing session.

Please click on the following link at Orion Telescope and Binoculars:

http://www.telescope.com/Globular-Cluster-M13-and-the-Elusive-Propeller/p/102978.uts