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Starobserver
member
Reged: 06/04/09
Posts: 20
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Observing report Regulus
In the 12-inch Dobson, even at the lowest magnification alpha Leonis is easily split, and can only be described as stunningly beautiful. In the 35mm Panoptic the extremely bright Regulus (alpha Leonis A) dominates the field of view with its sparkling appearance. The four large diffraction spikes amplify this effect dramatically. To the northwest I can see the fainter companion of Regulus, alpha Leonis B. It has a soft yellow colour.
In the 22mm Nagler, alpha Leonis looks at its best. This eyepiece, yielding a magnification of 72x and a field of view of 68', is also used for sketching Regulus.
Alpha Leonis is a wide double, separated by a few arc minutes. There is a large difference in magnitude between Regulus and its companion, at least 5 or 6 magnitudes, maybe even more. I do not see any other remarkable stars in the field of view, just some faint field stars. I see no nebulosity or glow of unresolved stars. Besides the yellow alpha Leonis B, I do not see stars that show any hint of colour. I tried all possible magnifications, even stopped down the telescope to 5.5 inches (off axis). This way I tried to see if the colour of Regulus maybe would shift a little to a more bluish tint, but despite all my experimenting, Regulus kept its bright white colour.
For more recent research and very interesting facts about Regulus please follow this link.
Enjoy!
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Clear Skies!
Math
Starobserver
http://www.backyard-astro.com/blog
http://www.starobserver.eu
Edited by Starobserver (10/18/09 10:16 AM)
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JayinUT
I'm not Sleepy
Reged: 09/19/08
Posts: 933
Loc: Utah
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Math,
Wonderful capture of this pair! Nicely done.
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Jay in Utah
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Location: Lat: 40.514N Long: -112.032W
Mortal as I am, I know that I am born for a day. But when I follow at my pleasure the serried multitude of the stars in their circular course, my feet no longer touch the earth.
— Ptolemy, c.150 AD
My Blog
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Jef De Wit
super member
Reged: 03/06/09
Posts: 120
Loc: Hove, Belgium
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Math, beautiful sketch. I never tried to draw a double, but your sketch makes me think "why not trying once...".
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Clear skies, Jef De Wit
7x50 bino, Meade ETX-70 & Orion Optics UK 12" Dobson
"Bright skies aren't empty skies" (James Mallaney)
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frank5817
Post Laureate
Reged: 06/13/06
Posts: 4082
Loc: Illinois
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Math,
Looks great. You obviously work with much attention to details.
 
Frank 
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my gallery
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JayKSC
scholastic sledgehammer
Reged: 01/01/05
Posts: 973
Loc: Florida
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Beautiful sketch, Math. The way you've illustrated Regulus, it almost feels that it is threatening to overpower my vision and obscure its golden double. Capturing bright stars in sketch work has always been a challenge to me. I'm liking this method of rendering bright stars as opposed to my present technique of drawing them as larger than the surrounding stars.
- Jay
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Refractor manic. 
My Sketches
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