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View Full Version : Hubble's Variable Nebula February 19, 2012



RickJ
2012-Dec-30, 09:56 PM
I've been following this nebula for several years now. I've since learned it can vary in only a few days but so far I've only followed it yearly. Weather last winter prevented me from getting enough data to do a series to see the short term changes. In fact I couldn't even get more than one round of color data for this image.

My seeing varies so much some of the differences seen are due to seeing but most are due to different parts of the cloud being illuminated. Besides this years image I've included a three year image showing the changes from 2010 through 2012. The 2010 image was taken with my old color filters so some of the added red might be due to that though the drop in red continues into 2012. Since star colors are quite consistent I have to believe most of the change is real. Certainly the luminance changes are real. The change from 2010 to 2011 was more dramatic than that from 2011 to 2012 but changes there were. It appears some of the darker areas in 2011 brightened in 2012 reducing contrast in the brighter regions. A feature on the eastern side somewhat seen in 2010 but gone in 2011 has returned stronger than in 2010. Changes around the illuminating star are also quite evident in 2012. Over all it appears "fatter" in 2012 than the two prior years. If the weather permits I'll try and get at least one image per month to see if faster changes are seen. So far the weather has been so bad I've not had a chance to get any data on it this winter. I hope that will change.

Data for 2012
14" LX200R @ f/10, L=5x10' RGB=1x10', STL-11000XM, Paramount ME.

Rick

MaryCar
2012-Dec-30, 10:05 PM
Thanks for the info ;)