You are correct that these nebulae were discovered by Annie Cannon from objective prism surveys with the 24" in Peru. They were published (in the case of Cn 2-1) in a paper by Harlow Shapley in the...
Good comment, I tried to keep it consistent to make the blue mag with a "b" and if truly visual with a "v". Otherwise nothing. I take whatever the source give.
In my many decades of observing,...
My only record of this object is through my 25x100 binoculars from Anza Borrego desert California, although I have seen it at least once in 2005 or 2006 with my then 8" f/8 telescope.
"Beautiful!...
I looked up some of the group with an alternate name and it appears the listed mag might be a mix between the blue mag and visual depending on the object
Hi Alvin,
I envy your dark skies but will try and see how it goes on a couple of the brighter and well placed group for me at 40 degrees north. Are the brightest member magnitudes listed the...
These are some of my notes through a variety of apertures. The sites and observing conditions also varied significantly.
48": at 375x; highly resolved cluster with chains of brighter stars,...