|
PNe Observations
Hi Smirnoff & All,
Good to read your descriptions of these interesting PNe -- thanks for taking the time to post so we can all read 'em.
Yep, IC 4191 is a rather nasty proposition from the point of view of its stellar-nature. Blinking, as you wrote is really the only option. Other than the exercise of finding/identifying the little blighter, there isn't that much to the view.
Very interested in your description of NGC 5189 -- which is really quite similar to my impressions back in 1998 with 25cm:
x181 17' TF. Mag 9.9 Size 100". A thoroughly amazing object, certainly the most interesting PNe in the southern sky. Very difficult object to describe adequately because the structure is so complex. Without the UHC filter it appears within a diamond shaped asterim of *s mags 10-12 about 5' x 2.5' in PA 20. With the UHC filter it is involved with the W most of these *s. Generally irregular in structure, kind of like a barred spiral eg which has a very strong bar and weak stubby arms and an extended halo all round. The bar is in PA 30, about 1.5-2' long, it is slightly curved, concave to the SE, and that flank is slightly generally a little brighter than it's counterpart and a little better defined. This bar is irregular in brightness and mottled. The brightest and broadest area is about the SSW end. Generally narrower in the NE and dimer. This bar seems to eminate from a point just E of the W most member of the diamond of *s I have described, and leads toward the N most member. At the NE end the bar has a bright "nob" at the end and then curls off in the direction of SE -PA 140 and terminates. At the SSW end there is a little extension that is less bright than the other end and curls away to head off generally W. A very large roughly round, slightly elong in PA 30 halo encircles the object with much lower S.B haze out to a diameter of perhaps 2-2.5'. The central areas are decidedly bluish without the filter and no central * is visible.
Have you taken a look at Musca's "forgotten" PNe NGC 4071 ??
And yep, I agree The Ghost of Jupiter (NGC 3242) is one of the most intensely coloured PNe in the sky.
Enjoyed your report !!
Best,
Les D
|