Archived from: http://www.blackskies.org/gjjc_m22_2.htm


[GJJC 1] [M22]

The Super Challenging Planetary Nebula GJJC1 In Globular Cluster M22

On this page, I present a series of images that should allow an observer to zero in on the exact location of the planetary nebula GJJC1. The first Finder Aid is a sky chart from Megastar, Version 4, showing the location of M22 in the constellation Sagittarius. This is followed by a series of increasingly smaller scale images of M22 and the location of the planetary.

Location of M22 Within Sagittarius (18h 36.4m, -23d 54m)

[Megastar Finder Chart for M22]

[GJJC1 Finder Image 1]

This image shows the overall view of M22 and in general the location of GJJC1. The Reference Star FC1 (arbitrarily chosen) can be a starting point for star hopping to the area of the PNe, but it is also used as a reference on the next image so that we don't lose our bearings. All of the images have North at the top and East to the left.

[GJJC1 Finder Image 2] [GJJC1 Finder Image 3]

Image2 (left) and Image3 (right). The reference star V8 on Image2 is a check point for Image3, and a rough position is also shown for GJJC1. Now proceed to Image4 for the final location.

[GJJC1 Finder Image 4]

This image, showing the relative location between Star V8 and GJJC1 had to be rotated in order to bring North to the correct orientation. The image was included in the 1989 paper identifying this IR source as an unusual planetary nebula. It should be noted that the bright circle in the center of the ellipse is not an object - it just marks the center of the position uncertainty ellipse!

I have included one final image of GJJC1 which has been subjected to special processing which brings out the detail of the extremely faint nebulousity. It is an image which can also be found on the web site "Planetary Nebula Sampler", one of several sites placed on-line by George Jacoby, a co-author of the paper referenced on these pages.
This image has had a 'continuum' image subtracted from the OIII image to enhance the visibility of the emission-line nebula. The "dual headlight" white spots just to the left of center of the picture show the brightest parts of the nebula, but there are also faint wisps tailing away and downward.

[GJJC1 Showing Nebulosity Of PNe]

With the information and images presented on these two pages for GJJC1, it is hoped that some one will be successful in locating and identifying this extremely illusive planetary. Myself, Rich Jakiel, and several other observers would be very interested in getting feedback on any attempts, successful or NOT, to observe it.
In the event you are not interested or capable of observing the PNe, I certainly hope the information you have seen here has piqued your interest, and you will immediately go out and either buy or build a 30" telescope!
CLEAR SKIES & GOOD HUNTING!


I received an email report from Tom Polakis (Tempe, Arizona) letting me know that he was unsuccessful in visually observing this PN with his 13" scope in 1992 from Arizona. He suggests that it might be more suitable for southern sky observers when M22 reaches a higher altitude than for the majority of viewers here in the northern hemisphere. Probably so. Well, lets get those positive or negative reports sent in folks, wherever you do your observing.

Author: Doug Snyder


Hartmut Frommert
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