I had an old image of this that was only 8 minutes of data that I thought needed an update with a new image. The rain and clouds parted for one night a couple of days ago, so I thought I would capture a lot more data and see what there was to see. Alas, the seeing wasn't great with 2.5+ arc second stars rather than the 1.5+ second stars I usually have when I decide to go after small planetary nebula. Despite this, I thought the seeing was good enough to significantly improve my results over my old image. Here is the result. There is always an option for a sharper round three image when the seeing is better!

The new image shows some interesting structures in the spray of purple and magenta emission over the background of the blue-green and green of the H-beta and OIII line emissions of the bright oval background of the nebula. I suppose the purple and magenta color is a mix of red H-alpha , blue-green H-beta and the blue H-gamma emission lines.

So, here are some vital statistics on the nebula. I measure it in my image 53 arc seconds in diameter. Gaia DR2 parallax data for the 16th magnitude progenitor star at the center of the planetary nebula is 0.628 milliarc seconds (with less than a 10% error), so the distance to the center of the nebula is about 1000/0.628 = 1592 parsecs. Given this distance, the nebula itself is about 1.33 light years across. This is just a but larger than M57 (1.1 light years in diameter). Despite being "smaller", M57 still looks over half again as large to us as IC 289 because M57 is much closer to us (787 parsecs.)

There is an odd little bonus object in the field. At roughly the center of the left upper quadrant of the image is a very dim, intensely blue star. There is good data in the Gaia catalogue on this object, with only about a 13.5% in the parallax data: 1000 / 2.6104 milliarc seconds = about 383 parsecs away. The Gaia G filter magnitude is 19.2491, and given the distance, this translates to an absolute magnitude of around 11.33. This is therefore an inherently dim object for such a hot blue object, so almost certainly is a fairly young hot white dwarf. I went hunting in the Gaia WD candidate catalog released in 2019, and sure enough its been included. In the catalog they estimate its surface temperature is either around 16,000K if it has a Helium dominated atmosphere or a 18,000K if it has a hydrogen dominated atmosphere. Pretty toasty either way! (To determine which kind of atmosphere, H or He, the WD possesses requires spectral data to be captured, but the Gaia mission only captures three photometric data points through UV-Blue, very broad 320nm-1000nm G filter and a Red-IR filter. See Gaia filters at: https://www.cosmos.esa.int/web/gaia/iow_20180316)

Each of the 13 images stacked for this final image was a live-stack of 320 x 1.5 second exposures. Live-stacking was done in SharpCap.