SNR G206.9+2.3 in Monoceros

Last new moon I had a chance to start an attempt on the SNR G206.9+2.3 in Monoceros.

The object is a relative unknown SNR and lies in a triangle east of the Cone-Nebula and Rosette-Nebula around the mag 7 stars HD 49711 and HD 49367. The center of the 0.9°x0.6° large SNR is located around RA: 6h 49.0', DEC: +06° 20.4'. It should not be mistaken with the much larger Monoceros-Loop SNR directly W of this SNR.

Without expecting to see anything, I was surprised to see the main arches without difficulties at all. Brightest part was the southern arch.

I nice picture was made by Daniel Pölzl.

At least, I wish all the best for the new year to you.

sketch: 27", 172x, [OIII], NELM 6m5+, Seeing III
Attachment 4150
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1018x1440 version

Hello Uwe,

this is an amazing sketch!

Thank you for having chosen this SNR,
and with the best wishes for the New Year,
Jiri

After an unsuccessful attempt a year ago I gave it another try this week under better conditions with my 20" Dobsonian at 256x magnification with O-III filter.

At first, I tried the southern arc, which is the brightest one on photos. Starting at a sharp triangle of 10-11 mag stars, I was able to see a long, small and curved arc with averted vision. Moving back and forth along this arc was a lot of fun! I observed Sh2-224 the weekend before, but the southern arc of SNR G206.9+2.3 actually was easier.

Then I also saw another filament on the eastern to south-eastern side, which was fainter, and a shorter filament on the northern side, which was the most difficult one. Additionally, I tried an arc on the western side, but was unsuccessful there.

Please find attached my sketch.

Clear skies,

Robin

Like Robin, I was encouraged to go after this supernova remnant thanks to Uwe posting his drawing. I observed it twice this winter and both times I looked for it in my 16-inch using 105x and an O-III filter. And each time, I came away with the impression that there was a phantom-like line that would come and go as my eye passed over it. It also seemed to get brighter towards the west -- right at a little Aries-shaped star pattern of three faint stars. The first night I saw that, I thought I was just seeing the glow of the three stars. But by closely studying the attached image, I could see that the O III emissions just happen to get more intense right there. It was a tough observation for me, but after having the same thing happen to me twice, I'm confident I saw it. I'd catch a surprisingly strong glow right at that triangle that would slowly fade to the east.

Scott H.

Attachment 5060
Image Credit: Daniel Pölzl