Looks like the corolla of a flower or a radio-telescope dish, but instead has been nicknamed Fox Fur nebula after the furry appearance of its core.
Processing was particularly complex because of imperfect stars due to bad guiding of my Star Adventurer GTI Mount. This mount has given me problems since the beginning, and today it went through a radical mechanical RA and Dec backlash tuning, that I reckon was the problem since ever. If it still not working properly, well... it will go from astrobin to trash bin.

The Monoceros Flower (Fox Fur Nebula) Sh2-273
The Fox Fur nebula Sh2-273 is ionized primarily by the O7V binary star S Mon. The famous Cone nebula appears south of S Mon and its surrounding star cluster NGC 2264.
A more detailed image of the area surrounding Barnard 39 (north west of center) is available here.

NGC2261
The reflection nebula NGC2261, often called Hubble's Variable Nebula, is found south of NGC2264. The famous US astronomer Edwin Hubble reported that this nebula appeared to change its shape in a series of photographs taken over 8 years. It is now known that these changes are actually caused by variations in the variable star R Mon, which illuminates the nebula. R Mon is a very active class B0 Herbig star with a thick accretion disk, jet outflows and an orbiting companion star. It appears to be located at about the same distance as the Mon OB1 molecular clouds.

Mon OB1
Despite the huge 14° x 5 ° extent of Mon OB1 as defined by Ruprecht, Humphreys' 1978 paper lists only one ionising member - the O7V binary star S Mon (HD 47839). Her updated 1984 catalog adds the O9 class HD 45314 (discussed in the commentary on the Orion (200° - 190°) sector to the west) and 4 B-class stars (HD 47961, HD 48717, HD 44637 and HD 46883).
A detailed study of S Mon, the binary central star of the star cluster NGC 2264, derived a spectral type of O9.5V for its secondary star, with an orbital period of 9247 ± 64 days (a bit over 25 years), 35 and 24 solar masses respectively for the primary and secondary star, and a distance of 950 pc.
Both S Mon and HD 47961 are part of NGC 2264 which is commonly described as the "Christmas tree cluster". She gives a distance of 660 pc and an age of 6.4 million years for the cluster.
There is a distance estimate of 800 pc for Sh 2-273, the nebula ionised by NGC 2264. Sh 2-273 is often called the Fox Fur nebula because of the mottled appearance of the nebula near the central cluster.
Sh 2-273 also contains the famous Cone nebula, a pillar of gas and dust containing the infrared source [MRC90] IRS E (V591 Mon, T Tauri Star)  embedded in a Bok globule at its tip. The infrared source IRAS 06384+0932 (Allen's source, NGC 2264 IRS 1), which appears to be a hot B-class star about 3500 times more luminous than our Sun, is located just beyond the tip of the Cone nebula and may be creating a stellar wind that energises and shapes the nebula.

Close Supernova Remnants
Two remarkable supernova remnants lie to the south (east in the galactic plane) of the Mon OB1 molecular clouds: SNR 205.5+0.5 (the Monoceros Loop - the upper half of the loop is visible in the southern part of our image here) and the faint SNR 206.9+2.3 (AJG 5) that I already imaged here, and is just out of the field. One set of distance estimates suggests that the Monoceros loop is located along with Mon OB2 on the near side of the Perseus arm at about 1600 pc, but AJG 5 is much further away, 6900 pc, a distance usually associated with the Outer arm.

(info and text excerpted from galaxymap.org and simbad)