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NGC 2264 is a rich and dynamic star-forming region in the constellation Monoceros, best known for the striking combination of the Cone Nebula and the Christmas Tree Cluster. Located about 2,500 light-years away, this complex showcases both the birth of stars and the sculpting power of stellar radiation.
The Cone Nebula appears as a dark, triangular pillar of cold gas and dust, silhouetted against the glowing red emission of surrounding hydrogen. This dense column is being eroded by intense ultraviolet light from nearby young, massive stars, a process that gradually shapes and disperses the nebula while potentially triggering new star formation within its depths.
Embedded within the same region is the Christmas Tree Cluster (NGC 2264 proper), a young open cluster whose stars trace a distinctive, tree-like pattern. Bright, blue-white stars form the “branches,” while reddish nebular glow and scattered dust give the cluster a festive, ornamented appearance. At the top of the tree lies the bright star S Monocerotis, whose energetic radiation illuminates and influences the surrounding nebula.
Together, the Cone Nebula and Christmas Tree Cluster offer a vivid portrait of stellar youth—a place where gravity, radiation, and time are actively shaping the next generation of stars.
Technical Details
Telescope: Sky-Watcher Esprit 100ED Refractor
Auto Focus: ZWO Electronic Auto Focuser
Astronomy Camera: ZWO ASI183MC Pro
Filter: Antlia ALP-T Dual Narrowband Ha/Oiii Filter; 180 exposures @ 5 minutes each (15 hours)
Total Integration Time: 15 hours
Auto Guiding: William Optics Uniguide 50mm Guide Scope
Auto Guiding Camera: ZWO ASI120MM Mini Guide Camera
Auto Guiding Software: PHD2
Telescope Mount: Celestron CGX Equatorial Mount
Telescope Computer: BeeLink GK-55 Mini PC / Windows 10 Pro
Wireless Communication: GL-iNEt Beryl Travel Router
Telescope Control & Image Capture Software: Nighttime Imaging ‘N’ Astronomy (N.I.N.A.)
Image Integration Software: Astro Pixel Process, by Aries Productions
Image Post Processing Software: PixInsight, by Pleiades Astrophoto
Images captured: Palm Springs, CA during February 2022. Dark sky classification = Bright suburban sky (Bortle 6)