Cone nebula, Christmas Tree cluster, NGC 2264, The star 15Mon

The Cone Nebula is an H II region in the constellation of Monoceros. It was discovered by William Herschel on December 26, 1785, at which time he designated it H V.27. The nebula is located about 830 parsecs or 2,700 light-years away from Earth. The Cone Nebula forms part of the nebulosity surrounding the Christmas Tree Cluster. The designation of NGC 2264 in the New General Catalogue refers to both objects and not the nebula alone.

The diffuse Cone Nebula, so named because of its apparent shape, lies in the southern part of NGC 2264, the northern part being the magnitude-3.9 Christmas Tree Cluster. It is in the northern part of Monoceros, just north of the midpoint of a line from Procyon to Betelgeuse.

The cone’s shape comes from a dark absorption nebula consisting of cold molecular hydrogen and dust in front of a faint emission nebula containing hydrogen ionized by S Monocerotis, the brightest star of NGC 2264. The faint nebula is approximately seven light-years long (with an apparent length of 10 arcminutes), and is 2,700 light-years away from Earth.

Integration: 30.0 hours

Imaging telescopes or lenses: Takahashi TSA 102 and Vixen VSD
Imaging cameras: Starlight Express SXVR-H18
Mounts: Sky-Watcher NEQ6 Pro Paramount MX
Guiding telescopes or lenses: Takahashi TSA 102
Guiding cameras: sx loadstar
Focal reducers: Takahashi TOA/FS Reducer
Software: Sequence Generator Pro, PHD, Photoshop CS5
Filters: Baader Ha, & OIII
Accessories: Starlight Xpress USB filter wheel, Baader Planetarium 36mm narrowband filters

Cone nebula, Christmas Tree cluster, NGC 2264, The star 15Mon

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