NGC 2237
Object Information:

NGC 2237 - The Rosette Nebula

Object Type - Emission nebula (NGC 2237) with open cluster (NGC 2244)

Constellation - Monoceros

The Rosette Nebula is a large emission nebula located in the constellation of Monoceros. The brighter portions of the Rosette have been assigned different NGC numbers: 2237, 2238, 2239, and 2246.

The cluster of stars at the center of the Rosette, collectively known as NGC 2244, are super-hot O-type stars which provide the ultraviolet radiation which causes the gas of the nebula to glow. It is believed that the radiation pressure from the stars of NGC 2244, which formed from the nebula, is the cause of the central hole. Astronomers also believe that the central stars formed less than 1 million years ago and that the intense stellar wind from these stars is presently dissipating the nebula.

The Rosette Nebula is believed to be 5,500 light years distant with an estimated diameter of 130 light years.

This image was taken with a hydrogen alpha filter which blocks light except in the hydrogen alpha emission wavelength.

Here is a cropped and enlarged view of the central portion of the Rosette Nebula which includes the open cluster NGC 2244.

NGC 2237

Follow this link for a higher resolution image of the wide field shot.

Follow this link to a higher resolution image of the close-up view.

Image date:

January 22-23, 2018

Exposure Information:

90 x 240 seconds --> 6 hours

Imaged at:

Vista, San Diego County, California


Stellarvue SV70T With 0.8x reducer, ZWO ASI1600MM-C, Baader 7 nm hydrogen alpha filter