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Jon Greif

Location of Photo:

CAnza Borrego State Park, Borrego Springs,, CA, USA

Date/Time of photo:

January 4-6, 2022 10 pm - 1 am PST


Astrotech AT72EDII 72 mm refractor, ZWO ASI533 MC pro imaging camera, ZWO 30 mm guide scope, ZWO ASI291MM mini guide camera, Rainbow Astro RST-135 mount, Ekos capture software on a Raspberry Pi 4B computer and Pixinsight 1.8.8 processing software on a Macbook Pro computer.


The beautiful Rosette Nebula, aka NGC 2237/2238/2239 and 2246, lies about 5,200 light-years from Earth in the constellation Monoceros the Unicorn, and is about 130 light-years across. It is an emission nebula, meaning that the gases (mainly hydrogen) that compose it glow as they are energized by radiation from local stars. The young stars in the nebula’s center are gravitationally bound to each other; they are an open cluster (NGC 2244) formed together from the material of the nebula.