Monthly Archives: March 2020

The Rosette Nebula, registred under the number Calwell 49, is an H-II region in the constellation Unicorn. As it is not a very well-known or easily identifiable constellation, so we start from Orion to locate it. It is east of Orion, in the extension of the line formed by Meissa (Lambda Orionis) and Betelgeuse. There are several entries from the NGC catalog:

• NGC 2237: the western part
• NGC 2238: another part of the nebula
• NGC 2244 (= NGC 2239): the cluster open in the center
• NGC 2246: another Rosette emission region

112 x 1 min
Camera : Nikon Z6 partially unfiltered
Telescope : Takahashi FSQ-106ED refractor.
Mount : Takahashi EM-200 homemade electronics.
Guiding : ZWO ASI290MM Mini on QHY OAG-M
Temperature : 2°C
Humidity : 68%
SQM : 21
Software : auto-guiding with PHD2, acquisition with Astro Photography Tool, processing with PixInsight.
Location : Le Plan, Col du Banchet