Waid Observatory

Object: Sh2-280

Date: Jan. 30 & 31, 2020   -  ; Location: Davis Mountains west of Ft Davis, TX
Telescope: 10 in. RC  Mount: Paramont MX   Camera: Apogee-8300F
Exposure: Ha and OIII = 360 min. each - (20 min. sub-exposures. bin 1X1)

Click on the image below to view at higher resolution.




Sh2-280, as listed in the Sharpless Catalog of HII regions, is located in the constellation Monoceros approximately 5,500 light years from the Earth.  It is a very near, about 2 degrees south, of the more famous Rosette Nebula.  Perhaps this is the reason it seems to be overlooked by many amateur astronomers.  It is, in my opinion, a remarkable celestial object with many interesting features.  According to research, the nebula is illuminated and ionized by the bright, type O7, star, HD 46573, located near the center of Sh2-280.  A feature I find interesting is the blue shock front located to the right of the star.  This structure stands out in the OIII filtered image.  I, however, have not found any literature, or research, describing this feature.

The image above was assembled using hydrogen alpha (Ha) and doubly ionized oxygen (OIII) filtered images. The Ha image was mapped to the Red channel and the OIII was mapped to the Green and Blue channels.  This method produces a near true color image that more closely portrays the natural color of the subject object.

A full Hubble Palette (SII,Ha,OIII) version of the image may be viewed here.


Copyright Donald P. Waid