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Hubble's variable nebula in Monoceros
Hubble's Variable Nebula (NGC 2261) is a small 2 x 4 arcminute nebula found in the constellation Monoceros. One suggestion proposed for the observed variability is due to dust clouds near R Monocerotis periodically changing the nebula's illumination. The image was a total of 6 hr 20 min exposure with a 12.5” f/9 RCOS telescope and SBIG STF8300c camera (OAG with ST-i) on a Paramount ME (19 x 1200 sec lights @-15o C; 30 darks; 128 bias; 128 flats); Software: Sky X, MaxIm DL6, PixInsight 1.8.4.1195.
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