The image is a 10 minute exposure with an SBIG ST-6 CCD camera
thru an Optical Guidance Systems 20 inch F/8.1 Ritchey-Chretien Cassegrain.
North is as top, and the field is about 5x7 arc minutes.
Click here to
see a large annotated version of this picture.
About l degree south of the Great
Orion Nebula lies the small reflection nebula NGC 1999. It enfolds the
10th magnitude variable star V380 Orionis. The star is nearly obscured
by a remarkable, sharply bounded dark patch. A few arc minutes farther
south is a fine example of Herbig-Haro objects, tiny nebulous blobs that
arise from jets of gas squirting in opposite directions from a star-forming
disk. The blobs light up where they strike surrounding gas
to see a larger version of our CCD image, which shows the Herbig-Haro objects,
which range from magnitude 18.5 to 21.5.
Description of NGC 1999 in The Deep Sky Field Guide to Uranometria 2000:
Bright roundish nebula; illuminating
star is V380 Ori (visual magnitude = 10.3).