NGC 2264 and S Monocerotis
AAO image reference AAT 14
Top left is NE. Image width is about 40 arc min
Image and text © Anglo-Australian Observatory, Photograph by David Malin.
The region around the 4.7 magnitude star S Mon is a fascinating mixture of red fluorescent hydrogen and dark, obscuring dust lanes. Some dust patches are close enough to bright stars to reflect light from them; these appear blue for the same reason that the day-time sky is blue - because some of the interstellar particles preferentially scatter blue light. Some of the wispy tendrils of nebulosity are Herbig-Haro objects, jets of matter ejected from newly-formed stars still hidden within the nebula. About 250 stars have been recognised as members of NGC 2264 which is at a distance of about 2700 light years.
Entry from NGC 2000.0 (R.W. Sinnott, Ed.) © Sky Publishing Corporation, 1988:
NGC 2264 C+N 06 41.1 +09 53 s Mon 60. 3.9 eL neb, 3deg diam, densest 12' sp 15 Mon |
置顶卡
变色卡
千斤顶
显身卡