SL 11 stands for Swedish
Astronomers Sandqvist & Lindroos who catalogued 42 Southern Dark
nebulas in 1976 (*). Dark nebulas of this type are high concentrated
dust and molecular gas that absorbs visible light coming form the
star background. This are some of the coldest and isolated places in
the Universe. Lupus provide some interesting patches of dark nebula.
In this case SL 11 is not so often photographed. The FOV also
includes bright star eta Lupi shining at magnitude 3.42 in the top /
left corner and some distant galaxies in the middle low part of the
image. PGC 170710; PGC 56360; PGC 56362 and at the right all alone
PGC 89000. Such galaxies are very faint and had a relative small
size put sill visible in better in the high resolution image.
