IC 4406 is a bright planetary nebula near the western border of the constellation Lupus in a distance of 2000 light years. It has dust clouds and has the shape of a torus.
Despite this, it looks somewhat rectangular because it is seen from its side as viewed from Earth, almost in the plane of its equator.
IC 4406 is bipolar and appears to be a spheroid with strong concentrations of material in its equator. Some faint concentric shells are visible in outer parts.
Find an image taken by the Hubble Space Telescope here.
Ha-OIII-RGB (160-120-120-120-120 min each), North is down, Seeing 0.7-1 arc-sec
80cm f/7 Astrooptik Keller Hypergraph, FLI Proline 16803, Baader Filters, Prompt 7 CTIO Chile,
Acquisition: Philipp Keller, Konstantin Buchhold, Processing: Johannes Schedler
See the image below in 100/200% size below: