IC 4406
| Nebula | |
|---|---|
 HST view of IC 4406 | |
| Observation data: J2000 epoch | |
| Right ascension | 14h 22m 26.278s[1] |
| Declination | −44° 09′ 04.35″[1] |
| Distance | 2.0 kly (600 pc)[2] ly |
| Apparent dimensions (V) | 30″[citation needed] |
| Constellation | Lupus |
| Physical characteristics | |
| Radius | 0.13 × 0.45 ly[citation needed] ly |
| Absolute magnitude (V) | -0.3 |
| Notable features | - |
| Designations | Retina Nebula[3] |
IC 4406 is a planetary nebula near the western border of the constellation Lupus, the Wolf. 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[2] of its equator.
Structure
IC 4406 is bipolar and appears to be a prolate spheroid with strong concentrations of material in its equator.[3] This kind of structure is a natural product of a bipolar model.[3] The knots of IC 4406 have a "lacy" appearance and have no ordered symmetry towards the central star.[2] The knots have no tails.[2] None of the features have bright edges.[2]
See also
![[icon]](/wiki/File:Wiki_letter_w_cropped.svg){kind=small} | This section is empty. You can help by adding to it. (January 2015) |
References
- ^ a b "SIMBAD Astronomical Database". Results for IC 4406. Retrieved 2006-12-19.
- ^ a b c d e O'dell, C. R.; Balick, B.; Hajian, A. R.; Henney, W. J.; Burkert, A.; Balick; Hajian; Henney; Burkert (2003). "Knots in Planetary Nebulae". Winds, Bubbles, and Explosions: a conference to honor John Dyson, Pátzcuaro, Michoacán, México, September 9–13, 2002 (Eds. S. J. Arthur & W. J. Henney) Revista Mexicana de Astronomía y Astrofísica (Serie de Conferencias) (http://www.astroscu.unam.mx/~rmaa/). 15: 29–33. Bibcode:2003RMxAC..15...29O.
{{cite journal}}: External link in|journal= - ^ a b c O'Dell, C. R.; Balick, B.; Hajian, A. R.; Henney, W. J.; Burkert, A. (2002). "Knots in Nearby Planetary Nebulae". The Astronomical Journal. 123 (6): 3329–3347. Bibcode:2002AJ....123.3329O. doi:10.1086/340726.
{{cite journal}}: CS1 maint: multiple names: authors list (link)
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