IC 4406
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| Planetary nebula | Lists of nebulae |
|---|---|
 HST view of IC 4406 |
|
| Observation data (Epoch J2000) |
|
| Right ascension | 14h 22m 26.278s[1] |
| Declination | -44° 09′ 04.35″[1] |
| Distance | 2.0 kly (600 pc)[2] |
| Apparent magnitude (V) | |
| Apparent dimensions (V) | 30″[citation needed] |
| Constellation | Lupus |
| Physical characteristics | |
| Radius | 0.13 × 0.45 ly[citation needed] |
| Absolute magnitude (V) | -0.3 |
| Notable features | - |
| Other 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.
[edit] 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]
[edit] References
- ^ a b SIMBAD Astronomical Database. Results for IC 4406. Retrieved on December 19, 2006.
- ^ a b c d e O'dell, C. R.; Balick, B.; Hajian, A. R.; Henney, W. J.; Burkert, A. (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.
- ^ 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.
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