Water lily nebula

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Water lily nebula
Observational Data
Designation IRAS 16594-4656
PN G340.3-03.2
Right ascension 17h 03m 10.07s[1]
Declination -47° 00′ 27.74″[1]
Constellation Ara
Type of object Protoplanetary nebula
Distance from Earth 12,035 ly[2]
Proper motion RA: 0.155 mas/yr<refname=simbad/>
Dec.: 1.882 mas/yr[1]
Parallax 0.8828±0.1962 mas[1]

The Water lily nebula (IRAS 16594-4656, PN G340.3-03.2) is a protoplanetary nebula in the constellation of Ara.[3] It is one of a number of such nebulae where complex organic molecules have been discovered that possess aliphatic or aromatic structures. Unsurprisingly, the nebula is rich in carbon.[4] The nebula has a core/bipolar structure.

The nebula is thought to lie 12,035 light years from Earth.[2]


  1. 1.0 1.1 1.2 1.3 Water Lily Nebula from the SIMBAD Astronomical Database
  2. 2.0 2.1 Vickers, S., Frew, D., Parker, Q. and Bojičić, I. (2014). New light on Galactic post-asymptotic giant branch stars – I. First distance catalogue. Monthly Notices of the Royal Astronomical Society, 447(2), pp.1673-1691. arXiv:1403.7230 [astro-ph.SR]
  3. Complex Organic Molecules Form Quickly In Old Stars. Retrieved on 2018-10-04.
  4. Lagadec, E. et Al. (2011). A mid-infrared imaging catalogue of post-asymptotic giant branch stars. Monthly Notices of the Royal Astronomical Society, 417(1), pp.32-92. arXiv:1102.4561 [astro-ph.SR]