IRAS 19475+3119

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IRAS 19475+3119
IRAS 19475+3119.jpg
IRAS 19474+3119
Observation data
Epoch J2000      Equinox J2000
Constellation Cygnus
Right ascension 19h 49m 29.5627s
Declination +31° 27′ 16.221″
Apparent magnitude (V) 9.52
Evolutionary stage Protoplanetary nebula
Spectral type F3Ib
Proper motion (μ) RA: -0.6 mas/yr
Dec.: -2.8 mas/yr
Other designations
HD 331319

IRAS 19475+3119 is a protoplanetary nebula in the constellation of Cygnus, 15,000 light-years away. An observation with the Hubble Space Telescope revealed a quadrupolar structure.[1]

The central star was originally 2.5 solar masses,[1] and is now 0.63 solar masses. The object is 8,300 times the luminosity of the sun and 4.9 kpc from the sun; its diameter is estimated to be 58 times that of the sun[2]


  1. ^ a b Raghvendra Sahai et al.: A Quadrupolar Preplanetary Nebula: IRAS 19475+3119, The Astrophysical Journal, Volume 658, Issue 1, pp. 410-422.
  2. ^ Ming-Chien Hsu, Chin-Fei Lee: An Envelope Disrupted by a Quadrupolar Outflow in the Pre-Planetary Nebula IRAS19475+3119, arXiv:1105.2410v1