Red Spider Nebula

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Red Spider Nebula
Bipolar planetary nebula NGC 6537.jpg
Bipolar planetary nebula NGC 6537 taken with the New Technology Telescope at La Silla Observatory.[1]
Credit: ESO
Observation data
(Epoch J2000.0)
Right ascension 18h 05m 13.1s
Declination -19° 50′ 34.9″
Distance ~5000 ly[2]
Apparent magnitude (V) 13
Apparent dimensions (V) 1.5 arcmin
Constellation Sagittarius
Physical characteristics
Radius ?? ly
Absolute magnitude (V) -
Notable features hot white dwarf
Other designations NGC 6537
See also: Planetary nebula, Lists of nebulae

The Red Spider Nebula (also catalogued as NGC 6537) is a planetary nebula located in the constellation Sagittarius.[3] The nebula has a prominent two-lobed shape, possibly due to a binary companion or magnetic fields.

The central white dwarf, the remaining compact core of the original star, produces a powerful and hot (≈10,000 K) wind blowing with a speed of 300 kilometers per second, which has generated waves 100 billion kilometres high. These winds are what give this nebula its unique 'spider' shape and also contribute to the expansion of the nebula.[4]

The star at the center of the Red Spider Nebula is surrounded by a dust shell making its exact properties hard to determine. Its surface temperature is probably 150,000-250,000 K[2] although a temperature of 340,000 K or even 500,000 K is not ruled out, making it among the hottest white dwarf stars known.

The Red Spider Nebula lies toward the constellation of Sagittarius. Its distance has been variously estimated as 1900 light years[4][5] or, more likely, 3000-8000 light-years.[2]

References[edit]

  1. ^ "Bizarre Alignment of Planetary Nebulae". ESO Press Release. Retrieved 6 September 2013. 
  2. ^ a b c Matsuura, M. (October 2005). "The symmetric dust shell and the central star of the bipolar planetary nebula NGC 6537". Monthly Notices of the Royal Astronomical Society. Retrieved 9 July 2014. 
  3. ^ "Astronomy Picture of the Day". 29 October 2012. Retrieved 9 July 2014. 
  4. ^ a b "Red Spider Nebula (NGC 6537)". Encyclopedia of Science, The Worlds of David Darling. Retrieved 16 July 2014. 
  5. ^ "The Red Spider Nebula: Surfing in Sagittarius - not for the faint-hearted!". ESA/Hubble. 24 July 2001. Retrieved 16 July 2014. 

External links[edit]