NGC 7662

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Planetary Nebula
NGC 7662
Photo from the Hubble Space Telescope
Photo from the Hubble Space Telescope
AladinLite
Constellation Andromeda
Position
equinox : J2000.0
Right ascension 23h 25m 53.9s
declination + 42 ° 32 ′ 06 ″
Appearance
Apparent brightness  (visual) 8.3 mag 
Apparent brightness  (B-band) 9.2 likes 
Angular expansion 0.99 ′ × 0.71 ′  
Central star
designation HD 220733 
Physical data
Redshift 0.000714 ± 0.000123 
Radial velocity (+214 ± 37) km / s 
distance 1800 ly 
history
discovery William Herschel
Date of discovery October 6, 1784
Catalog names
 NGC  7662 •  PK  106-17.1 •  GC  4964 • CS = 13.2 • h 2241 • H IV 18

NGC 7662 is a planetary nebula with dimensions 0.99 '× 0.71' and an apparent magnitude of +8.3 mag in the constellation Andromeda . It is 5000–6000 light years away from the solar system and has an extension of about 50–60,000 astronomical units .
It is also called the blue snowball (fog) ; this nickname comes from the amateur astronomer Leland S. Copeland .

Its blue-green color, which gives it its name, comes from oxygen stimulated to glow . The very hot central star, a white dwarf with an approximate surface temperature of 75,000 Kelvin, is responsible for the glow . Its high-energy UV radiation ionizes the oxygen twice (O-III), so that the gas emits light at a wavelength of 5007 and 4959 Angstroms , which we perceive as blue-green.

NGC 7662 was discovered on October 6, 1784 by the German-British astronomer Wilhelm Herschel .

Web links

Commons : NGC 7662  - collection of images, videos, and audio files

Individual evidence

  1. ↑ a b c NASA / IPAC EXTRAGALACTIC DATABASE
  2. ↑ SEDS: NGC 7662
  3. ↑ SIMBAD Astronomical Database
  4. ↑ Seligman
  5. ↑ http://deepsky.astronomie.info/And/ngc7662/index.de.php