Cat's Ee Nebula

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Cat's Ee Nebula
Nebula
NGC6543.jpg
Composite image uisin optical images frae the HST an X-ray data frae the Chandra X-ray Observatory
Observation data: J2000 epoch
Richt ascension 17h 58m 33.423s[1]
Declination +66° 37′ 59.52″[1]
Distance 3.3±0.9 kly (1.0±0.3 kpc)[2] ly
Apparent magnitude (V) 9.8B[1]
Apparent dimensions (V) Core: 20″[2]
Constellation Draco
Physical characteristics
Radius Core: 0.2 ly[note 1] ly
Absolute magnitude (V) −0.2+0.8
−0.6
B[note 2]
Notable featurs complex structur
Designations NGC 6543,[1] Snail Nebula,[1] Sunflower Nebula,[1] (includes IC 4677),[1] Caldwell 6
See also: Leets o nebulae

Coordinates: Sky map 17h 58m 33.423s, +66° 37′ 59.52″ The Cat's Ee Nebula or NGC 6543, is a relatively bricht planetary nebula in the northren constellation o Draco, which wis discovered bi William Herschel on Februar 15, 1786.

Notes[eedit | eedit soorce]

  1. Distance × sin(diameter_angle / 2 ) = 0.2 ly. radius
  2. 9.8B apparent magnitude – 5×{log(1.0 ± 0.3 kpc distance) − 1} = −0.2+0.8
    −0.6
    B absolute magnitude

References[eedit | eedit soorce]