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The Cat's Eye Nebula (also known as NGC 6543 and Caldwell 6) is a planetary nebula in the northern constellation of Draco, discovered by William Herschel on February 15, 1786. It was the first planetary nebula whose spectrum was investigated by the English amateur astronomer William Huggins , demonstrating that planetary nebulae were gaseous ...
Messier 94 (also known as NGC 4736, Cat's Eye Galaxy, Crocodile Eye Galaxy, or Croc's Eye Galaxy [7] [8]) is a spiral galaxy in the mid-northern constellation Canes Venatici. It was discovered by Pierre Méchain in 1781, [ 9 ] and catalogued by Charles Messier two days later.
Cat's Eye Nebula: NGC 6543: 1786 3.3 ± 0.9 9.8B Draco: Little Ghost Nebula: NGC 6369: 1800 (prior to) 2 ± 3 ... magnitude (visual) [a] Constellation [a] Glowing Eye ...
Iris Nebula: Open Cluster and Nebula: 1.4 Cepheus: 7 C5 IC 342: Hidden Galaxy [7] Spiral Galaxy: 10,000 Camelopardalis: 9 C6 NGC 6543: Cat's Eye Nebula: Planetary Nebula: 3 Draco: 9 C7 NGC 2403 Spiral Galaxy: 14,000 Camelopardalis: 8.4 C8 NGC 559 Open Cluster: 3.7 Cassiopeia: 9.5 C9 Sh2-155: Cave Nebula: Nebula: 2.8 Cepheus: 7.7 C10 NGC 663 ...
Cat's Paw Nebula Supernova remnant: Scorpius: 17 h 19 m 58.0 s: −35° 57′ 47″ 6340: Spiral galaxy: Draco: 17 h 10 m 25.1 s +72° 18′ 17″ 11.9 6341: Messier 92 Globular cluster: Hercules: 17 h 17 m 07.3 s +43° 08′ 12″ 6.3 6357: War and Peace Nebula Diffuse nebula: Scorpius: 17 h 24 m: −34° 20′ 6369: Little Ghost Nebula ...
Daily increase in volume of the Cat's Eye Nebula [16] 4 × 10 43: Annual increase in volume of the Cat's Eye Nebula [16] [17] 1 × 10 45: One cubic petametre ~1.7 × 10 45: Approximate volume of the Stingray Nebula [18] ~2.7 × 10 46: Volume of the bright inner nebula of the Cat's Eye Nebula [16] 5.5 × 10 46: The volume of a Bok globule like ...
The Helix Nebula (also known as NGC 7293 or Caldwell 63) is a planetary nebula (PN) located in the constellation Aquarius. Discovered by Karl Ludwig Harding , most likely before 1824, this object is one of the closest of all the bright planetary nebulae to Earth. [ 3 ]
On August 29, 1864, Huggins was the first to analyze the spectrum of a planetary nebula when he observed Cat's Eye Nebula. [10] His observations of stars had shown that their spectra consisted of a continuum of radiation with many dark lines superimposed.