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The central star of the Helix Nebula is a white dwarf of spectral type DAO. [19] It has the designations WD 2226-210, PHL 287, and GJ 9785. [1] The star has a radius of 0.025 solar radii (17,000 km), a mass of 0.678 M ☉, a temperature of 120,000 Kelvin and has an apparent magnitude of 13.5. [19]
English: The Helix Nebula: a Gaseous Envelope Expelled By a Dying Star About the Object. Object Name: Helix Nebula, NGC 7293 or "The Eye of God" Object Description: Planetary Nebula; Position (J2000): R.A. 22h 29m 48.20s; Dec. -20° 49' 26.0" Constellation: Aquarius; Distance: About 690 light-years (213 parsecs)
In addition to Juno, he discovered three comets and the variable stars R Virginis, R Aquarii, R Serpentis and S Serpentis. [4] Furthermore, he found some new nebulae, [5] among them being the Helix Nebula or "the Eye of God". His main opus was the Atlas novus coelestis, the first star atlas without splendid but confusing mythological figures.
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Diffuse Nebula: The closest major star formation region to Earth. [49] Crab Nebula: 11 ly (3.4 pc) [50] Supernova remnant: The remnant of a supernova that occurred in 1054 AD. [51] Bubble Nebula: 6 [52]-10 [53] [54] ly (1.84-3.066 pc) Emission nebula: Helix Nebula: 5.74 ly (1.76 pc) [55] Emission nebula: Eightburst Nebula: 0.8 ly (0.2453 pc ...
Cat's Eye Nebula: NGC 6543: 1786 3.3 ± 0.9 9.8B Draco: Little Ghost Nebula: NGC 6369: 1800 (prior to) 2 ± 3 9.9 Ophiuchus: Medusa Nebula: Abell 21 1955 1.0 (approx.) 15.99 Gemini: Jewel Bug Nebula: NGC 7027: 1878 3.0 (approx.) 10 Cygnus: Helix Nebula: NGC 7293: 1824 0.68 +0.15 −0.08: 7.6 Aquarius: Little Dumbbell Nebula: M76: NGC 650, NGC ...
Compared to the Helix Nebula, another planetary nebula in Aquarius, it is quite small. [33] NGC 7293, also known as the Helix Nebula, is the closest planetary nebula to Earth at a distance of 650 light-years. It covers 0.25 square degrees, making it also the largest planetary nebula as seen from Earth.
The central star is a binary star consisting of an A-type subgiant and a subdwarf O star. [9] The system, which has an orbital period of 16.00 ± 0.03 days, [2] is also variable, [10] probably due to dust in orbit around it. The dust itself is heated by the central star and so NGC 2346 is unusually bright in the infrared part of the spectrum.