The Helix Ne bula (also known as NGC 7293 or Caldwell 6) is a planetary nebula (PN) in the constellation Aquarius. The Helix Nebula (also known as NGC 7293 or Caldwell 6) is a planetary nebula (PN) in the constellation Aquarius. Wikipedia The Helix Nebula (also known as NGC 7293 or Caldwell 6) is a planetary nebula (PN) in the constellation Aquarius. The Helix Nebula (also known as NGC 7293 or Caldwell 6) is a planetary nebula (PN) in the constellation Aquarius.
The text of the lithograph explains the appearance of the Helix Nebula and gives general information about the formation of planetary nebulae. There are about 40 000 comet nodes in the Helix Nebula. The Helix Nebula (NGC 729) is a bright, large planetary nebula located 650 light years from Earth in the constellation Aquarius.
How to calculate NGC 7293?
The models used for the Napiwotzki (199) survey were calculated in full NLTE, but contained only the two most abundant elements, hydrogen and helium. In the case of DeHt 5 (as well as Abell 31 and NGC 729), two-gyro guiding9 forced us to use the less than satisfactory distribution of parallax factors shown in Table 2. The models used for the Napiwotzki (199) survey were calculated in full NLTE, but only considered the two most abundant elements, hydrogen and helium. In the case of DeHt 5 (as well as Abell 31 and NGC 729), two-gyro guiding9 forced us to use the unsatisfactory distribution of parallax factors shown in Table 2.We present absolute parallaxes and relative proper motions for the central stars of the planetary nebulae NGC 6853 (The Dumbbell), NGC 7293 (The Helix), Abell 31 and DeHt 5. The models used for the Napiwotzki (199) survey were calculated in full NLTE, but included only the two most abundant elements, hydrogen and helium. In the case of DeHt 5 (as well as Abell 31 and NGC 729), two-gyro guiding9 forced us to produce the less than satisfactory distribution of parallax factors shown in Table 2.We present absolute parallaxes and relative proper motions for the central stars of the planetary nebulae NGC 6853 (The Dumbbell), NGC 7293 (The Helix), Abell 31, and DeHt 5.Detailed theoretical calculations have predicted the spectra of the best observed nebulae quite successfully.
However, the problems associated with the PN nebula of NGC 6853 discussed in this paper also involved the DDO photometry of the reference frame of NGC 7293.
Why is it called the Helix Nebula?
The unique appearance of the Helix Nebula has earned it the nicknames The Eye of God and The Eye of Sauron in pop culture. It is also known by the catalogue number NGC 7293 and is a typical example of a class of objects called planetary nebulae. Discovered by Karl Ludwig Harding in the early 19th century, Helix is one of the closest bright planetary nebulae ever. Planetary nebulaAll planetary nebulae form at the end of the life of an intermediate-mass star, about 1-8 solar masses.
A combined infrared and ultraviolet image of the Helix Nebula from NASA’s Spitzer Space Telescope and Galaxy Evolution Explorer (GALEX).
Where is the closest nebula to Earth?
The Helix Nebula (also known as NGC 729) is the closest planetary nebula to Earth, at a distance of about 700 light years. Although it is one of the brightest planetary nebulae in the sky, its light is spread over a large area, so it can only be seen in exceptionally clear and dark skies. When these outer layers are repelled by the intense heat of the core, they form what is known as a planetary nebula, visible as a shell of glowing gas around a very hot central star. However, with the help of binoculars or a telescope, you should be able to spot more of Orion’s distinctive features, including the bright central part of the nebula, the Huygen region (named after the 17th century astronomer Christiaan Huygens).
The main ring has an extension of about two light-years, and the nebula’s material spreads at least two light-years further.
