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Veil Nebula (NGC 6979) & Veil Nebula (NGC 6995)
Sharon Dhavale & Kellee Dragt

Helix Nebula Orion Nebula
Veil Nebula (NGC 6979) - Sharon Dhavale Veil Nebula (NGC 6995) - Kellee Dragt

Both the objects presented above are Nebulae. The term Nebula is used to describe various types of gas (such as hydrogen or helium), and dust located in interstellar space. There are a variety of different nebulae. Some common ones include, the Planetary and Emission Nebulae. Some specific and well-known nebulae are the Eagle, Ring, Crab, and Orion nebulae. Interestingly, the Ring Nebula is known to be the most widely observed nebula. With respect to formation, nebulae form due to remnant gas from a supernova (explosion of a star) or a Planetary nebula formation. From there, the various collisions and interactions between particles cause the object to become dense, turning it into an Emission nebula during star formation. Nebulae are vast in size and diameter. Nebulae are also known to be star-forming regions. One historically interesting fact about nebulae is that, once upon a time, large galaxies, such as Andromeda were referred to as nebulae. It was not until Edwin Hubble disproved this misconception by pointing out that, unlike Andromeda, nebulae were gas clouds inside the Milky Way.

Located in the visible portion of the Cygnus Loop constellation, the first object, NGC 6979, is a Veil Nebula, which is a large and complex supernova remnant. As mentioned above, this means that when a star explodes, this nebula is what remains after that explosion process. William Herschel, a German-British astronomer discovered the nebula on September 5, 1784. In terms of physical shape and size, this Veil Nebula a portion of a bigger object, which is separated into three main segments. The nebula that NGC 6979 is part of, is notoriously known for being spread out over a large area. Various estimations have been made regarding the distance of this large nebula. While these are not the only two sources, the traditional sources have estimated the distance of this nebula to be around 2500 light years away. However, recent research with instruments, such as Hubble Space Telescope has indicated a closer distance of 1,500 light years. While the former estimation is a traditional approach, the later estimation of 1,500 light years is the likely estimate.

The second image is the NGC 6995 Nebula, which is located in the southern part of the Eastern Veil Nebula. Interestingly, while the NGC 6979 makes up one segment of this overarching nebula, the NGC 6995 makes up another segment of the same overarching object. This Veil Nebula is also located in the Cygnus constellation and is the remnant of a supernova. According to the Encyclopedia Britannica, the supernova responsible for this nebula appears to have exploded about 10,000 years ago. The Veil Nebula lies about 1,500 light-years away from Earth. NGC 6995 is also considered to be one of the brighter areas of the vast nebula. Conclusively, William Herschel's son, John, discovered the nebula itself on September 7, 1825.

Both of the nebulae are part of the Cygnus constellation and they are both known as Veil Nebulae. The NGC 6995 and NGC 6979 are both approximately 1,500 light years away from Earth. Both of the nebulae make up two of the three main segments, which compose a large area in the stellar sky. The two nebulae presented here are two of three main segments of the same large, overarching object or Veil nebula.

As mentioned above, both the Nebulae are different segments of the same overall Veil Nebulae in the Cygnus constellation. Therefore, one of the biggest difference between the two is location. For instance, the NGC 6995 is located further south of the brightest area, NGC 6992.  In comparison, NGC 6979 is located in the Eastern region. Another difference is the brightness of the two nebulae. While both segments of the nebulae are generally bright, the later (NGC 6979) dims in comparison. Therefore, the NGC 6995 is brighter than the NGC 6979 nebula. This is perhaps because while nebulae are star forming regions, NGC 6995 is stronger region than NGC 6979. The final difference is NGC 6979 was discovered by William Herschel and NGC 6995 was discovered by his son, John Herschel.

References:
Gottlieb, Steve. "Dissecting the Veil Nebula." Dissecting the Veil Nebula. N.p., n.d. Web. 10 Dec. 2015.

"NGC 6979 | Astronomy." Encyclopedia Britannica Online. Encyclopedia Britannica, n.d. Web. 10 Dec. 2015.

"NGC 6995 | Astronomy." Encyclopedia Britannica Online. Encyclopedia Britannica, n.d. Web. 10 Dec. 2015.

"Veil Nebula (NGC 6960, NGC 6979, NGC 6992/5)." Veil Nebula (NGC 6960, NGC 6979, NGC 6992/5). Encyclopedia of Science, n.d. Web. 10 Dec. 2015.

"Veil Nebula." Wikipedia. Wikimedia Foundation, n.d. Web. 10 Dec. 2015.

Waid, Donald P. "NGC 6995 - The Veil Nebula." NGC 6995 - The Veil Nebula. Waid Observatory, n.d. Web. 10 Dec. 2015.

 

Object Veil Nebula (NGC 6979) Veil Nebula (NGC 6995)
Right Ascension (J2000) 20:56:24 20:57:01
Declination (J2000) +31:43:00 +31:12:59
Filters used B (Blue), C (Clear), R (Red), V (Green) B (Blue), C (Clear), R (Red), V (Green)
Exposure time per filter B (180s x 2), V (240s), and R (240s); C (180s x 2)

B (180s x 2), V (180s), and R (240s); C (180s x2)

Image dimension 716x571 pixels; 15.51x12.37 arcminutes

785x509 pixels; 17.01x11.03 arcminutes

Date/time observed October 10, 2015 2:35:30 UT October 14, 2015, 11:39:56 UT

 

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